From 0fc9f9d3e741629987afd2370069485bca640396 Mon Sep 17 00:00:00 2001
From: Jan Provaznik <jprovaznik@gitlab.com>
Date: Tue, 13 Nov 2018 08:27:31 +0100
Subject: [PATCH] Add version 4.2 to all existing migrations

DB schema generated by a migration may look different in
rails 4 and 5 (because rails 5 may use different default values).
For this reason it's important to explicitly set for which rails
version a migration was written for.

See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912
---
 db/migrate/20140313092127_init_schema.rb                    | 2 +-
 db/migrate/20140407135544_fix_namespaces.rb                 | 2 +-
 ...31055_change_state_to_allow_empty_merge_request_diffs.rb | 2 +-
 db/migrate/20140416074002_add_index_on_iid.rb               | 2 +-
 db/migrate/20140416185734_index_on_current_sign_in_at.rb    | 2 +-
 db/migrate/20140428105831_add_notes_index_updated_at.rb     | 2 +-
 db/migrate/20140502115131_add_repo_size_to_db.rb            | 2 +-
 db/migrate/20140502125220_migrate_repo_size.rb              | 2 +-
 db/migrate/20140611135229_add_position_to_merge_request.rb  | 2 +-
 db/migrate/20140625115202_create_users_star_projects.rb     | 2 +-
 db/migrate/20140729134820_create_labels.rb                  | 2 +-
 db/migrate/20140729140420_create_label_links.rb             | 2 +-
 db/migrate/20140729145339_migrate_project_tags.rb           | 2 +-
 db/migrate/20140729152420_migrate_taggable_labels.rb        | 2 +-
 db/migrate/20140730111702_add_index_to_labels.rb            | 2 +-
 db/migrate/20140903115954_migrate_to_new_shell.rb           | 2 +-
 db/migrate/20140907220153_serialize_service_properties.rb   | 2 +-
 db/migrate/20140914113604_add_members_table.rb              | 2 +-
 db/migrate/20140914145549_migrate_to_new_members_model.rb   | 2 +-
 db/migrate/20140914173417_remove_old_member_tables.rb       | 2 +-
 db/migrate/20141006143943_move_slack_service_to_webhook.rb  | 2 +-
 .../20141007100818_add_visibility_level_to_snippet.rb       | 2 +-
 db/migrate/20141118150935_add_audit_event.rb                | 2 +-
 db/migrate/20141121133009_add_timestamps_to_members.rb      | 2 +-
 db/migrate/20141121161704_add_identity_table.rb             | 2 +-
 ...26120926_add_merge_request_rebase_enabled_to_projects.rb | 2 +-
 db/migrate/20141205134006_add_locked_at_to_merge_request.rb | 2 +-
 db/migrate/20141216155758_create_doorkeeper_tables.rb       | 2 +-
 db/migrate/20141217125223_add_owner_to_application.rb       | 2 +-
 .../20141223135007_add_import_data_to_project_table.rb      | 2 +-
 ...6080412_add_developers_can_push_to_protected_branches.rb | 2 +-
 db/migrate/20150108073740_create_application_settings.rb    | 2 +-
 ...0116234544_add_home_page_url_for_application_settings.rb | 2 +-
 .../20150116234545_add_gitlab_access_token_to_user.rb       | 2 +-
 .../20150125163100_add_default_branch_protection_setting.rb | 2 +-
 db/migrate/20150205211843_add_timestamps_to_identities.rb   | 2 +-
 db/migrate/20150206181414_add_index_to_created_at.rb        | 2 +-
 db/migrate/20150206222854_add_notification_email_to_user.rb | 2 +-
 db/migrate/20150209222013_add_missing_index.rb              | 2 +-
 db/migrate/20150211172122_add_template_to_service.rb        | 2 +-
 .../20150211174341_allow_null_in_services_project_id.rb     | 2 +-
 ...3_add_twitter_sharing_enabled_to_application_settings.rb | 2 +-
 db/migrate/20150213114800_add_hide_no_password_to_user.rb   | 2 +-
 ...20150213121042_add_password_automatically_set_to_user.rb | 2 +-
 ...7123345_add_bitbucket_access_token_and_secret_to_user.rb | 2 +-
 db/migrate/20150219004514_add_events_to_services.rb         | 2 +-
 db/migrate/20150223022001_set_missing_last_activity_at.rb   | 2 +-
 db/migrate/20150225065047_add_note_events_to_services.rb    | 2 +-
 ..._restricted_visibility_levels_to_application_settings.rb | 2 +-
 db/migrate/20150306023106_fix_namespace_duplication.rb      | 2 +-
 db/migrate/20150306023112_add_unique_index_to_namespace.rb  | 2 +-
 ...50310194358_add_version_check_to_application_settings.rb | 2 +-
 db/migrate/20150313012111_create_subscriptions_table.rb     | 2 +-
 db/migrate/20150320234437_add_location_to_user.rb           | 2 +-
 .../20150324155957_set_incorrect_assignee_id_to_null.rb     | 2 +-
 db/migrate/20150327122227_add_public_to_key.rb              | 2 +-
 db/migrate/20150327150017_add_import_data_to_project.rb     | 2 +-
 db/migrate/20150327223628_add_devise_two_factor_to_users.rb | 2 +-
 ...32231_add_max_attachment_size_to_application_settings.rb | 2 +-
 ...50331183602_add_devise_two_factor_backupable_to_users.rb | 2 +-
 db/migrate/20150406133311_add_invite_data_to_member.rb      | 2 +-
 db/migrate/20150411000035_fix_identities.rb                 | 2 +-
 db/migrate/20150411180045_rename_buildbox_service.rb        | 2 +-
 db/migrate/20150413192223_add_public_email_to_users.rb      | 2 +-
 db/migrate/20150417121913_create_project_import_data.rb     | 2 +-
 .../20150417122318_remove_import_data_from_project.rb       | 2 +-
 .../20150421120000_remove_periods_at_ends_of_usernames.rb   | 2 +-
 ...d_default_project_visibililty_to_application_settings.rb | 2 +-
 ...ge_collation_for_tag_names.acts_as_taggable_on_engine.rb | 2 +-
 db/migrate/20150425164647_remove_duplicate_tags.rb          | 2 +-
 ...add_missing_unique_indices.acts_as_taggable_on_engine.rb | 2 +-
 ...ings_counter_cache_to_tags.acts_as_taggable_on_engine.rb | 2 +-
 ...add_missing_taggable_index.acts_as_taggable_on_engine.rb | 2 +-
 ...ge_collation_for_tag_names.acts_as_taggable_on_engine.rb | 2 +-
 ...173433_add_default_snippet_visibility_to_app_settings.rb | 2 +-
 ...20150429002313_remove_abandoned_group_members_records.rb | 2 +-
 ...add_restricted_signup_domains_to_application_settings.rb | 2 +-
 db/migrate/20150509180749_convert_legacy_reference_notes.rb | 2 +-
 db/migrate/20150516060434_add_note_events_to_web_hooks.rb   | 2 +-
 ...7_add_user_oauth_applications_to_application_settings.rb | 2 +-
 ...0354_add_after_sign_out_path_for_application_settings.rb | 2 +-
 ...121_add_session_expire_delay_for_application_settings.rb | 2 +-
 db/migrate/20150610065936_add_dashboard_to_users.rb         | 2 +-
 ...150620233230_add_default_otp_required_for_login_value.rb | 2 +-
 db/migrate/20150713160110_add_project_view_to_users.rb      | 2 +-
 db/migrate/20150717130904_add_commits_count_to_project.rb   | 2 +-
 .../20150730122406_add_updated_by_to_issuables_and_notes.rb | 2 +-
 db/migrate/20150806104937_create_abuse_reports.rb           | 2 +-
 db/migrate/20150812080800_add_settings_import_sources.rb    | 2 +-
 db/migrate/20150814065925_remove_oauth_tokens_from_users.rb | 2 +-
 db/migrate/20150817163600_deduplicate_user_identities.rb    | 2 +-
 db/migrate/20150818213832_add_sent_notifications.rb         | 2 +-
 db/migrate/20150824002011_add_enable_ssl_verification.rb    | 2 +-
 db/migrate/20150826001931_add_ci_tables.rb                  | 2 +-
 .../20150827121444_add_fast_forward_option_to_project.rb    | 2 +-
 db/migrate/20150902001023_add_template_to_label.rb          | 2 +-
 db/migrate/20150914215247_add_ci_tags.rb                    | 2 +-
 .../20150915001905_enable_ssl_verification_by_default.rb    | 2 +-
 .../20150916000405_enable_ssl_verification_for_web_hooks.rb | 2 +-
 ...0916114643_add_help_page_text_to_application_settings.rb | 2 +-
 .../20150916145038_add_index_for_committed_at_and_id.rb     | 2 +-
 ...20150918084513_add_ci_enabled_to_application_settings.rb | 2 +-
 ...8161719_remove_invalid_milestones_from_merge_requests.rb | 2 +-
 db/migrate/20150920010715_add_consumed_timestep_to_users.rb | 2 +-
 .../20150920161119_add_line_code_to_sent_notification.rb    | 2 +-
 db/migrate/20150924125150_add_project_id_to_ci_commit.rb    | 2 +-
 .../20150924125436_migrate_project_id_for_ci_commits.rb     | 2 +-
 db/migrate/20150930001110_merge_request_error_field.rb      | 2 +-
 .../20150930095736_add_null_to_name_for_ci_projects.rb      | 2 +-
 db/migrate/20150930110012_add_group_share_lock.rb           | 2 +-
 db/migrate/20151002112914_add_stage_idx_to_builds.rb        | 2 +-
 db/migrate/20151002121400_add_index_for_builds.rb           | 2 +-
 db/migrate/20151002122929_add_ref_and_tag_to_builds.rb      | 2 +-
 db/migrate/20151002122943_migrate_ref_and_tag_to_build.rb   | 2 +-
 db/migrate/20151005075649_add_user_id_to_build.rb           | 2 +-
 db/migrate/20151005150751_add_layout_option_for_users.rb    | 2 +-
 ...005162154_remove_ci_enabled_from_application_settings.rb | 2 +-
 ...20151007120511_namespaces_projects_path_lower_indexes.rb | 2 +-
 ...20151008110232_add_users_lower_username_email_indexes.rb | 2 +-
 .../20151008123042_add_type_and_description_to_builds.rb    | 2 +-
 ...20151008130321_migrate_name_to_description_for_builds.rb | 2 +-
 .../20151008143519_add_admin_notification_email_setting.rb  | 2 +-
 db/migrate/20151012173029_set_jira_service_api_url.rb       | 2 +-
 db/migrate/20151013092124_add_artifacts_file_to_builds.rb   | 2 +-
 .../20151016131433_add_ci_projects_gl_project_id_index.rb   | 2 +-
 .../20151016195451_add_ci_builds_and_projects_indexes.rb    | 2 +-
 db/migrate/20151016195706_add_notes_line_code_index.rb      | 2 +-
 db/migrate/20151019111551_fix_build_tags.rb                 | 2 +-
 db/migrate/20151019111703_fail_build_without_names.rb       | 2 +-
 db/migrate/20151020145526_add_services_template_index.rb    | 2 +-
 db/migrate/20151020173516_ci_limits_to_mysql.rb             | 2 +-
 db/migrate/20151020173906_add_ci_builds_index_for_status.rb | 2 +-
 db/migrate/20151023112551_fail_build_with_empty_name.rb     | 2 +-
 db/migrate/20151023144219_remove_satellites.rb              | 2 +-
 db/migrate/20151026182941_add_project_path_index.rb         | 2 +-
 ...152939_add_merge_when_build_succeeds_to_merge_request.rb | 2 +-
 db/migrate/20151103001141_add_public_to_group.rb            | 2 +-
 db/migrate/20151103133339_add_shared_runners_setting.rb     | 2 +-
 db/migrate/20151103134857_create_lfs_objects.rb             | 2 +-
 db/migrate/20151103134958_create_lfs_objects_projects.rb    | 2 +-
 db/migrate/20151104105513_add_file_to_lfs_objects.rb        | 2 +-
 db/migrate/20151105094515_create_releases.rb                | 2 +-
 db/migrate/20151106000015_add_is_award_to_notes.rb          | 2 +-
 ...100728_add_max_artifacts_size_to_application_settings.rb | 2 +-
 db/migrate/20151109134526_add_issues_state_index.rb         | 2 +-
 .../20151109134916_add_projects_visibility_level_index.rb   | 2 +-
 db/migrate/20151110125604_add_import_error_to_project.rb    | 2 +-
 db/migrate/20151114113410_add_index_for_lfs_oid_and_size.rb | 2 +-
 db/migrate/20151116144118_add_unique_for_lfs_oid_index.rb   | 2 +-
 db/migrate/20151118162244_add_projects_public_index.rb      | 2 +-
 db/migrate/20151201203948_raise_hook_url_limit.rb           | 2 +-
 .../20151203162133_add_hide_project_limit_to_users.rb       | 2 +-
 db/migrate/20151203162134_add_build_events_to_services.rb   | 2 +-
 db/migrate/20151209144329_migrate_ci_web_hooks.rb           | 2 +-
 db/migrate/20151209145909_migrate_ci_emails.rb              | 2 +-
 db/migrate/20151210030143_add_unlock_token_to_user.rb       | 2 +-
 ...dd_runners_registration_token_to_application_settings.rb | 2 +-
 db/migrate/20151210125232_migrate_ci_slack_service.rb       | 2 +-
 db/migrate/20151210125927_migrate_ci_hip_chat_service.rb    | 2 +-
 db/migrate/20151210125928_add_ci_to_project.rb              | 2 +-
 db/migrate/20151210125929_add_project_id_to_ci.rb           | 2 +-
 db/migrate/20151210125930_migrate_ci_to_project.rb          | 2 +-
 db/migrate/20151210125931_add_index_to_ci_tables.rb         | 2 +-
 db/migrate/20151210125932_drop_null_for_ci_tables.rb        | 2 +-
 ...20151215132013_add_pages_size_to_application_settings.rb | 2 +-
 .../20151218154042_add_tfa_to_application_settings.rb       | 2 +-
 db/migrate/20151221234414_add_tfa_additional_fields.rb      | 2 +-
 db/migrate/20151224123230_rename_emojis.rb                  | 2 +-
 db/migrate/20151228111122_remove_public_from_namespace.rb   | 2 +-
 db/migrate/20151228150906_influxdb_settings.rb              | 2 +-
 .../20151228175719_add_recaptcha_to_application_settings.rb | 2 +-
 db/migrate/20151229102248_influxdb_udp_port_setting.rb      | 2 +-
 .../20151229112614_influxdb_remote_database_setting.rb      | 2 +-
 .../20151230132518_add_artifacts_metadata_to_ci_build.rb    | 2 +-
 .../20151231152326_add_akismet_to_application_settings.rb   | 2 +-
 ...51231202530_remove_alert_type_from_broadcast_messages.rb | 2 +-
 db/migrate/20160106162223_add_index_milestones_title.rb     | 2 +-
 db/migrate/20160106164438_remove_influxdb_credentials.rb    | 2 +-
 db/migrate/20160109054846_create_spam_logs.rb               | 2 +-
 db/migrate/20160113111034_add_metrics_sample_interval.rb    | 2 +-
 .../20160118155830_add_sentry_to_application_settings.rb    | 2 +-
 ...2755_add_ip_blocking_settings_to_application_settings.rb | 2 +-
 db/migrate/20160119111158_add_services_category.rb          | 2 +-
 db/migrate/20160119112418_add_services_default.rb           | 2 +-
 db/migrate/20160119145451_add_ldap_email_to_users.rb        | 2 +-
 ...0120172143_add_base_commit_sha_to_merge_request_diffs.rb | 2 +-
 ...0729_add_email_author_in_body_to_application_settings.rb | 2 +-
 db/migrate/20160122185421_add_pending_delete_to_project.rb  | 2 +-
 ...remove_ip_blocking_settings_from_application_settings.rb | 2 +-
 db/migrate/20160128233227_change_lfs_objects_size_column.rb | 2 +-
 ...0160129135155_remove_dot_atom_path_ending_of_projects.rb | 2 +-
 ...20160129155512_add_merge_commit_sha_to_merge_requests.rb | 2 +-
 db/migrate/20160202091601_add_erasable_to_ci_build.rb       | 2 +-
 ...160202164642_add_allow_guest_to_access_builds_project.rb | 2 +-
 .../20160204144558_add_real_size_to_merge_request_diffs.rb  | 2 +-
 db/migrate/20160209130428_add_index_to_snippet.rb           | 2 +-
 db/migrate/20160210105555_create_pages_domain.rb            | 2 +-
 db/migrate/20160212123307_create_tasks.rb                   | 2 +-
 db/migrate/20160217100506_add_description_to_label.rb       | 2 +-
 db/migrate/20160217174422_add_note_to_tasks.rb              | 2 +-
 db/migrate/20160220123949_rename_tasks_to_todos.rb          | 2 +-
 db/migrate/20160222153918_create_appearances_ce.rb          | 2 +-
 db/migrate/20160223192159_add_confidential_to_issues.rb     | 2 +-
 db/migrate/20160225090018_add_delete_at_to_issues.rb        | 2 +-
 .../20160225101956_add_delete_at_to_merge_requests.rb       | 2 +-
 .../20160226114608_add_trigram_indexes_for_searching.rb     | 2 +-
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 db/migrate/20160227120047_add_event_to_services.rb          | 2 +-
 .../20160229193553_add_main_language_to_repository.rb       | 2 +-
 db/migrate/20160301124843_add_visibility_level_to_groups.rb | 2 +-
 db/migrate/20160301174731_add_fingerprint_index.rb          | 2 +-
 ...2151724_add_import_credentials_to_project_import_data.rb | 2 +-
 .../20160302152808_remove_wrong_import_url_from_projects.rb | 2 +-
 .../20160305220806_remove_expires_at_from_snippets.rb       | 2 +-
 .../20160307221555_disallow_blank_line_code_on_note.rb      | 2 +-
 ..._add_default_group_visibility_to_application_settings.rb | 2 +-
 db/migrate/20160309140734_fix_todos.rb                      | 2 +-
 db/migrate/20160310124959_add_due_date_to_issues.rb         | 2 +-
 db/migrate/20160310185910_add_external_flag_to_users.rb     | 2 +-
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 db/migrate/20160314143402_projects_add_pushes_since_gc.rb   | 2 +-
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 db/migrate/20160316204731_add_commit_id_to_todos.rb         | 2 +-
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 ...0160331133914_remove_todos_for_deleted_merge_requests.rb | 2 +-
 ...ove_twitter_sharing_enabled_from_application_settings.rb | 2 +-
 db/migrate/20160407120251_add_images_enabled_for_project.rb | 2 +-
 .../20160412140240_add_repository_checks_enabled_setting.rb | 2 +-
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 db/migrate/20160415062917_create_personal_access_tokens.rb  | 2 +-
 ...33440_add_shared_runners_text_to_application_settings.rb | 2 +-
 db/migrate/20160416180807_add_award_emoji.rb                | 2 +-
 .../20160416182152_convert_award_note_to_emoji_award.rb     | 2 +-
 db/migrate/20160419120017_add_metrics_packet_size.rb        | 2 +-
 ...01_add_only_allow_merge_if_build_succeeds_to_projects.rb | 2 +-
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 db/migrate/20160425045124_create_u2f_registrations.rb       | 2 +-
 ...isabled_oauth_sign_in_sources_to_application_settings.rb | 2 +-
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 ...60508202603_add_head_commit_id_to_merge_request_diffs.rb | 2 +-
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 db/migrate/20160509091049_add_locked_to_ci_runner.rb        | 2 +-
 ...add_health_check_access_token_to_application_settings.rb | 2 +-
 ..._send_user_confirmation_email_to_application_settings.rb | 2 +-
 ...0516224534_add_start_commit_id_to_merge_request_diffs.rb | 2 +-
 ...20160518200441_add_artifacts_expire_date_to_ci_builds.rb | 2 +-
 ...203051_add_developers_can_merge_to_protected_branches.rb | 2 +-
 ...15720_add_note_type_and_position_to_sent_notification.rb | 2 +-
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 ...117_remove_notification_settings_for_deleted_projects.rb | 2 +-
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 ...r_registry_token_expire_delay_to_application_settings.rb | 2 +-
 ...0603075128_add_has_external_issue_tracker_to_projects.rb | 2 +-
 ...0160603180330_remove_duplicated_notification_settings.rb | 2 +-
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 ...155312_add_after_sign_up_text_to_application_settings.rb | 2 +-
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 ...215_add_user_default_external_to_application_settings.rb | 2 +-
 ...0403_remove_notification_setting_not_null_constraints.rb | 2 +-
 ...emove_deprecated_issues_tracker_columns_from_projects.rb | 2 +-
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 db/migrate/20180831164910_import_common_metrics.rb          | 2 +-
 ...33_add_project_config_source_status_index_to_pipeline.rb | 2 +-
 ...80901200537_add_resource_label_event_reference_fields.rb | 2 +-
 ...6101639_add_user_ping_consent_to_application_settings.rb | 2 +-
 ...180907015926_add_legacy_abac_to_cluster_providers_gcp.rb | 2 +-
 ...20180910115836_add_attr_encrypted_columns_to_web_hook.rb | 2 +-
 ...0910153412_add_token_digest_to_personal_access_tokens.rb | 2 +-
 ...3_add_index_to_token_digest_on_personal_access_tokens.rb | 2 +-
 db/migrate/20180912111628_add_knative_application.rb        | 2 +-
 .../20180916011959_add_index_pipelines_project_id_source.rb | 2 +-
 ...1949_add_diff_max_patch_bytes_to_application_settings.rb | 2 +-
 db/migrate/20180924190739_add_scheduled_at_to_ci_builds.rb  | 2 +-
 .../20180924201039_add_partial_index_to_scheduled_at.rb     | 2 +-
 db/migrate/20180925200829_create_user_preferences.rb        | 2 +-
 ...10_add_index_to_project_deploy_tokens_deploy_token_id.rb | 2 +-
 .../20181002172433_remove_restricted_todos_with_cte.rb      | 2 +-
 .../20181005110927_add_index_to_lfs_objects_file_store.rb   | 2 +-
 db/migrate/20181005125926_add_index_to_uploads_store.rb     | 2 +-
 .../20181009190428_create_clusters_kubernetes_namespaces.rb | 2 +-
 .../20181010235606_create_board_project_recent_visits.rb    | 2 +-
 db/migrate/20181014203236_create_cluster_groups.rb          | 2 +-
 db/migrate/20181015155839_add_finished_at_to_deployments.rb | 2 +-
 db/migrate/20181016141739_add_status_to_deployments.rb      | 2 +-
 .../20181016152238_create_board_group_recent_visits.rb      | 2 +-
 db/migrate/20181017001059_add_cluster_type_to_clusters.rb   | 2 +-
 db/migrate/20181019032400_add_shards_table.rb               | 2 +-
 db/migrate/20181019032408_add_repositories_table.rb         | 2 +-
 ...019105553_add_projects_pool_repository_id_foreign_key.rb | 2 +-
 .../20181022135539_add_index_on_status_to_deployments.rb    | 2 +-
 ...8_add_archive_builds_duration_to_application_settings.rb | 2 +-
 ...9_add_partial_index_for_legacy_successful_deployments.rb | 2 +-
 ...private_commit_email_hostname_to_application_settings.rb | 2 +-
 ...026143227_migrate_snippets_access_level_default_value.rb | 2 +-
 .../20181030154446_add_missing_indexes_for_foreign_keys.rb  | 2 +-
 db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb     | 2 +-
 db/migrate/20181031190559_drop_gcp_clusters_table.rb        | 2 +-
 db/migrate/20181101144347_add_index_for_stuck_mr_query.rb   | 2 +-
 db/migrate/20181106135939_add_index_to_deployments.rb       | 2 +-
 ...181112103239_drop_default_value_on_status_deployments.rb | 2 +-
 db/migrate/gpg_keys_limits_to_mysql.rb                      | 2 +-
 .../limits_ci_build_trace_chunks_raw_data_for_mysql.rb      | 2 +-
 db/migrate/limits_to_mysql.rb                               | 2 +-
 db/migrate/markdown_cache_limits_to_mysql.rb                | 2 +-
 db/migrate/merge_request_diff_file_limits_to_mysql.rb       | 2 +-
 db/migrate/prometheus_metrics_limits_to_mysql.rb            | 2 +-
 db/optional_migrations/composite_primary_keys.rb            | 2 +-
 ...ge_personal_access_tokens_default_back_to_empty_array.rb | 2 +-
 ...0161011222551_remove_inactive_jira_service_properties.rb | 2 +-
 ...109150329_fix_project_records_with_invalid_visibility.rb | 2 +-
 .../20161128170531_drop_user_activities_table.rb            | 2 +-
 db/post_migrate/20161221140236_remove_unneeded_services.rb  | 2 +-
 .../20161221153951_rename_reserved_project_names.rb         | 2 +-
 .../20170104150317_requeue_pending_delete_projects.rb       | 2 +-
 db/post_migrate/20170106142508_fill_authorized_projects.rb  | 2 +-
 ...0170106172224_remove_project_authorizations_id_column.rb | 2 +-
 ...70131214021_reset_users_authorized_projects_populated.rb | 2 +-
 ...20170206040400_remove_inactive_default_email_services.rb | 2 +-
 ...20170206101007_remove_trackable_columns_from_timelogs.rb | 2 +-
 .../20170206101030_validate_foreign_keys_on_timelogs.rb     | 2 +-
 ...140523_validate_foreign_keys_on_oauth_openid_requests.rb | 2 +-
 .../20170211073944_disable_invalid_service_templates.rb     | 2 +-
 .../20170214111112_delete_deprecated_gitlab_ci_service.rb   | 2 +-
 .../20170215200045_remove_theme_id_from_users.rb            | 2 +-
 ...0170301205640_migrate_build_events_to_pipeline_events.rb | 2 +-
 .../20170306170512_migrate_legacy_manual_actions.rb         | 2 +-
 .../20170309171644_reset_relative_position_for_issue.rb     | 2 +-
 .../20170313133418_rename_more_reserved_project_names.rb    | 2 +-
 .../20170317162059_update_upload_paths_to_system.rb         | 2 +-
 ...416_migrate_user_activities_to_users_last_activity_on.rb | 2 +-
 .../20170404170532_remove_notes_original_discussion_id.rb   | 2 +-
 db/post_migrate/20170406111121_clean_upload_symlinks.rb     | 2 +-
 db/post_migrate/20170406142253_migrate_user_project_view.rb | 2 +-
 .../20170408033905_remove_old_cache_directories.rb          | 2 +-
 .../20170412174900_rename_reserved_dynamic_paths.rb         | 2 +-
 ...21605_migrate_trigger_schedules_to_pipeline_schedules.rb | 2 +-
 .../20170425130047_drop_ci_trigger_schedules_table.rb       | 2 +-
 ...02070007_enable_auto_cancel_pending_pipelines_for_all.rb | 2 +-
 ...2101023_cleanup_namespaceless_pending_delete_projects.rb | 2 +-
 .../20170503004427_update_retried_for_ci_build.rb           | 2 +-
 ...0503120310_remove_users_authorized_projects_populated.rb | 2 +-
 ...170508170547_add_head_pipeline_for_each_merge_request.rb | 2 +-
 ...0510101043_add_foreign_key_on_pipeline_schedule_owner.rb | 2 +-
 ...0_cleanup_rename_web_hooks_build_events_to_job_events.rb | 2 +-
 ...00_cleanup_rename_services_build_events_to_job_events.rb | 2 +-
 .../20170516165238_cleanup_trigger_for_issues.rb            | 2 +-
 ...170516181025_add_constraints_to_issue_assignees_table.rb | 2 +-
 .../20170518200835_rename_users_with_renamed_namespace.rb   | 2 +-
 .../20170518231126_fix_wrongly_renamed_routes.rb            | 2 +-
 .../20170523073948_remove_assignee_id_from_issue.rb         | 2 +-
 db/post_migrate/20170523083112_migrate_old_artifacts.rb     | 2 +-
 .../20170525140254_rename_all_reserved_paths_again.rb       | 2 +-
 db/post_migrate/20170526185842_migrate_pipeline_stages.rb   | 2 +-
 .../20170526185858_create_index_in_pipeline_stages.rb       | 2 +-
 .../20170526185901_remove_stage_id_index_from_builds.rb     | 2 +-
 .../20170526185921_migrate_build_stage_reference.rb         | 2 +-
 .../20170526190000_migrate_build_stage_reference_again.rb   | 2 +-
 .../20170531203055_cleanup_users_ldap_email_rename.rb       | 2 +-
 .../20170606202615_move_appearance_to_system_dir.rb         | 2 +-
 ...21233_convert_custom_notification_settings_to_columns.rb | 2 +-
 .../20170609183112_remove_position_from_issuables.rb        | 2 +-
 .../20170612071012_move_personal_snippets_files.rb          | 2 +-
 db/post_migrate/20170613111224_clean_appearance_symlinks.rb | 2 +-
 .../20170621102400_add_stage_id_index_to_builds.rb          | 2 +-
 db/post_migrate/20170627101016_schedule_event_migrations.rb | 2 +-
 ...170628080858_migrate_stage_id_reference_in_background.rb | 2 +-
 ...31_cleanup_application_settings_signin_enabled_rename.rb | 2 +-
 ...20170703130158_schedule_merge_request_diff_migrations.rb | 2 +-
 db/post_migrate/20170711145558_migrate_stages_statuses.rb   | 2 +-
 ...70717111152_cleanup_move_system_upload_folder_symlink.rb | 2 +-
 ...17150329_enqueue_migrate_system_uploads_to_new_folder.rb | 2 +-
 ...70719150301_merge_issuable_reopened_into_opened_state.rb | 2 +-
 ...170728101014_remove_events_from_notification_settings.rb | 2 +-
 .../20170803090603_calculate_conv_dev_index_percentages.rb  | 2 +-
 ...807160457_remove_locked_at_column_from_merge_requests.rb | 2 +-
 ...90736_move_personal_snippet_files_into_correct_folder.rb | 2 +-
 .../20170815060945_remove_duplicate_mr_events.rb            | 2 +-
 ...cleanup_nonexisting_namespace_pending_delete_projects.rb | 2 +-
 .../20170822101017_migrate_pipeline_sidekiq_queues.rb       | 2 +-
 ...828170502_post_deploy_migrate_user_external_mail_data.rb | 2 +-
 .../20170828170513_remove_user_email_provider_column.rb     | 2 +-
 .../20170828170516_remove_user_external_mail_columns.rb     | 2 +-
 db/post_migrate/20170830084744_destroy_gpg_signatures.rb    | 2 +-
 .../20170830150306_drop_events_for_migration_table.rb       | 2 +-
 ...0831195038_remove_valid_signature_from_gpg_signatures.rb | 2 +-
 .../20170907170235_delete_conflicting_redirect_routes.rb    | 2 +-
 .../20170913180600_fix_projects_without_project_feature.rb  | 2 +-
 .../20170921101004_normalize_ldap_extern_uids.rb            | 2 +-
 ...50348_schedule_merge_request_diff_migrations_take_two.rb | 2 +-
 ...170927112318_update_legacy_diff_notes_type_for_import.rb | 2 +-
 .../20170927112319_update_notes_type_for_import.rb          | 2 +-
 ...5130944_schedule_create_gpg_key_subkeys_from_gpg_keys.rb | 2 +-
 .../20171012150314_remove_user_authentication_token.rb      | 2 +-
 ...27_migrate_gcp_clusters_to_new_clusters_architectures.rb | 2 +-
 ...merge_request_latest_merge_request_diff_id_migrations.rb | 2 +-
 ...20171101134435_remove_ref_fetched_from_merge_requests.rb | 2 +-
 db/post_migrate/20171103140253_track_untracked_uploads.rb   | 2 +-
 ...ation_settings_password_authentication_enabled_rename.rb | 2 +-
 db/post_migrate/20171106154015_remove_issues_branch_name.rb | 2 +-
 ...171106180641_cleanup_add_timezone_to_issues_closed_at.rb | 2 +-
 .../20171114104051_remove_empty_fork_networks.rb            | 2 +-
 ...421_remove_merge_request_diff_st_commits_and_st_diffs.rb | 2 +-
 .../20171123101020_update_circuitbreaker_defaults.rb        | 2 +-
 .../20171123101046_remove_old_circuitbreaker_config.rb      | 2 +-
 ..._index_on_merge_request_diffs_merge_request_id_and_id.rb | 2 +-
 ...ve_index_on_merge_request_diffs_merge_request_diff_id.rb | 2 +-
 ...rate_kubernetes_service_to_new_clusters_architectures.rb | 2 +-
 .../20171124150326_reschedule_fork_network_creation.rb      | 2 +-
 ...edule_populate_merge_request_metrics_with_events_data.rb | 2 +-
 ...0171205190711_reschedule_fork_network_creation_caller.rb | 2 +-
 .../20171207150300_remove_project_labels_group_id_copy.rb   | 2 +-
 .../20171207150343_remove_soft_removed_objects.rb           | 2 +-
 db/post_migrate/20171207150344_remove_deleted_at_columns.rb | 2 +-
 ...5_migrate_github_importer_advance_stage_sidekiq_queue.rb | 2 +-
 ...1205_post_populate_can_push_from_deploy_keys_projects.rb | 2 +-
 db/post_migrate/20171215121259_remove_can_push_from_keys.rb | 2 +-
 .../20171219121201_normalize_extern_uid_from_identities.rb  | 2 +-
 .../20171221140220_schedule_issues_closed_at_type_change.rb | 2 +-
 ...052_schedule_set_confidential_note_events_on_webhooks.rb | 2 +-
 .../20180119121225_remove_redundant_pipeline_stages.rb      | 2 +-
 ...930_schedule_set_confidential_note_events_on_services.rb | 2 +-
 .../20180202111106_remove_project_labels_group_id.rb        | 2 +-
 .../20180204200836_change_author_id_to_not_null_in_todos.rb | 2 +-
 .../20180212101828_add_tmp_partial_null_index_to_builds.rb  | 2 +-
 .../20180212101928_schedule_build_stage_migration.rb        | 2 +-
 ...80212102028_remove_tmp_partial_null_index_from_builds.rb | 2 +-
 .../20180216121020_fill_pages_domain_verification_code.rb   | 2 +-
 .../20180216121030_enqueue_verify_pages_domain_workers.rb   | 2 +-
 ...180220150310_remove_empty_extern_uid_auth0_identities.rb | 2 +-
 .../20180223124427_build_user_interacted_projects_table.rb  | 6 +++---
 .../20180301084653_change_project_namespace_id_not_null.rb  | 2 +-
 .../20180305100050_remove_permanent_from_redirect_routes.rb | 2 +-
 ...306074045_migrate_create_trace_artifact_sidekiq_queue.rb | 2 +-
 .../20180306164012_add_path_index_to_redirect_routes.rb     | 2 +-
 ..._update_head_pipeline_for_merge_request_sidekiq_queue.rb | 2 +-
 .../20180405101928_reschedule_builds_stages_migration.rb    | 2 +-
 .../20180408143355_cleanup_users_rss_token_rename.rb        | 2 +-
 ...0180409170809_populate_missing_project_ci_cd_settings.rb | 2 +-
 .../20180420080616_schedule_stages_index_migration.rb       | 2 +-
 db/post_migrate/20180424151928_fill_file_store.rb           | 2 +-
 ...3705_backfill_runner_type_for_ci_runners_post_migrate.rb | 2 +-
 ..._attributes_data_from_projects_to_project_mirror_data.rb | 2 +-
 .../20180507083701_set_minimal_project_build_timeout.rb     | 2 +-
 ..._add_unique_constraint_to_project_features_project_id.rb | 2 +-
 ...dd_not_null_constraint_to_project_features_project_id.rb | 2 +-
 db/post_migrate/20180514161336_remove_gemnasium_service.rb  | 2 +-
 ..._remaining_mr_metrics_populating_background_migration.rb | 2 +-
 ...leanup_merge_requests_allow_maintainer_to_push_rename.rb | 2 +-
 .../20180529152628_schedule_to_archive_legacy_traces.rb     | 2 +-
 ...603190921_migrate_object_storage_upload_sidekiq_queue.rb | 2 +-
 .../20180604123514_cleanup_stages_position_migration.rb     | 2 +-
 ...435_cleanup_merge_requests_allow_collaboration_rename.rb | 2 +-
 .../20180619121030_enqueue_delete_diff_files_workers.rb     | 2 +-
 ...artial_index_to_projects_for_last_repository_check_at.rb | 2 +-
 .../20180702120647_enqueue_fix_cross_project_label_links.rb | 2 +-
 db/post_migrate/20180704145007_update_project_indexes.rb    | 2 +-
 db/post_migrate/20180706223200_populate_site_statistics.rb  | 2 +-
 ...0180723130817_delete_inconsistent_internal_id_records.rb | 2 +-
 .../20180809195358_migrate_null_wiki_access_levels.rb       | 2 +-
 ...80816161409_migrate_legacy_artifacts_to_job_artifacts.rb | 2 +-
 .../20180816193530_rename_login_root_namespaces.rb          | 2 +-
 .../20180826111825_recalculate_site_statistics.rb           | 2 +-
 .../20180906051323_remove_orphaned_label_links.rb           | 2 +-
 ...0913051323_consume_remaining_diff_files_deletion_jobs.rb | 2 +-
 ...20180913142237_schedule_digest_personal_access_tokens.rb | 2 +-
 db/post_migrate/20180914162043_encrypt_web_hooks_columns.rb | 2 +-
 ...2_remove_sidekiq_throttling_from_application_settings.rb | 2 +-
 .../20180916014356_populate_external_pipeline_source.rb     | 2 +-
 ...0180917172041_remove_wikis_count_from_site_statistics.rb | 2 +-
 db/post_migrate/20181008145341_steal_encrypt_columns.rb     | 2 +-
 .../20181008145359_remove_web_hooks_token_and_url.rb        | 2 +-
 db/post_migrate/20181008200441_remove_circuit_breaker.rb    | 2 +-
 ...0181013005024_remove_koding_from_application_settings.rb | 2 +-
 db/post_migrate/20181014121030_enqueue_redact_links.rb      | 2 +-
 ...2173835_enqueue_populate_cluster_kubernetes_namespace.rb | 2 +-
 .../20181030135124_fill_empty_finished_at_in_deployments.rb | 2 +-
 db/post_migrate/20181105201455_steal_fill_store_upload.rb   | 2 +-
 .../20181107054254_remove_restricted_todos_again.rb         | 2 +-
 1062 files changed, 1064 insertions(+), 1064 deletions(-)

diff --git a/db/migrate/20140313092127_init_schema.rb b/db/migrate/20140313092127_init_schema.rb
index 29fb386ad76..4188599b4b4 100644
--- a/db/migrate/20140313092127_init_schema.rb
+++ b/db/migrate/20140313092127_init_schema.rb
@@ -1,4 +1,4 @@
-class InitSchema < ActiveRecord::Migration
+class InitSchema < ActiveRecord::Migration[4.2]
   DOWNTIME = true
 
   # rubocop:disable Metrics/AbcSize
diff --git a/db/migrate/20140407135544_fix_namespaces.rb b/db/migrate/20140407135544_fix_namespaces.rb
index 3d2ca5c13c4..b16d65c4b51 100644
--- a/db/migrate/20140407135544_fix_namespaces.rb
+++ b/db/migrate/20140407135544_fix_namespaces.rb
@@ -1,4 +1,4 @@
-class FixNamespaces < ActiveRecord::Migration
+class FixNamespaces < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20140414131055_change_state_to_allow_empty_merge_request_diffs.rb b/db/migrate/20140414131055_change_state_to_allow_empty_merge_request_diffs.rb
index fb9c7a6636e..148b46f8830 100644
--- a/db/migrate/20140414131055_change_state_to_allow_empty_merge_request_diffs.rb
+++ b/db/migrate/20140414131055_change_state_to_allow_empty_merge_request_diffs.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class ChangeStateToAllowEmptyMergeRequestDiffs < ActiveRecord::Migration
+class ChangeStateToAllowEmptyMergeRequestDiffs < ActiveRecord::Migration[4.2]
   def up
     change_column :merge_request_diffs, :state, :string, null: true,
                   default: nil
diff --git a/db/migrate/20140416074002_add_index_on_iid.rb b/db/migrate/20140416074002_add_index_on_iid.rb
index 6cdaa5a3c08..c7f707ca123 100644
--- a/db/migrate/20140416074002_add_index_on_iid.rb
+++ b/db/migrate/20140416074002_add_index_on_iid.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexOnIid < ActiveRecord::Migration
+class AddIndexOnIid < ActiveRecord::Migration[4.2]
   def change
     RemoveDuplicateIid.clean(Issue)
     RemoveDuplicateIid.clean(MergeRequest, 'target_project_id')
diff --git a/db/migrate/20140416185734_index_on_current_sign_in_at.rb b/db/migrate/20140416185734_index_on_current_sign_in_at.rb
index 8c620b545bd..7dabcb937b3 100644
--- a/db/migrate/20140416185734_index_on_current_sign_in_at.rb
+++ b/db/migrate/20140416185734_index_on_current_sign_in_at.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class IndexOnCurrentSignInAt < ActiveRecord::Migration
+class IndexOnCurrentSignInAt < ActiveRecord::Migration[4.2]
   def change
     add_index :users, :current_sign_in_at
   end
diff --git a/db/migrate/20140428105831_add_notes_index_updated_at.rb b/db/migrate/20140428105831_add_notes_index_updated_at.rb
index 0589101af93..25bdf477e24 100644
--- a/db/migrate/20140428105831_add_notes_index_updated_at.rb
+++ b/db/migrate/20140428105831_add_notes_index_updated_at.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddNotesIndexUpdatedAt < ActiveRecord::Migration
+class AddNotesIndexUpdatedAt < ActiveRecord::Migration[4.2]
   def change
     add_index :notes, :updated_at
   end
diff --git a/db/migrate/20140502115131_add_repo_size_to_db.rb b/db/migrate/20140502115131_add_repo_size_to_db.rb
index 090b30a4f26..4cb7a01bbf2 100644
--- a/db/migrate/20140502115131_add_repo_size_to_db.rb
+++ b/db/migrate/20140502115131_add_repo_size_to_db.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddRepoSizeToDb < ActiveRecord::Migration
+class AddRepoSizeToDb < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :repository_size, :float, default: 0
   end
diff --git a/db/migrate/20140502125220_migrate_repo_size.rb b/db/migrate/20140502125220_migrate_repo_size.rb
index ca1b054600c..a69b02cddc4 100644
--- a/db/migrate/20140502125220_migrate_repo_size.rb
+++ b/db/migrate/20140502125220_migrate_repo_size.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateRepoSize < ActiveRecord::Migration
+class MigrateRepoSize < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20140611135229_add_position_to_merge_request.rb b/db/migrate/20140611135229_add_position_to_merge_request.rb
index 3a7d2f7c359..6ec644eecce 100644
--- a/db/migrate/20140611135229_add_position_to_merge_request.rb
+++ b/db/migrate/20140611135229_add_position_to_merge_request.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPositionToMergeRequest < ActiveRecord::Migration
+class AddPositionToMergeRequest < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :position, :integer, default: 0
   end
diff --git a/db/migrate/20140625115202_create_users_star_projects.rb b/db/migrate/20140625115202_create_users_star_projects.rb
index d4f3fe5ac62..2237927fc78 100644
--- a/db/migrate/20140625115202_create_users_star_projects.rb
+++ b/db/migrate/20140625115202_create_users_star_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateUsersStarProjects < ActiveRecord::Migration
+class CreateUsersStarProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20140729134820_create_labels.rb b/db/migrate/20140729134820_create_labels.rb
index 66d20e741a6..1060610b660 100644
--- a/db/migrate/20140729134820_create_labels.rb
+++ b/db/migrate/20140729134820_create_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateLabels < ActiveRecord::Migration
+class CreateLabels < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20140729140420_create_label_links.rb b/db/migrate/20140729140420_create_label_links.rb
index dacd9f2e4b6..b8596a44a21 100644
--- a/db/migrate/20140729140420_create_label_links.rb
+++ b/db/migrate/20140729140420_create_label_links.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateLabelLinks < ActiveRecord::Migration
+class CreateLabelLinks < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20140729145339_migrate_project_tags.rb b/db/migrate/20140729145339_migrate_project_tags.rb
index 5760e4bfeaa..711a2d262aa 100644
--- a/db/migrate/20140729145339_migrate_project_tags.rb
+++ b/db/migrate/20140729145339_migrate_project_tags.rb
@@ -1,4 +1,4 @@
-class MigrateProjectTags < ActiveRecord::Migration
+class MigrateProjectTags < ActiveRecord::Migration[4.2]
   def up
     ActsAsTaggableOn::Tagging.where(taggable_type: 'Project', context: 'labels').update_all(context: 'tags')
   end
diff --git a/db/migrate/20140729152420_migrate_taggable_labels.rb b/db/migrate/20140729152420_migrate_taggable_labels.rb
index 04cdc6beadd..a8bf8022dfc 100644
--- a/db/migrate/20140729152420_migrate_taggable_labels.rb
+++ b/db/migrate/20140729152420_migrate_taggable_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateTaggableLabels < ActiveRecord::Migration
+class MigrateTaggableLabels < ActiveRecord::Migration[4.2]
   def up
     taggings = ActsAsTaggableOn::Tagging.where(taggable_type: ['Issue', 'MergeRequest'], context: 'labels')
     taggings.find_each(batch_size: 500) do |tagging|
diff --git a/db/migrate/20140730111702_add_index_to_labels.rb b/db/migrate/20140730111702_add_index_to_labels.rb
index cc7ac1fc449..21f9dfd5d47 100644
--- a/db/migrate/20140730111702_add_index_to_labels.rb
+++ b/db/migrate/20140730111702_add_index_to_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexToLabels < ActiveRecord::Migration
+class AddIndexToLabels < ActiveRecord::Migration[4.2]
   def change
     add_index "labels", :project_id
     add_index "label_links", :label_id
diff --git a/db/migrate/20140903115954_migrate_to_new_shell.rb b/db/migrate/20140903115954_migrate_to_new_shell.rb
index 04acf24284b..cc0cce483b1 100644
--- a/db/migrate/20140903115954_migrate_to_new_shell.rb
+++ b/db/migrate/20140903115954_migrate_to_new_shell.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateToNewShell < ActiveRecord::Migration
+class MigrateToNewShell < ActiveRecord::Migration[4.2]
   def change
     return if Rails.env.test?
 
diff --git a/db/migrate/20140907220153_serialize_service_properties.rb b/db/migrate/20140907220153_serialize_service_properties.rb
index c2d67fad0ab..bf94c64654b 100644
--- a/db/migrate/20140907220153_serialize_service_properties.rb
+++ b/db/migrate/20140907220153_serialize_service_properties.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class SerializeServiceProperties < ActiveRecord::Migration
+class SerializeServiceProperties < ActiveRecord::Migration[4.2]
   def change
     unless column_exists?(:services, :properties)
       add_column :services, :properties, :text
diff --git a/db/migrate/20140914113604_add_members_table.rb b/db/migrate/20140914113604_add_members_table.rb
index 0f76bb0ef79..312ea1b94df 100644
--- a/db/migrate/20140914113604_add_members_table.rb
+++ b/db/migrate/20140914113604_add_members_table.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddMembersTable < ActiveRecord::Migration
+class AddMembersTable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20140914145549_migrate_to_new_members_model.rb b/db/migrate/20140914145549_migrate_to_new_members_model.rb
index b4c98f016d0..22d8b3d651b 100644
--- a/db/migrate/20140914145549_migrate_to_new_members_model.rb
+++ b/db/migrate/20140914145549_migrate_to_new_members_model.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateToNewMembersModel < ActiveRecord::Migration
+class MigrateToNewMembersModel < ActiveRecord::Migration[4.2]
   def up
     execute "INSERT INTO members ( user_id, source_id, source_type, access_level, notification_level, type ) SELECT user_id, group_id, 'Namespace', group_access, notification_level, 'GroupMember' FROM users_groups"
     execute "INSERT INTO members ( user_id, source_id, source_type, access_level, notification_level, type ) SELECT user_id, project_id, 'Project', project_access, notification_level, 'ProjectMember' FROM users_projects"
diff --git a/db/migrate/20140914173417_remove_old_member_tables.rb b/db/migrate/20140914173417_remove_old_member_tables.rb
index d2ab326ef1f..edd69caa470 100644
--- a/db/migrate/20140914173417_remove_old_member_tables.rb
+++ b/db/migrate/20140914173417_remove_old_member_tables.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveOldMemberTables < ActiveRecord::Migration
+class RemoveOldMemberTables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20141006143943_move_slack_service_to_webhook.rb b/db/migrate/20141006143943_move_slack_service_to_webhook.rb
index 561184615cc..1c9a1a74a4e 100644
--- a/db/migrate/20141006143943_move_slack_service_to_webhook.rb
+++ b/db/migrate/20141006143943_move_slack_service_to_webhook.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MoveSlackServiceToWebhook < ActiveRecord::Migration
+class MoveSlackServiceToWebhook < ActiveRecord::Migration[4.2]
 
   DOWNTIME = true
   DOWNTIME_REASON = 'Move old fields "token" and "subdomain" to one single field "webhook"'
diff --git a/db/migrate/20141007100818_add_visibility_level_to_snippet.rb b/db/migrate/20141007100818_add_visibility_level_to_snippet.rb
index 0c14f75c154..9501aed8931 100644
--- a/db/migrate/20141007100818_add_visibility_level_to_snippet.rb
+++ b/db/migrate/20141007100818_add_visibility_level_to_snippet.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddVisibilityLevelToSnippet < ActiveRecord::Migration
+class AddVisibilityLevelToSnippet < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20141118150935_add_audit_event.rb b/db/migrate/20141118150935_add_audit_event.rb
index 52d70b4a0ac..1e7dba568c9 100644
--- a/db/migrate/20141118150935_add_audit_event.rb
+++ b/db/migrate/20141118150935_add_audit_event.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddAuditEvent < ActiveRecord::Migration
+class AddAuditEvent < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20141121133009_add_timestamps_to_members.rb b/db/migrate/20141121133009_add_timestamps_to_members.rb
index ef6d4dedf32..cb575fc9ed7 100644
--- a/db/migrate/20141121133009_add_timestamps_to_members.rb
+++ b/db/migrate/20141121133009_add_timestamps_to_members.rb
@@ -3,7 +3,7 @@
 # became a problem after commit c8e78d972a5a628870eefca0f2ccea0199c55bda which
 # was added in GitLab 7.5. With this migration we ensure that all rows in
 # 'members' have at least some created_at and updated_at timestamp.
-class AddTimestampsToMembers < ActiveRecord::Migration
+class AddTimestampsToMembers < ActiveRecord::Migration[4.2]
   def up
     execute "UPDATE members SET created_at = NOW() WHERE created_at is NULL"
     execute "UPDATE members SET updated_at = NOW() WHERE updated_at is NULL"
diff --git a/db/migrate/20141121161704_add_identity_table.rb b/db/migrate/20141121161704_add_identity_table.rb
index 5a399f0d325..92f7a568077 100644
--- a/db/migrate/20141121161704_add_identity_table.rb
+++ b/db/migrate/20141121161704_add_identity_table.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIdentityTable < ActiveRecord::Migration
+class AddIdentityTable < ActiveRecord::Migration[4.2]
   def up
     create_table :identities do |t|
       t.string :extern_uid
diff --git a/db/migrate/20141126120926_add_merge_request_rebase_enabled_to_projects.rb b/db/migrate/20141126120926_add_merge_request_rebase_enabled_to_projects.rb
index 3dafdf0fde4..b9d8a5cb435 100644
--- a/db/migrate/20141126120926_add_merge_request_rebase_enabled_to_projects.rb
+++ b/db/migrate/20141126120926_add_merge_request_rebase_enabled_to_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddMergeRequestRebaseEnabledToProjects < ActiveRecord::Migration
+class AddMergeRequestRebaseEnabledToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20141205134006_add_locked_at_to_merge_request.rb b/db/migrate/20141205134006_add_locked_at_to_merge_request.rb
index 5aa91c7587a..6fdfb3eb974 100644
--- a/db/migrate/20141205134006_add_locked_at_to_merge_request.rb
+++ b/db/migrate/20141205134006_add_locked_at_to_merge_request.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddLockedAtToMergeRequest < ActiveRecord::Migration
+class AddLockedAtToMergeRequest < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :locked_at, :datetime
   end
diff --git a/db/migrate/20141216155758_create_doorkeeper_tables.rb b/db/migrate/20141216155758_create_doorkeeper_tables.rb
index 17e45a77291..7bd0a15e7f5 100644
--- a/db/migrate/20141216155758_create_doorkeeper_tables.rb
+++ b/db/migrate/20141216155758_create_doorkeeper_tables.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateDoorkeeperTables < ActiveRecord::Migration
+class CreateDoorkeeperTables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20141217125223_add_owner_to_application.rb b/db/migrate/20141217125223_add_owner_to_application.rb
index e5a669ab4d8..482a53f3ad5 100644
--- a/db/migrate/20141217125223_add_owner_to_application.rb
+++ b/db/migrate/20141217125223_add_owner_to_application.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddOwnerToApplication < ActiveRecord::Migration
+class AddOwnerToApplication < ActiveRecord::Migration[4.2]
   def change
     add_column :oauth_applications, :owner_id, :integer, null: true
     add_column :oauth_applications, :owner_type, :string, null: true
diff --git a/db/migrate/20141223135007_add_import_data_to_project_table.rb b/db/migrate/20141223135007_add_import_data_to_project_table.rb
index 5db78f94cc9..516f58d645e 100644
--- a/db/migrate/20141223135007_add_import_data_to_project_table.rb
+++ b/db/migrate/20141223135007_add_import_data_to_project_table.rb
@@ -1,4 +1,4 @@
-class AddImportDataToProjectTable < ActiveRecord::Migration
+class AddImportDataToProjectTable < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :import_type, :string
     add_column :projects, :import_source, :string
diff --git a/db/migrate/20141226080412_add_developers_can_push_to_protected_branches.rb b/db/migrate/20141226080412_add_developers_can_push_to_protected_branches.rb
index a18b2f4974d..43b7de85228 100644
--- a/db/migrate/20141226080412_add_developers_can_push_to_protected_branches.rb
+++ b/db/migrate/20141226080412_add_developers_can_push_to_protected_branches.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDevelopersCanPushToProtectedBranches < ActiveRecord::Migration
+class AddDevelopersCanPushToProtectedBranches < ActiveRecord::Migration[4.2]
   def change
     add_column :protected_branches, :developers_can_push, :boolean, default: false, null: false
   end
diff --git a/db/migrate/20150108073740_create_application_settings.rb b/db/migrate/20150108073740_create_application_settings.rb
index 0e4c66ca8c0..be139fee63a 100644
--- a/db/migrate/20150108073740_create_application_settings.rb
+++ b/db/migrate/20150108073740_create_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateApplicationSettings < ActiveRecord::Migration
+class CreateApplicationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20150116234544_add_home_page_url_for_application_settings.rb b/db/migrate/20150116234544_add_home_page_url_for_application_settings.rb
index aa179ce3a4d..e630e2cc878 100644
--- a/db/migrate/20150116234544_add_home_page_url_for_application_settings.rb
+++ b/db/migrate/20150116234544_add_home_page_url_for_application_settings.rb
@@ -1,4 +1,4 @@
-class AddHomePageUrlForApplicationSettings < ActiveRecord::Migration
+class AddHomePageUrlForApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :home_page_url, :string
   end
diff --git a/db/migrate/20150116234545_add_gitlab_access_token_to_user.rb b/db/migrate/20150116234545_add_gitlab_access_token_to_user.rb
index c28ba3197ac..673628e106b 100644
--- a/db/migrate/20150116234545_add_gitlab_access_token_to_user.rb
+++ b/db/migrate/20150116234545_add_gitlab_access_token_to_user.rb
@@ -1,4 +1,4 @@
-class AddGitlabAccessTokenToUser < ActiveRecord::Migration
+class AddGitlabAccessTokenToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :gitlab_access_token, :string
   end
diff --git a/db/migrate/20150125163100_add_default_branch_protection_setting.rb b/db/migrate/20150125163100_add_default_branch_protection_setting.rb
index 7ca3116d354..f6bfa422124 100644
--- a/db/migrate/20150125163100_add_default_branch_protection_setting.rb
+++ b/db/migrate/20150125163100_add_default_branch_protection_setting.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDefaultBranchProtectionSetting < ActiveRecord::Migration
+class AddDefaultBranchProtectionSetting < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :default_branch_protection, :integer, :default => 2
   end
diff --git a/db/migrate/20150205211843_add_timestamps_to_identities.rb b/db/migrate/20150205211843_add_timestamps_to_identities.rb
index a78e28eb4eb..c535a7ec781 100644
--- a/db/migrate/20150205211843_add_timestamps_to_identities.rb
+++ b/db/migrate/20150205211843_add_timestamps_to_identities.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTimestampsToIdentities < ActiveRecord::Migration
+class AddTimestampsToIdentities < ActiveRecord::Migration[4.2]
   def change
     add_timestamps(:identities)
   end
diff --git a/db/migrate/20150206181414_add_index_to_created_at.rb b/db/migrate/20150206181414_add_index_to_created_at.rb
index a161fad79dc..501acd6a720 100644
--- a/db/migrate/20150206181414_add_index_to_created_at.rb
+++ b/db/migrate/20150206181414_add_index_to_created_at.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexToCreatedAt < ActiveRecord::Migration
+class AddIndexToCreatedAt < ActiveRecord::Migration[4.2]
   def change
     add_index "users", [:created_at, :id]
     add_index "members", [:created_at, :id]
diff --git a/db/migrate/20150206222854_add_notification_email_to_user.rb b/db/migrate/20150206222854_add_notification_email_to_user.rb
index ab80f7e582f..7b0c251db4f 100644
--- a/db/migrate/20150206222854_add_notification_email_to_user.rb
+++ b/db/migrate/20150206222854_add_notification_email_to_user.rb
@@ -1,4 +1,4 @@
-class AddNotificationEmailToUser < ActiveRecord::Migration
+class AddNotificationEmailToUser < ActiveRecord::Migration[4.2]
   def up
     add_column :users, :notification_email, :string
 
diff --git a/db/migrate/20150209222013_add_missing_index.rb b/db/migrate/20150209222013_add_missing_index.rb
index 18e3ac2cbbb..99544ab3928 100644
--- a/db/migrate/20150209222013_add_missing_index.rb
+++ b/db/migrate/20150209222013_add_missing_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddMissingIndex < ActiveRecord::Migration
+class AddMissingIndex < ActiveRecord::Migration[4.2]
   def change
     add_index "services", [:created_at, :id]
   end
diff --git a/db/migrate/20150211172122_add_template_to_service.rb b/db/migrate/20150211172122_add_template_to_service.rb
index a3e96b25c56..dd192a0fe76 100644
--- a/db/migrate/20150211172122_add_template_to_service.rb
+++ b/db/migrate/20150211172122_add_template_to_service.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTemplateToService < ActiveRecord::Migration
+class AddTemplateToService < ActiveRecord::Migration[4.2]
   def change
     add_column :services, :template, :boolean, default: false
   end
diff --git a/db/migrate/20150211174341_allow_null_in_services_project_id.rb b/db/migrate/20150211174341_allow_null_in_services_project_id.rb
index 68f02812791..4c90bf9c419 100644
--- a/db/migrate/20150211174341_allow_null_in_services_project_id.rb
+++ b/db/migrate/20150211174341_allow_null_in_services_project_id.rb
@@ -1,4 +1,4 @@
-class AllowNullInServicesProjectId < ActiveRecord::Migration
+class AllowNullInServicesProjectId < ActiveRecord::Migration[4.2]
   def change
     change_column :services, :project_id, :integer, null: true
   end
diff --git a/db/migrate/20150213104043_add_twitter_sharing_enabled_to_application_settings.rb b/db/migrate/20150213104043_add_twitter_sharing_enabled_to_application_settings.rb
index 334020376e4..7d7b9242cd6 100644
--- a/db/migrate/20150213104043_add_twitter_sharing_enabled_to_application_settings.rb
+++ b/db/migrate/20150213104043_add_twitter_sharing_enabled_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTwitterSharingEnabledToApplicationSettings < ActiveRecord::Migration
+class AddTwitterSharingEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :twitter_sharing_enabled, :boolean, default: true
   end
diff --git a/db/migrate/20150213114800_add_hide_no_password_to_user.rb b/db/migrate/20150213114800_add_hide_no_password_to_user.rb
index a2af3510b9c..348c0d22aba 100644
--- a/db/migrate/20150213114800_add_hide_no_password_to_user.rb
+++ b/db/migrate/20150213114800_add_hide_no_password_to_user.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddHideNoPasswordToUser < ActiveRecord::Migration
+class AddHideNoPasswordToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :hide_no_password, :boolean, default: false
   end
diff --git a/db/migrate/20150213121042_add_password_automatically_set_to_user.rb b/db/migrate/20150213121042_add_password_automatically_set_to_user.rb
index 4e84a13f0d2..d0eb753b887 100644
--- a/db/migrate/20150213121042_add_password_automatically_set_to_user.rb
+++ b/db/migrate/20150213121042_add_password_automatically_set_to_user.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPasswordAutomaticallySetToUser < ActiveRecord::Migration
+class AddPasswordAutomaticallySetToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :password_automatically_set, :boolean, default: false
   end
diff --git a/db/migrate/20150217123345_add_bitbucket_access_token_and_secret_to_user.rb b/db/migrate/20150217123345_add_bitbucket_access_token_and_secret_to_user.rb
index 23ac1b399ec..639644174ca 100644
--- a/db/migrate/20150217123345_add_bitbucket_access_token_and_secret_to_user.rb
+++ b/db/migrate/20150217123345_add_bitbucket_access_token_and_secret_to_user.rb
@@ -1,4 +1,4 @@
-class AddBitbucketAccessTokenAndSecretToUser < ActiveRecord::Migration
+class AddBitbucketAccessTokenAndSecretToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :bitbucket_access_token, :string
     add_column :users, :bitbucket_access_token_secret, :string
diff --git a/db/migrate/20150219004514_add_events_to_services.rb b/db/migrate/20150219004514_add_events_to_services.rb
index 560382c3fa1..7072056adcb 100644
--- a/db/migrate/20150219004514_add_events_to_services.rb
+++ b/db/migrate/20150219004514_add_events_to_services.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddEventsToServices < ActiveRecord::Migration
+class AddEventsToServices < ActiveRecord::Migration[4.2]
   def change
     add_column :services, :push_events, :boolean, :default => true
     add_column :services, :issues_events, :boolean, :default => true
diff --git a/db/migrate/20150223022001_set_missing_last_activity_at.rb b/db/migrate/20150223022001_set_missing_last_activity_at.rb
index 3f6d4d83474..c77ffbd4ebd 100644
--- a/db/migrate/20150223022001_set_missing_last_activity_at.rb
+++ b/db/migrate/20150223022001_set_missing_last_activity_at.rb
@@ -1,4 +1,4 @@
-class SetMissingLastActivityAt < ActiveRecord::Migration
+class SetMissingLastActivityAt < ActiveRecord::Migration[4.2]
   def up
     execute "UPDATE projects SET last_activity_at = updated_at WHERE last_activity_at IS NULL"
   end
diff --git a/db/migrate/20150225065047_add_note_events_to_services.rb b/db/migrate/20150225065047_add_note_events_to_services.rb
index 7843cabc43b..32c538e8681 100644
--- a/db/migrate/20150225065047_add_note_events_to_services.rb
+++ b/db/migrate/20150225065047_add_note_events_to_services.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddNoteEventsToServices < ActiveRecord::Migration
+class AddNoteEventsToServices < ActiveRecord::Migration[4.2]
   def change
     add_column :services, :note_events, :boolean, default: true, null: false
   end
diff --git a/db/migrate/20150301014758_add_restricted_visibility_levels_to_application_settings.rb b/db/migrate/20150301014758_add_restricted_visibility_levels_to_application_settings.rb
index 494c3033bff..3091790f199 100644
--- a/db/migrate/20150301014758_add_restricted_visibility_levels_to_application_settings.rb
+++ b/db/migrate/20150301014758_add_restricted_visibility_levels_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddRestrictedVisibilityLevelsToApplicationSettings < ActiveRecord::Migration
+class AddRestrictedVisibilityLevelsToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :restricted_visibility_levels, :text
   end
diff --git a/db/migrate/20150306023106_fix_namespace_duplication.rb b/db/migrate/20150306023106_fix_namespace_duplication.rb
index ea53a9d71f2..49be152a75c 100644
--- a/db/migrate/20150306023106_fix_namespace_duplication.rb
+++ b/db/migrate/20150306023106_fix_namespace_duplication.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class FixNamespaceDuplication < ActiveRecord::Migration
+class FixNamespaceDuplication < ActiveRecord::Migration[4.2]
   def up
     #fixes path duplication
     select_all('SELECT MAX(id) max, COUNT(id) cnt, path FROM namespaces GROUP BY path HAVING COUNT(id) > 1').each do |nms|
diff --git a/db/migrate/20150306023112_add_unique_index_to_namespace.rb b/db/migrate/20150306023112_add_unique_index_to_namespace.rb
index f293a9b643f..11472324cbf 100644
--- a/db/migrate/20150306023112_add_unique_index_to_namespace.rb
+++ b/db/migrate/20150306023112_add_unique_index_to_namespace.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddUniqueIndexToNamespace < ActiveRecord::Migration
+class AddUniqueIndexToNamespace < ActiveRecord::Migration[4.2]
   def change
     remove_index :namespaces, column: :name if index_exists?(:namespaces, :name)
     remove_index :namespaces, column: :path if index_exists?(:namespaces, :path)
diff --git a/db/migrate/20150310194358_add_version_check_to_application_settings.rb b/db/migrate/20150310194358_add_version_check_to_application_settings.rb
index 5d3dae6e7d8..cc1b19f302e 100644
--- a/db/migrate/20150310194358_add_version_check_to_application_settings.rb
+++ b/db/migrate/20150310194358_add_version_check_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddVersionCheckToApplicationSettings < ActiveRecord::Migration
+class AddVersionCheckToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :version_check_enabled, :boolean, default: true
   end
diff --git a/db/migrate/20150313012111_create_subscriptions_table.rb b/db/migrate/20150313012111_create_subscriptions_table.rb
index a9a8435330d..37011504b49 100644
--- a/db/migrate/20150313012111_create_subscriptions_table.rb
+++ b/db/migrate/20150313012111_create_subscriptions_table.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateSubscriptionsTable < ActiveRecord::Migration
+class CreateSubscriptionsTable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20150320234437_add_location_to_user.rb b/db/migrate/20150320234437_add_location_to_user.rb
index 32731d37d75..cf273ff916e 100644
--- a/db/migrate/20150320234437_add_location_to_user.rb
+++ b/db/migrate/20150320234437_add_location_to_user.rb
@@ -1,4 +1,4 @@
-class AddLocationToUser < ActiveRecord::Migration
+class AddLocationToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :location, :string
   end
diff --git a/db/migrate/20150324155957_set_incorrect_assignee_id_to_null.rb b/db/migrate/20150324155957_set_incorrect_assignee_id_to_null.rb
index 42dc8173e46..a895d5f24f5 100644
--- a/db/migrate/20150324155957_set_incorrect_assignee_id_to_null.rb
+++ b/db/migrate/20150324155957_set_incorrect_assignee_id_to_null.rb
@@ -1,4 +1,4 @@
-class SetIncorrectAssigneeIdToNull < ActiveRecord::Migration
+class SetIncorrectAssigneeIdToNull < ActiveRecord::Migration[4.2]
   def up
     execute "UPDATE issues SET assignee_id = NULL WHERE assignee_id = -1"
     execute "UPDATE merge_requests SET assignee_id = NULL WHERE assignee_id = -1"
diff --git a/db/migrate/20150327122227_add_public_to_key.rb b/db/migrate/20150327122227_add_public_to_key.rb
index 33c20d65e03..58d8c16476f 100644
--- a/db/migrate/20150327122227_add_public_to_key.rb
+++ b/db/migrate/20150327122227_add_public_to_key.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPublicToKey < ActiveRecord::Migration
+class AddPublicToKey < ActiveRecord::Migration[4.2]
   def change
     add_column :keys, :public, :boolean, default: false, null: false
   end
diff --git a/db/migrate/20150327150017_add_import_data_to_project.rb b/db/migrate/20150327150017_add_import_data_to_project.rb
index 12c00339eec..5d393364ee6 100644
--- a/db/migrate/20150327150017_add_import_data_to_project.rb
+++ b/db/migrate/20150327150017_add_import_data_to_project.rb
@@ -1,4 +1,4 @@
-class AddImportDataToProject < ActiveRecord::Migration
+class AddImportDataToProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :import_data, :text
   end
diff --git a/db/migrate/20150327223628_add_devise_two_factor_to_users.rb b/db/migrate/20150327223628_add_devise_two_factor_to_users.rb
index 11b026ee8f3..22202796547 100644
--- a/db/migrate/20150327223628_add_devise_two_factor_to_users.rb
+++ b/db/migrate/20150327223628_add_devise_two_factor_to_users.rb
@@ -1,4 +1,4 @@
-class AddDeviseTwoFactorToUsers < ActiveRecord::Migration
+class AddDeviseTwoFactorToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :encrypted_otp_secret, :string
     add_column :users, :encrypted_otp_secret_iv, :string
diff --git a/db/migrate/20150328132231_add_max_attachment_size_to_application_settings.rb b/db/migrate/20150328132231_add_max_attachment_size_to_application_settings.rb
index 1d161674a9a..4ce60a257cb 100644
--- a/db/migrate/20150328132231_add_max_attachment_size_to_application_settings.rb
+++ b/db/migrate/20150328132231_add_max_attachment_size_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddMaxAttachmentSizeToApplicationSettings < ActiveRecord::Migration
+class AddMaxAttachmentSizeToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :max_attachment_size, :integer, default: 10, null: false
   end
diff --git a/db/migrate/20150331183602_add_devise_two_factor_backupable_to_users.rb b/db/migrate/20150331183602_add_devise_two_factor_backupable_to_users.rb
index 913958db7c5..792b98c91f0 100644
--- a/db/migrate/20150331183602_add_devise_two_factor_backupable_to_users.rb
+++ b/db/migrate/20150331183602_add_devise_two_factor_backupable_to_users.rb
@@ -1,4 +1,4 @@
-class AddDeviseTwoFactorBackupableToUsers < ActiveRecord::Migration
+class AddDeviseTwoFactorBackupableToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :otp_backup_codes, :text
   end
diff --git a/db/migrate/20150406133311_add_invite_data_to_member.rb b/db/migrate/20150406133311_add_invite_data_to_member.rb
index 63d0f184f32..eee991185ab 100644
--- a/db/migrate/20150406133311_add_invite_data_to_member.rb
+++ b/db/migrate/20150406133311_add_invite_data_to_member.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddInviteDataToMember < ActiveRecord::Migration
+class AddInviteDataToMember < ActiveRecord::Migration[4.2]
   def up
     add_column :members, :created_by_id, :integer
     add_column :members, :invite_email, :string
diff --git a/db/migrate/20150411000035_fix_identities.rb b/db/migrate/20150411000035_fix_identities.rb
index d9051f9fffd..a449fc51ecc 100644
--- a/db/migrate/20150411000035_fix_identities.rb
+++ b/db/migrate/20150411000035_fix_identities.rb
@@ -1,4 +1,4 @@
-class FixIdentities < ActiveRecord::Migration
+class FixIdentities < ActiveRecord::Migration[4.2]
   def up
     # Up until now, legacy 'ldap' references in the database were charitably
     # interpreted to point to the first LDAP server specified in the GitLab
diff --git a/db/migrate/20150411180045_rename_buildbox_service.rb b/db/migrate/20150411180045_rename_buildbox_service.rb
index 5a0b5d07e50..ac4ccdfb723 100644
--- a/db/migrate/20150411180045_rename_buildbox_service.rb
+++ b/db/migrate/20150411180045_rename_buildbox_service.rb
@@ -1,4 +1,4 @@
-class RenameBuildboxService < ActiveRecord::Migration
+class RenameBuildboxService < ActiveRecord::Migration[4.2]
   def up
     execute "UPDATE services SET type = 'BuildkiteService' WHERE type = 'BuildboxService';"
   end
diff --git a/db/migrate/20150413192223_add_public_email_to_users.rb b/db/migrate/20150413192223_add_public_email_to_users.rb
index 0fed5eaf461..991f0c668c3 100644
--- a/db/migrate/20150413192223_add_public_email_to_users.rb
+++ b/db/migrate/20150413192223_add_public_email_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPublicEmailToUsers < ActiveRecord::Migration
+class AddPublicEmailToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :public_email, :string, default: "", null: false
   end
diff --git a/db/migrate/20150417121913_create_project_import_data.rb b/db/migrate/20150417121913_create_project_import_data.rb
index c78f5fde85e..383f64fd2c6 100644
--- a/db/migrate/20150417121913_create_project_import_data.rb
+++ b/db/migrate/20150417121913_create_project_import_data.rb
@@ -1,4 +1,4 @@
-class CreateProjectImportData < ActiveRecord::Migration
+class CreateProjectImportData < ActiveRecord::Migration[4.2]
   def change
     create_table :project_import_data do |t|
       t.references :project
diff --git a/db/migrate/20150417122318_remove_import_data_from_project.rb b/db/migrate/20150417122318_remove_import_data_from_project.rb
index 5a008218fa5..c9a225a9d17 100644
--- a/db/migrate/20150417122318_remove_import_data_from_project.rb
+++ b/db/migrate/20150417122318_remove_import_data_from_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveImportDataFromProject < ActiveRecord::Migration
+class RemoveImportDataFromProject < ActiveRecord::Migration[4.2]
   def up
     remove_column :projects, :import_data
   end
diff --git a/db/migrate/20150421120000_remove_periods_at_ends_of_usernames.rb b/db/migrate/20150421120000_remove_periods_at_ends_of_usernames.rb
index 3445e9ce59e..d2e7656c9d4 100644
--- a/db/migrate/20150421120000_remove_periods_at_ends_of_usernames.rb
+++ b/db/migrate/20150421120000_remove_periods_at_ends_of_usernames.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemovePeriodsAtEndsOfUsernames < ActiveRecord::Migration
+class RemovePeriodsAtEndsOfUsernames < ActiveRecord::Migration[4.2]
   include Gitlab::ShellAdapter
 
   class Namespace < ActiveRecord::Base
diff --git a/db/migrate/20150423033240_add_default_project_visibililty_to_application_settings.rb b/db/migrate/20150423033240_add_default_project_visibililty_to_application_settings.rb
index 50a9b2439e0..e0f35da422a 100644
--- a/db/migrate/20150423033240_add_default_project_visibililty_to_application_settings.rb
+++ b/db/migrate/20150423033240_add_default_project_visibililty_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddDefaultProjectVisibililtyToApplicationSettings < ActiveRecord::Migration
+class AddDefaultProjectVisibililtyToApplicationSettings < ActiveRecord::Migration[4.2]
   def up
     add_column :application_settings, :default_project_visibility, :integer
     visibility = Settings.gitlab.default_projects_features['visibility_level']
diff --git a/db/migrate/20150425164646_gitlab_change_collation_for_tag_names.acts_as_taggable_on_engine.rb b/db/migrate/20150425164646_gitlab_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
index 281c88d2a7d..5b2e692eb17 100644
--- a/db/migrate/20150425164646_gitlab_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20150425164646_gitlab_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
@@ -1,7 +1,7 @@
 # This migration is a duplicate of 20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
 # It shold be applied before the index additions to ensure that `name` is case sensitive.
 
-class GitlabChangeCollationForTagNames < ActiveRecord::Migration
+class GitlabChangeCollationForTagNames < ActiveRecord::Migration[4.2]
   def up
     if ActsAsTaggableOn::Utils.using_mysql?
       execute("ALTER TABLE tags MODIFY name varchar(255) CHARACTER SET utf8 COLLATE utf8_bin;")
diff --git a/db/migrate/20150425164647_remove_duplicate_tags.rb b/db/migrate/20150425164647_remove_duplicate_tags.rb
index e77623bf507..5165eb65695 100644
--- a/db/migrate/20150425164647_remove_duplicate_tags.rb
+++ b/db/migrate/20150425164647_remove_duplicate_tags.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveDuplicateTags < ActiveRecord::Migration
+class RemoveDuplicateTags < ActiveRecord::Migration[4.2]
   def up
     select_all("SELECT name, COUNT(id) as cnt FROM tags GROUP BY name HAVING COUNT(id) > 1").each do |tag|
       tag_name = quote_string(tag["name"])
diff --git a/db/migrate/20150425164648_add_missing_unique_indices.acts_as_taggable_on_engine.rb b/db/migrate/20150425164648_add_missing_unique_indices.acts_as_taggable_on_engine.rb
index cbff98cdbc4..d1951f640bb 100644
--- a/db/migrate/20150425164648_add_missing_unique_indices.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20150425164648_add_missing_unique_indices.acts_as_taggable_on_engine.rb
@@ -1,6 +1,6 @@
 # rubocop:disable all
 # This migration comes from acts_as_taggable_on_engine (originally 2)
-class AddMissingUniqueIndices < ActiveRecord::Migration
+class AddMissingUniqueIndices < ActiveRecord::Migration[4.2]
   def self.up
     add_index :tags, :name, unique: true
 
diff --git a/db/migrate/20150425164649_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb b/db/migrate/20150425164649_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
index 1568d2dd4ce..b9af394f09b 100644
--- a/db/migrate/20150425164649_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20150425164649_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
@@ -1,6 +1,6 @@
 # rubocop:disable all
 # This migration comes from acts_as_taggable_on_engine (originally 3)
-class AddTaggingsCounterCacheToTags < ActiveRecord::Migration
+class AddTaggingsCounterCacheToTags < ActiveRecord::Migration[4.2]
   def self.up
     add_column :tags, :taggings_count, :integer, default: 0
 
diff --git a/db/migrate/20150425164650_add_missing_taggable_index.acts_as_taggable_on_engine.rb b/db/migrate/20150425164650_add_missing_taggable_index.acts_as_taggable_on_engine.rb
index 71f2d7f4330..f28737615d7 100644
--- a/db/migrate/20150425164650_add_missing_taggable_index.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20150425164650_add_missing_taggable_index.acts_as_taggable_on_engine.rb
@@ -1,5 +1,5 @@
 # This migration comes from acts_as_taggable_on_engine (originally 4)
-class AddMissingTaggableIndex < ActiveRecord::Migration
+class AddMissingTaggableIndex < ActiveRecord::Migration[4.2]
   def self.up
     add_index :taggings, [:taggable_id, :taggable_type, :context]
   end
diff --git a/db/migrate/20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb b/db/migrate/20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
index bfb06bc7cda..4c144a8693f 100644
--- a/db/migrate/20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
@@ -1,7 +1,7 @@
 # This migration comes from acts_as_taggable_on_engine (originally 5)
 # This migration is added to circumvent issue #623 and have special characters
 # work properly
-class ChangeCollationForTagNames < ActiveRecord::Migration
+class ChangeCollationForTagNames < ActiveRecord::Migration[4.2]
   def up
     if ActsAsTaggableOn::Utils.using_mysql?
       execute("ALTER TABLE tags MODIFY name varchar(255) CHARACTER SET utf8 COLLATE utf8_bin;")
diff --git a/db/migrate/20150425173433_add_default_snippet_visibility_to_app_settings.rb b/db/migrate/20150425173433_add_default_snippet_visibility_to_app_settings.rb
index 8f1b0cc8935..a3a86d26767 100644
--- a/db/migrate/20150425173433_add_default_snippet_visibility_to_app_settings.rb
+++ b/db/migrate/20150425173433_add_default_snippet_visibility_to_app_settings.rb
@@ -1,4 +1,4 @@
-class AddDefaultSnippetVisibilityToAppSettings < ActiveRecord::Migration
+class AddDefaultSnippetVisibilityToAppSettings < ActiveRecord::Migration[4.2]
   def up
     add_column :application_settings, :default_snippet_visibility, :integer
     visibility = Settings.gitlab.default_projects_features['visibility_level']
diff --git a/db/migrate/20150429002313_remove_abandoned_group_members_records.rb b/db/migrate/20150429002313_remove_abandoned_group_members_records.rb
index 244637e1c4a..370b807dd50 100644
--- a/db/migrate/20150429002313_remove_abandoned_group_members_records.rb
+++ b/db/migrate/20150429002313_remove_abandoned_group_members_records.rb
@@ -1,4 +1,4 @@
-class RemoveAbandonedGroupMembersRecords < ActiveRecord::Migration
+class RemoveAbandonedGroupMembersRecords < ActiveRecord::Migration[4.2]
   def up
     execute("DELETE FROM members WHERE type = 'GroupMember' AND source_id NOT IN(\
         SELECT id FROM namespaces WHERE type='Group')")
diff --git a/db/migrate/20150502064022_add_restricted_signup_domains_to_application_settings.rb b/db/migrate/20150502064022_add_restricted_signup_domains_to_application_settings.rb
index 184e2653610..df777263ecb 100644
--- a/db/migrate/20150502064022_add_restricted_signup_domains_to_application_settings.rb
+++ b/db/migrate/20150502064022_add_restricted_signup_domains_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddRestrictedSignupDomainsToApplicationSettings < ActiveRecord::Migration
+class AddRestrictedSignupDomainsToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :restricted_signup_domains, :text
   end
diff --git a/db/migrate/20150509180749_convert_legacy_reference_notes.rb b/db/migrate/20150509180749_convert_legacy_reference_notes.rb
index b02605489be..a44a908c2f5 100644
--- a/db/migrate/20150509180749_convert_legacy_reference_notes.rb
+++ b/db/migrate/20150509180749_convert_legacy_reference_notes.rb
@@ -5,7 +5,7 @@
 # becomes
 #
 #   mentioned in 54f7727c850972f0401c1312a7c4a6a380de5666
-class ConvertLegacyReferenceNotes < ActiveRecord::Migration
+class ConvertLegacyReferenceNotes < ActiveRecord::Migration[4.2]
   def up
     execute %q{UPDATE notes SET note = trim(both '_' from note) WHERE system = true AND note LIKE '\_%\_'}
   end
diff --git a/db/migrate/20150516060434_add_note_events_to_web_hooks.rb b/db/migrate/20150516060434_add_note_events_to_web_hooks.rb
index bf72e5e2e3a..ddf26240b8b 100644
--- a/db/migrate/20150516060434_add_note_events_to_web_hooks.rb
+++ b/db/migrate/20150516060434_add_note_events_to_web_hooks.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddNoteEventsToWebHooks < ActiveRecord::Migration
+class AddNoteEventsToWebHooks < ActiveRecord::Migration[4.2]
   def up
     add_column :web_hooks, :note_events, :boolean, default: false, null: false
   end
diff --git a/db/migrate/20150529111607_add_user_oauth_applications_to_application_settings.rb b/db/migrate/20150529111607_add_user_oauth_applications_to_application_settings.rb
index 6a78294f0b2..507e905acd6 100644
--- a/db/migrate/20150529111607_add_user_oauth_applications_to_application_settings.rb
+++ b/db/migrate/20150529111607_add_user_oauth_applications_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddUserOauthApplicationsToApplicationSettings < ActiveRecord::Migration
+class AddUserOauthApplicationsToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :user_oauth_applications, :bool, default: true
   end
diff --git a/db/migrate/20150529150354_add_after_sign_out_path_for_application_settings.rb b/db/migrate/20150529150354_add_after_sign_out_path_for_application_settings.rb
index 833c36de52d..f43f20def5b 100644
--- a/db/migrate/20150529150354_add_after_sign_out_path_for_application_settings.rb
+++ b/db/migrate/20150529150354_add_after_sign_out_path_for_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddAfterSignOutPathForApplicationSettings < ActiveRecord::Migration
+class AddAfterSignOutPathForApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :after_sign_out_path, :string
   end
diff --git a/db/migrate/20150609141121_add_session_expire_delay_for_application_settings.rb b/db/migrate/20150609141121_add_session_expire_delay_for_application_settings.rb
index 61ff0af41f4..93959a9010f 100644
--- a/db/migrate/20150609141121_add_session_expire_delay_for_application_settings.rb
+++ b/db/migrate/20150609141121_add_session_expire_delay_for_application_settings.rb
@@ -1,4 +1,4 @@
-class AddSessionExpireDelayForApplicationSettings < ActiveRecord::Migration
+class AddSessionExpireDelayForApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     unless column_exists?(:application_settings, :session_expire_delay)
       add_column :application_settings, :session_expire_delay, :integer, default: 10080, null: false
diff --git a/db/migrate/20150610065936_add_dashboard_to_users.rb b/db/migrate/20150610065936_add_dashboard_to_users.rb
index df38472f893..a0bf5f31f00 100644
--- a/db/migrate/20150610065936_add_dashboard_to_users.rb
+++ b/db/migrate/20150610065936_add_dashboard_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDashboardToUsers < ActiveRecord::Migration
+class AddDashboardToUsers < ActiveRecord::Migration[4.2]
   def up
     add_column :users, :dashboard, :integer, default: 0
   end
diff --git a/db/migrate/20150620233230_add_default_otp_required_for_login_value.rb b/db/migrate/20150620233230_add_default_otp_required_for_login_value.rb
index 8eed8678b2f..4a085ff06f3 100644
--- a/db/migrate/20150620233230_add_default_otp_required_for_login_value.rb
+++ b/db/migrate/20150620233230_add_default_otp_required_for_login_value.rb
@@ -1,4 +1,4 @@
-class AddDefaultOtpRequiredForLoginValue < ActiveRecord::Migration
+class AddDefaultOtpRequiredForLoginValue < ActiveRecord::Migration[4.2]
   def up
     execute %q{UPDATE users SET otp_required_for_login = FALSE WHERE otp_required_for_login IS NULL}
 
diff --git a/db/migrate/20150713160110_add_project_view_to_users.rb b/db/migrate/20150713160110_add_project_view_to_users.rb
index 0de5a93035c..fea63576187 100644
--- a/db/migrate/20150713160110_add_project_view_to_users.rb
+++ b/db/migrate/20150713160110_add_project_view_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddProjectViewToUsers < ActiveRecord::Migration
+class AddProjectViewToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :project_view, :integer, default: 0
   end
diff --git a/db/migrate/20150717130904_add_commits_count_to_project.rb b/db/migrate/20150717130904_add_commits_count_to_project.rb
index 5799e068c69..df6c88f2961 100644
--- a/db/migrate/20150717130904_add_commits_count_to_project.rb
+++ b/db/migrate/20150717130904_add_commits_count_to_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCommitsCountToProject < ActiveRecord::Migration
+class AddCommitsCountToProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :commit_count, :integer, default: 0
   end
diff --git a/db/migrate/20150730122406_add_updated_by_to_issuables_and_notes.rb b/db/migrate/20150730122406_add_updated_by_to_issuables_and_notes.rb
index 78d45c7f96b..fab126c3d04 100644
--- a/db/migrate/20150730122406_add_updated_by_to_issuables_and_notes.rb
+++ b/db/migrate/20150730122406_add_updated_by_to_issuables_and_notes.rb
@@ -1,4 +1,4 @@
-class AddUpdatedByToIssuablesAndNotes < ActiveRecord::Migration
+class AddUpdatedByToIssuablesAndNotes < ActiveRecord::Migration[4.2]
   def change
     add_column :notes, :updated_by_id, :integer
     add_column :issues, :updated_by_id, :integer
diff --git a/db/migrate/20150806104937_create_abuse_reports.rb b/db/migrate/20150806104937_create_abuse_reports.rb
index 52aed9e1d1d..be4fe8d1cfd 100644
--- a/db/migrate/20150806104937_create_abuse_reports.rb
+++ b/db/migrate/20150806104937_create_abuse_reports.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateAbuseReports < ActiveRecord::Migration
+class CreateAbuseReports < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20150812080800_add_settings_import_sources.rb b/db/migrate/20150812080800_add_settings_import_sources.rb
index 07f417fa3e3..59db31c868a 100644
--- a/db/migrate/20150812080800_add_settings_import_sources.rb
+++ b/db/migrate/20150812080800_add_settings_import_sources.rb
@@ -1,7 +1,7 @@
 # rubocop:disable all
 require 'yaml'
 
-class AddSettingsImportSources < ActiveRecord::Migration
+class AddSettingsImportSources < ActiveRecord::Migration[4.2]
   def change
     unless column_exists?(:application_settings, :import_sources)
       add_column :application_settings, :import_sources, :text
diff --git a/db/migrate/20150814065925_remove_oauth_tokens_from_users.rb b/db/migrate/20150814065925_remove_oauth_tokens_from_users.rb
index 7eaa7eda311..f0080ee0b46 100644
--- a/db/migrate/20150814065925_remove_oauth_tokens_from_users.rb
+++ b/db/migrate/20150814065925_remove_oauth_tokens_from_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveOauthTokensFromUsers < ActiveRecord::Migration
+class RemoveOauthTokensFromUsers < ActiveRecord::Migration[4.2]
   def change
     remove_column :users, :github_access_token, :string
     remove_column :users, :gitlab_access_token, :string
diff --git a/db/migrate/20150817163600_deduplicate_user_identities.rb b/db/migrate/20150817163600_deduplicate_user_identities.rb
index b0cfad7d20f..973a87e07ea 100644
--- a/db/migrate/20150817163600_deduplicate_user_identities.rb
+++ b/db/migrate/20150817163600_deduplicate_user_identities.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class DeduplicateUserIdentities < ActiveRecord::Migration
+class DeduplicateUserIdentities < ActiveRecord::Migration[4.2]
   def change
     execute 'DROP TABLE IF EXISTS tt_migration_DeduplicateUserIdentities;'
     execute 'CREATE TABLE tt_migration_DeduplicateUserIdentities AS SELECT id,provider,user_id FROM identities;'
diff --git a/db/migrate/20150818213832_add_sent_notifications.rb b/db/migrate/20150818213832_add_sent_notifications.rb
index 43e8d6a1a82..45e95a843e1 100644
--- a/db/migrate/20150818213832_add_sent_notifications.rb
+++ b/db/migrate/20150818213832_add_sent_notifications.rb
@@ -1,4 +1,4 @@
-class AddSentNotifications < ActiveRecord::Migration
+class AddSentNotifications < ActiveRecord::Migration[4.2]
   def change
     create_table :sent_notifications do |t|
       t.references :project
diff --git a/db/migrate/20150824002011_add_enable_ssl_verification.rb b/db/migrate/20150824002011_add_enable_ssl_verification.rb
index 6e992f08834..2d877914f39 100644
--- a/db/migrate/20150824002011_add_enable_ssl_verification.rb
+++ b/db/migrate/20150824002011_add_enable_ssl_verification.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddEnableSslVerification < ActiveRecord::Migration
+class AddEnableSslVerification < ActiveRecord::Migration[4.2]
   def change
     add_column :web_hooks, :enable_ssl_verification, :boolean, default: false
   end
diff --git a/db/migrate/20150826001931_add_ci_tables.rb b/db/migrate/20150826001931_add_ci_tables.rb
index d1f8506d1fe..aa2af44a15b 100644
--- a/db/migrate/20150826001931_add_ci_tables.rb
+++ b/db/migrate/20150826001931_add_ci_tables.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiTables < ActiveRecord::Migration
+class AddCiTables < ActiveRecord::Migration[4.2]
   def change
     create_table "ci_application_settings", force: true do |t|
       t.boolean  "all_broken_builds"
diff --git a/db/migrate/20150827121444_add_fast_forward_option_to_project.rb b/db/migrate/20150827121444_add_fast_forward_option_to_project.rb
index 35df121519e..bf7db2fb12b 100644
--- a/db/migrate/20150827121444_add_fast_forward_option_to_project.rb
+++ b/db/migrate/20150827121444_add_fast_forward_option_to_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddFastForwardOptionToProject < ActiveRecord::Migration
+class AddFastForwardOptionToProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20150902001023_add_template_to_label.rb b/db/migrate/20150902001023_add_template_to_label.rb
index 0f6ae8d6cc3..10769f29baa 100644
--- a/db/migrate/20150902001023_add_template_to_label.rb
+++ b/db/migrate/20150902001023_add_template_to_label.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTemplateToLabel < ActiveRecord::Migration
+class AddTemplateToLabel < ActiveRecord::Migration[4.2]
   def change
     add_column :labels, :template, :boolean, default: false
   end
diff --git a/db/migrate/20150914215247_add_ci_tags.rb b/db/migrate/20150914215247_add_ci_tags.rb
index b647bc9c8a2..9afa4540540 100644
--- a/db/migrate/20150914215247_add_ci_tags.rb
+++ b/db/migrate/20150914215247_add_ci_tags.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiTags < ActiveRecord::Migration
+class AddCiTags < ActiveRecord::Migration[4.2]
   def change
     create_table "ci_taggings", force: true do |t|
       t.integer  "tag_id"
diff --git a/db/migrate/20150915001905_enable_ssl_verification_by_default.rb b/db/migrate/20150915001905_enable_ssl_verification_by_default.rb
index 6e924262a13..ddd07179753 100644
--- a/db/migrate/20150915001905_enable_ssl_verification_by_default.rb
+++ b/db/migrate/20150915001905_enable_ssl_verification_by_default.rb
@@ -1,4 +1,4 @@
-class EnableSslVerificationByDefault < ActiveRecord::Migration
+class EnableSslVerificationByDefault < ActiveRecord::Migration[4.2]
   def change
     change_column :web_hooks, :enable_ssl_verification, :boolean, default: true
   end
diff --git a/db/migrate/20150916000405_enable_ssl_verification_for_web_hooks.rb b/db/migrate/20150916000405_enable_ssl_verification_for_web_hooks.rb
index 90ce6c2db3d..49081c9d749 100644
--- a/db/migrate/20150916000405_enable_ssl_verification_for_web_hooks.rb
+++ b/db/migrate/20150916000405_enable_ssl_verification_for_web_hooks.rb
@@ -1,4 +1,4 @@
-class EnableSslVerificationForWebHooks < ActiveRecord::Migration
+class EnableSslVerificationForWebHooks < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE web_hooks SET enable_ssl_verification = true")
   end
diff --git a/db/migrate/20150916114643_add_help_page_text_to_application_settings.rb b/db/migrate/20150916114643_add_help_page_text_to_application_settings.rb
index 37a27f11935..52867632880 100644
--- a/db/migrate/20150916114643_add_help_page_text_to_application_settings.rb
+++ b/db/migrate/20150916114643_add_help_page_text_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddHelpPageTextToApplicationSettings < ActiveRecord::Migration
+class AddHelpPageTextToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :help_page_text, :text
   end
diff --git a/db/migrate/20150916145038_add_index_for_committed_at_and_id.rb b/db/migrate/20150916145038_add_index_for_committed_at_and_id.rb
index a18ed93cf37..bf78aacd9f4 100644
--- a/db/migrate/20150916145038_add_index_for_committed_at_and_id.rb
+++ b/db/migrate/20150916145038_add_index_for_committed_at_and_id.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexForCommittedAtAndId < ActiveRecord::Migration
+class AddIndexForCommittedAtAndId < ActiveRecord::Migration[4.2]
   def change
     add_index :ci_commits, [:project_id, :committed_at, :id]
   end
diff --git a/db/migrate/20150918084513_add_ci_enabled_to_application_settings.rb b/db/migrate/20150918084513_add_ci_enabled_to_application_settings.rb
index 6cf668a170e..153c1a798c3 100644
--- a/db/migrate/20150918084513_add_ci_enabled_to_application_settings.rb
+++ b/db/migrate/20150918084513_add_ci_enabled_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddCiEnabledToApplicationSettings < ActiveRecord::Migration
+class AddCiEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :ci_enabled, :boolean, null: false, default: true
   end
diff --git a/db/migrate/20150918161719_remove_invalid_milestones_from_merge_requests.rb b/db/migrate/20150918161719_remove_invalid_milestones_from_merge_requests.rb
index 0aad6fe5e6e..52651e16324 100644
--- a/db/migrate/20150918161719_remove_invalid_milestones_from_merge_requests.rb
+++ b/db/migrate/20150918161719_remove_invalid_milestones_from_merge_requests.rb
@@ -1,4 +1,4 @@
-class RemoveInvalidMilestonesFromMergeRequests < ActiveRecord::Migration
+class RemoveInvalidMilestonesFromMergeRequests < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE merge_requests SET milestone_id = NULL where milestone_id NOT IN (SELECT id FROM milestones)")
   end
diff --git a/db/migrate/20150920010715_add_consumed_timestep_to_users.rb b/db/migrate/20150920010715_add_consumed_timestep_to_users.rb
index c8438b3f6aa..c69944b1e94 100644
--- a/db/migrate/20150920010715_add_consumed_timestep_to_users.rb
+++ b/db/migrate/20150920010715_add_consumed_timestep_to_users.rb
@@ -1,4 +1,4 @@
-class AddConsumedTimestepToUsers < ActiveRecord::Migration
+class AddConsumedTimestepToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :consumed_timestep, :integer
   end
diff --git a/db/migrate/20150920161119_add_line_code_to_sent_notification.rb b/db/migrate/20150920161119_add_line_code_to_sent_notification.rb
index d9af4e71751..671476f0b07 100644
--- a/db/migrate/20150920161119_add_line_code_to_sent_notification.rb
+++ b/db/migrate/20150920161119_add_line_code_to_sent_notification.rb
@@ -1,4 +1,4 @@
-class AddLineCodeToSentNotification < ActiveRecord::Migration
+class AddLineCodeToSentNotification < ActiveRecord::Migration[4.2]
   def change
     add_column :sent_notifications, :line_code, :string
   end
diff --git a/db/migrate/20150924125150_add_project_id_to_ci_commit.rb b/db/migrate/20150924125150_add_project_id_to_ci_commit.rb
index 1a761fe0f86..c9f16b0f3f9 100644
--- a/db/migrate/20150924125150_add_project_id_to_ci_commit.rb
+++ b/db/migrate/20150924125150_add_project_id_to_ci_commit.rb
@@ -1,4 +1,4 @@
-class AddProjectIdToCiCommit < ActiveRecord::Migration
+class AddProjectIdToCiCommit < ActiveRecord::Migration[4.2]
   def up
     add_column :ci_commits, :gl_project_id, :integer
   end
diff --git a/db/migrate/20150924125436_migrate_project_id_for_ci_commits.rb b/db/migrate/20150924125436_migrate_project_id_for_ci_commits.rb
index 2be57b6062e..ff31e70874f 100644
--- a/db/migrate/20150924125436_migrate_project_id_for_ci_commits.rb
+++ b/db/migrate/20150924125436_migrate_project_id_for_ci_commits.rb
@@ -1,4 +1,4 @@
-class MigrateProjectIdForCiCommits < ActiveRecord::Migration
+class MigrateProjectIdForCiCommits < ActiveRecord::Migration[4.2]
   def up
     subquery = 'SELECT gitlab_id FROM ci_projects WHERE ci_projects.id = ci_commits.project_id'
     execute("UPDATE ci_commits SET gl_project_id=(#{subquery}) WHERE gl_project_id IS NULL")
diff --git a/db/migrate/20150930001110_merge_request_error_field.rb b/db/migrate/20150930001110_merge_request_error_field.rb
index c2ee498ef3f..30f012b0a92 100644
--- a/db/migrate/20150930001110_merge_request_error_field.rb
+++ b/db/migrate/20150930001110_merge_request_error_field.rb
@@ -1,4 +1,4 @@
-class MergeRequestErrorField < ActiveRecord::Migration
+class MergeRequestErrorField < ActiveRecord::Migration[4.2]
   def up
     add_column :merge_requests, :merge_error, :string
   end
diff --git a/db/migrate/20150930095736_add_null_to_name_for_ci_projects.rb b/db/migrate/20150930095736_add_null_to_name_for_ci_projects.rb
index 8d47dac6441..181f9f059ac 100644
--- a/db/migrate/20150930095736_add_null_to_name_for_ci_projects.rb
+++ b/db/migrate/20150930095736_add_null_to_name_for_ci_projects.rb
@@ -1,4 +1,4 @@
-class AddNullToNameForCiProjects < ActiveRecord::Migration
+class AddNullToNameForCiProjects < ActiveRecord::Migration[4.2]
   def up
     change_column_null :ci_projects, :name, true
   end
diff --git a/db/migrate/20150930110012_add_group_share_lock.rb b/db/migrate/20150930110012_add_group_share_lock.rb
index 96938bf9ab6..62755765457 100644
--- a/db/migrate/20150930110012_add_group_share_lock.rb
+++ b/db/migrate/20150930110012_add_group_share_lock.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddGroupShareLock < ActiveRecord::Migration
+class AddGroupShareLock < ActiveRecord::Migration[4.2]
   def change
     add_column :namespaces, :share_with_group_lock, :boolean, default: false
   end
diff --git a/db/migrate/20151002112914_add_stage_idx_to_builds.rb b/db/migrate/20151002112914_add_stage_idx_to_builds.rb
index 68a745ffef4..f73df9dc284 100644
--- a/db/migrate/20151002112914_add_stage_idx_to_builds.rb
+++ b/db/migrate/20151002112914_add_stage_idx_to_builds.rb
@@ -1,4 +1,4 @@
-class AddStageIdxToBuilds < ActiveRecord::Migration
+class AddStageIdxToBuilds < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :stage_idx, :integer
   end
diff --git a/db/migrate/20151002121400_add_index_for_builds.rb b/db/migrate/20151002121400_add_index_for_builds.rb
index bd945c54540..5e6f80a1d3d 100644
--- a/db/migrate/20151002121400_add_index_for_builds.rb
+++ b/db/migrate/20151002121400_add_index_for_builds.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexForBuilds < ActiveRecord::Migration
+class AddIndexForBuilds < ActiveRecord::Migration[4.2]
   def up
     add_index :ci_builds, [:commit_id, :stage_idx, :created_at]
   end
diff --git a/db/migrate/20151002122929_add_ref_and_tag_to_builds.rb b/db/migrate/20151002122929_add_ref_and_tag_to_builds.rb
index e3d2ac1cea5..ea41921b6ee 100644
--- a/db/migrate/20151002122929_add_ref_and_tag_to_builds.rb
+++ b/db/migrate/20151002122929_add_ref_and_tag_to_builds.rb
@@ -1,4 +1,4 @@
-class AddRefAndTagToBuilds < ActiveRecord::Migration
+class AddRefAndTagToBuilds < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :tag, :boolean
     add_column :ci_builds, :ref, :string
diff --git a/db/migrate/20151002122943_migrate_ref_and_tag_to_build.rb b/db/migrate/20151002122943_migrate_ref_and_tag_to_build.rb
index 52217ce5af2..b4038e6fa83 100644
--- a/db/migrate/20151002122943_migrate_ref_and_tag_to_build.rb
+++ b/db/migrate/20151002122943_migrate_ref_and_tag_to_build.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateRefAndTagToBuild < ActiveRecord::Migration
+class MigrateRefAndTagToBuild < ActiveRecord::Migration[4.2]
   def change
     execute('UPDATE ci_builds SET ref=(SELECT ref FROM ci_commits WHERE ci_commits.id = ci_builds.commit_id) WHERE ref IS NULL')
     execute('UPDATE ci_builds SET tag=(SELECT tag FROM ci_commits WHERE ci_commits.id = ci_builds.commit_id) WHERE tag IS NULL')
diff --git a/db/migrate/20151005075649_add_user_id_to_build.rb b/db/migrate/20151005075649_add_user_id_to_build.rb
index 0f4b92b8b79..45372bf7cba 100644
--- a/db/migrate/20151005075649_add_user_id_to_build.rb
+++ b/db/migrate/20151005075649_add_user_id_to_build.rb
@@ -1,4 +1,4 @@
-class AddUserIdToBuild < ActiveRecord::Migration
+class AddUserIdToBuild < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :user_id, :integer
   end
diff --git a/db/migrate/20151005150751_add_layout_option_for_users.rb b/db/migrate/20151005150751_add_layout_option_for_users.rb
index 7e68606969f..66cba21320a 100644
--- a/db/migrate/20151005150751_add_layout_option_for_users.rb
+++ b/db/migrate/20151005150751_add_layout_option_for_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddLayoutOptionForUsers < ActiveRecord::Migration
+class AddLayoutOptionForUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :layout, :integer, default: 0
   end
diff --git a/db/migrate/20151005162154_remove_ci_enabled_from_application_settings.rb b/db/migrate/20151005162154_remove_ci_enabled_from_application_settings.rb
index 07dba598749..a8e6e54062a 100644
--- a/db/migrate/20151005162154_remove_ci_enabled_from_application_settings.rb
+++ b/db/migrate/20151005162154_remove_ci_enabled_from_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveCiEnabledFromApplicationSettings < ActiveRecord::Migration
+class RemoveCiEnabledFromApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     remove_column :application_settings, :ci_enabled, :boolean, null: false, default: true
   end
diff --git a/db/migrate/20151007120511_namespaces_projects_path_lower_indexes.rb b/db/migrate/20151007120511_namespaces_projects_path_lower_indexes.rb
index 38208e59804..d6c21bf8639 100644
--- a/db/migrate/20151007120511_namespaces_projects_path_lower_indexes.rb
+++ b/db/migrate/20151007120511_namespaces_projects_path_lower_indexes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class NamespacesProjectsPathLowerIndexes < ActiveRecord::Migration
+class NamespacesProjectsPathLowerIndexes < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def up
diff --git a/db/migrate/20151008110232_add_users_lower_username_email_indexes.rb b/db/migrate/20151008110232_add_users_lower_username_email_indexes.rb
index 6080d2a0fcf..2ba1a6146e2 100644
--- a/db/migrate/20151008110232_add_users_lower_username_email_indexes.rb
+++ b/db/migrate/20151008110232_add_users_lower_username_email_indexes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddUsersLowerUsernameEmailIndexes < ActiveRecord::Migration
+class AddUsersLowerUsernameEmailIndexes < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def up
diff --git a/db/migrate/20151008123042_add_type_and_description_to_builds.rb b/db/migrate/20151008123042_add_type_and_description_to_builds.rb
index a19eb6c6c49..309655cf195 100644
--- a/db/migrate/20151008123042_add_type_and_description_to_builds.rb
+++ b/db/migrate/20151008123042_add_type_and_description_to_builds.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTypeAndDescriptionToBuilds < ActiveRecord::Migration
+class AddTypeAndDescriptionToBuilds < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :type, :string
     add_column :ci_builds, :target_url, :string
diff --git a/db/migrate/20151008130321_migrate_name_to_description_for_builds.rb b/db/migrate/20151008130321_migrate_name_to_description_for_builds.rb
index 306fa7092ea..f4445277a6f 100644
--- a/db/migrate/20151008130321_migrate_name_to_description_for_builds.rb
+++ b/db/migrate/20151008130321_migrate_name_to_description_for_builds.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MigrateNameToDescriptionForBuilds < ActiveRecord::Migration
+class MigrateNameToDescriptionForBuilds < ActiveRecord::Migration[4.2]
   def change
     execute("UPDATE ci_builds SET type='Ci::Build' WHERE type IS NULL")
   end
diff --git a/db/migrate/20151008143519_add_admin_notification_email_setting.rb b/db/migrate/20151008143519_add_admin_notification_email_setting.rb
index 0bb581efe2c..60e0986e5a8 100644
--- a/db/migrate/20151008143519_add_admin_notification_email_setting.rb
+++ b/db/migrate/20151008143519_add_admin_notification_email_setting.rb
@@ -1,4 +1,4 @@
-class AddAdminNotificationEmailSetting < ActiveRecord::Migration
+class AddAdminNotificationEmailSetting < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :admin_notification_email, :string
   end
diff --git a/db/migrate/20151012173029_set_jira_service_api_url.rb b/db/migrate/20151012173029_set_jira_service_api_url.rb
index 2b6f61428c0..91cc6bbc783 100644
--- a/db/migrate/20151012173029_set_jira_service_api_url.rb
+++ b/db/migrate/20151012173029_set_jira_service_api_url.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class SetJiraServiceApiUrl < ActiveRecord::Migration
+class SetJiraServiceApiUrl < ActiveRecord::Migration[4.2]
   # This migration can be performed online without errors, but some Jira API calls may be missed
   # when doing so because api_url is not yet available.
 
diff --git a/db/migrate/20151013092124_add_artifacts_file_to_builds.rb b/db/migrate/20151013092124_add_artifacts_file_to_builds.rb
index 5a299f7b26d..3936386a2c0 100644
--- a/db/migrate/20151013092124_add_artifacts_file_to_builds.rb
+++ b/db/migrate/20151013092124_add_artifacts_file_to_builds.rb
@@ -1,4 +1,4 @@
-class AddArtifactsFileToBuilds < ActiveRecord::Migration
+class AddArtifactsFileToBuilds < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :artifacts_file, :text
   end
diff --git a/db/migrate/20151016131433_add_ci_projects_gl_project_id_index.rb b/db/migrate/20151016131433_add_ci_projects_gl_project_id_index.rb
index eb3351eb767..a9290fef11a 100644
--- a/db/migrate/20151016131433_add_ci_projects_gl_project_id_index.rb
+++ b/db/migrate/20151016131433_add_ci_projects_gl_project_id_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiProjectsGlProjectIdIndex < ActiveRecord::Migration
+class AddCiProjectsGlProjectIdIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :ci_commits, :gl_project_id
   end
diff --git a/db/migrate/20151016195451_add_ci_builds_and_projects_indexes.rb b/db/migrate/20151016195451_add_ci_builds_and_projects_indexes.rb
index 899e004d610..c8a79f25ae5 100644
--- a/db/migrate/20151016195451_add_ci_builds_and_projects_indexes.rb
+++ b/db/migrate/20151016195451_add_ci_builds_and_projects_indexes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiBuildsAndProjectsIndexes < ActiveRecord::Migration
+class AddCiBuildsAndProjectsIndexes < ActiveRecord::Migration[4.2]
   def change
     add_index :ci_projects, :gitlab_id
     add_index :ci_projects, :shared_runners_enabled
diff --git a/db/migrate/20151016195706_add_notes_line_code_index.rb b/db/migrate/20151016195706_add_notes_line_code_index.rb
index 3298630c1e8..0a3ad103009 100644
--- a/db/migrate/20151016195706_add_notes_line_code_index.rb
+++ b/db/migrate/20151016195706_add_notes_line_code_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddNotesLineCodeIndex < ActiveRecord::Migration
+class AddNotesLineCodeIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :notes, :line_code
   end
diff --git a/db/migrate/20151019111551_fix_build_tags.rb b/db/migrate/20151019111551_fix_build_tags.rb
index 299a24b0a7c..3c64388314d 100644
--- a/db/migrate/20151019111551_fix_build_tags.rb
+++ b/db/migrate/20151019111551_fix_build_tags.rb
@@ -1,4 +1,4 @@
-class FixBuildTags < ActiveRecord::Migration
+class FixBuildTags < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE taggings SET taggable_type='CommitStatus' WHERE taggable_type='Ci::Build'")
   end
diff --git a/db/migrate/20151019111703_fail_build_without_names.rb b/db/migrate/20151019111703_fail_build_without_names.rb
index dcdb5d1b25d..2dc9ffa32b9 100644
--- a/db/migrate/20151019111703_fail_build_without_names.rb
+++ b/db/migrate/20151019111703_fail_build_without_names.rb
@@ -1,4 +1,4 @@
-class FailBuildWithoutNames < ActiveRecord::Migration
+class FailBuildWithoutNames < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE ci_builds SET status='failed' WHERE name IS NULL AND status='pending'")
   end
diff --git a/db/migrate/20151020145526_add_services_template_index.rb b/db/migrate/20151020145526_add_services_template_index.rb
index 14ff07bd726..24c373855e2 100644
--- a/db/migrate/20151020145526_add_services_template_index.rb
+++ b/db/migrate/20151020145526_add_services_template_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddServicesTemplateIndex < ActiveRecord::Migration
+class AddServicesTemplateIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :services, :template
   end
diff --git a/db/migrate/20151020173516_ci_limits_to_mysql.rb b/db/migrate/20151020173516_ci_limits_to_mysql.rb
index 9bb960082f5..573922b851b 100644
--- a/db/migrate/20151020173516_ci_limits_to_mysql.rb
+++ b/db/migrate/20151020173516_ci_limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class CiLimitsToMysql < ActiveRecord::Migration
+class CiLimitsToMysql < ActiveRecord::Migration[4.2]
   def change
     return unless ActiveRecord::Base.configurations[Rails.env]['adapter'] =~ /^mysql/
 
diff --git a/db/migrate/20151020173906_add_ci_builds_index_for_status.rb b/db/migrate/20151020173906_add_ci_builds_index_for_status.rb
index 81a31e46ff8..231fc4f2a17 100644
--- a/db/migrate/20151020173906_add_ci_builds_index_for_status.rb
+++ b/db/migrate/20151020173906_add_ci_builds_index_for_status.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiBuildsIndexForStatus < ActiveRecord::Migration
+class AddCiBuildsIndexForStatus < ActiveRecord::Migration[4.2]
   def change
     add_index :ci_builds, [:commit_id, :status, :type]
   end
diff --git a/db/migrate/20151023112551_fail_build_with_empty_name.rb b/db/migrate/20151023112551_fail_build_with_empty_name.rb
index 41c0f0649cd..28f531463bc 100644
--- a/db/migrate/20151023112551_fail_build_with_empty_name.rb
+++ b/db/migrate/20151023112551_fail_build_with_empty_name.rb
@@ -1,4 +1,4 @@
-class FailBuildWithEmptyName < ActiveRecord::Migration
+class FailBuildWithEmptyName < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE ci_builds SET status='failed' WHERE (name IS NULL OR name='') AND status='pending'")
   end
diff --git a/db/migrate/20151023144219_remove_satellites.rb b/db/migrate/20151023144219_remove_satellites.rb
index e73f300028a..2d1310b0208 100644
--- a/db/migrate/20151023144219_remove_satellites.rb
+++ b/db/migrate/20151023144219_remove_satellites.rb
@@ -1,6 +1,6 @@
 require 'fileutils'
 
-class RemoveSatellites < ActiveRecord::Migration
+class RemoveSatellites < ActiveRecord::Migration[4.2]
   def up
     satellites = Gitlab.config['satellites']
     return if satellites.nil?
diff --git a/db/migrate/20151026182941_add_project_path_index.rb b/db/migrate/20151026182941_add_project_path_index.rb
index 117f65c1a1b..bf0444450cd 100644
--- a/db/migrate/20151026182941_add_project_path_index.rb
+++ b/db/migrate/20151026182941_add_project_path_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddProjectPathIndex < ActiveRecord::Migration
+class AddProjectPathIndex < ActiveRecord::Migration[4.2]
   def up
     add_index :projects, :path
   end
diff --git a/db/migrate/20151028152939_add_merge_when_build_succeeds_to_merge_request.rb b/db/migrate/20151028152939_add_merge_when_build_succeeds_to_merge_request.rb
index 4a989669464..5b11a430e30 100644
--- a/db/migrate/20151028152939_add_merge_when_build_succeeds_to_merge_request.rb
+++ b/db/migrate/20151028152939_add_merge_when_build_succeeds_to_merge_request.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddMergeWhenBuildSucceedsToMergeRequest < ActiveRecord::Migration
+class AddMergeWhenBuildSucceedsToMergeRequest < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :merge_params, :text
     add_column :merge_requests, :merge_when_build_succeeds, :boolean, default: false, null: false
diff --git a/db/migrate/20151103001141_add_public_to_group.rb b/db/migrate/20151103001141_add_public_to_group.rb
index ba1f7c27832..a5590bc1adc 100644
--- a/db/migrate/20151103001141_add_public_to_group.rb
+++ b/db/migrate/20151103001141_add_public_to_group.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPublicToGroup < ActiveRecord::Migration
+class AddPublicToGroup < ActiveRecord::Migration[4.2]
   def change
     add_column :namespaces, :public, :boolean, default: false
   end
diff --git a/db/migrate/20151103133339_add_shared_runners_setting.rb b/db/migrate/20151103133339_add_shared_runners_setting.rb
index 4231dfd5c2e..6fc845d1396 100644
--- a/db/migrate/20151103133339_add_shared_runners_setting.rb
+++ b/db/migrate/20151103133339_add_shared_runners_setting.rb
@@ -1,4 +1,4 @@
-class AddSharedRunnersSetting < ActiveRecord::Migration
+class AddSharedRunnersSetting < ActiveRecord::Migration[4.2]
   def up
     add_column :application_settings, :shared_runners_enabled, :boolean, default: true, null: false
   end
diff --git a/db/migrate/20151103134857_create_lfs_objects.rb b/db/migrate/20151103134857_create_lfs_objects.rb
index db6fa27199b..2ba77e431a1 100644
--- a/db/migrate/20151103134857_create_lfs_objects.rb
+++ b/db/migrate/20151103134857_create_lfs_objects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateLfsObjects < ActiveRecord::Migration
+class CreateLfsObjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20151103134958_create_lfs_objects_projects.rb b/db/migrate/20151103134958_create_lfs_objects_projects.rb
index 5af1c39fd9c..6f8488463b0 100644
--- a/db/migrate/20151103134958_create_lfs_objects_projects.rb
+++ b/db/migrate/20151103134958_create_lfs_objects_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateLfsObjectsProjects < ActiveRecord::Migration
+class CreateLfsObjectsProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20151104105513_add_file_to_lfs_objects.rb b/db/migrate/20151104105513_add_file_to_lfs_objects.rb
index 7c57f3f0df6..050b1e07503 100644
--- a/db/migrate/20151104105513_add_file_to_lfs_objects.rb
+++ b/db/migrate/20151104105513_add_file_to_lfs_objects.rb
@@ -1,4 +1,4 @@
-class AddFileToLfsObjects < ActiveRecord::Migration
+class AddFileToLfsObjects < ActiveRecord::Migration[4.2]
   def change
     add_column :lfs_objects, :file, :string
   end
diff --git a/db/migrate/20151105094515_create_releases.rb b/db/migrate/20151105094515_create_releases.rb
index 34dd7a10942..4b180a59486 100644
--- a/db/migrate/20151105094515_create_releases.rb
+++ b/db/migrate/20151105094515_create_releases.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateReleases < ActiveRecord::Migration
+class CreateReleases < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20151106000015_add_is_award_to_notes.rb b/db/migrate/20151106000015_add_is_award_to_notes.rb
index b463d939b78..1d866fb3213 100644
--- a/db/migrate/20151106000015_add_is_award_to_notes.rb
+++ b/db/migrate/20151106000015_add_is_award_to_notes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIsAwardToNotes < ActiveRecord::Migration
+class AddIsAwardToNotes < ActiveRecord::Migration[4.2]
   def change
     add_column :notes, :is_award, :boolean, default: false, null: false
     add_index :notes, :is_award
diff --git a/db/migrate/20151109100728_add_max_artifacts_size_to_application_settings.rb b/db/migrate/20151109100728_add_max_artifacts_size_to_application_settings.rb
index 01d8c0f043e..9c14cfd4656 100644
--- a/db/migrate/20151109100728_add_max_artifacts_size_to_application_settings.rb
+++ b/db/migrate/20151109100728_add_max_artifacts_size_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddMaxArtifactsSizeToApplicationSettings < ActiveRecord::Migration
+class AddMaxArtifactsSizeToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :max_artifacts_size, :integer, default: 100, null: false
   end
diff --git a/db/migrate/20151109134526_add_issues_state_index.rb b/db/migrate/20151109134526_add_issues_state_index.rb
index 7a9970e8591..c77ca90a0d6 100644
--- a/db/migrate/20151109134526_add_issues_state_index.rb
+++ b/db/migrate/20151109134526_add_issues_state_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIssuesStateIndex < ActiveRecord::Migration
+class AddIssuesStateIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :issues, :state
   end
diff --git a/db/migrate/20151109134916_add_projects_visibility_level_index.rb b/db/migrate/20151109134916_add_projects_visibility_level_index.rb
index 471db437b11..1e945f0e56f 100644
--- a/db/migrate/20151109134916_add_projects_visibility_level_index.rb
+++ b/db/migrate/20151109134916_add_projects_visibility_level_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddProjectsVisibilityLevelIndex < ActiveRecord::Migration
+class AddProjectsVisibilityLevelIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :projects, :visibility_level
   end
diff --git a/db/migrate/20151110125604_add_import_error_to_project.rb b/db/migrate/20151110125604_add_import_error_to_project.rb
index 7fc990f8d0a..48a15ad0737 100644
--- a/db/migrate/20151110125604_add_import_error_to_project.rb
+++ b/db/migrate/20151110125604_add_import_error_to_project.rb
@@ -1,4 +1,4 @@
-class AddImportErrorToProject < ActiveRecord::Migration
+class AddImportErrorToProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :import_error, :text
   end
diff --git a/db/migrate/20151114113410_add_index_for_lfs_oid_and_size.rb b/db/migrate/20151114113410_add_index_for_lfs_oid_and_size.rb
index 00a4c74ffbc..f2788117cc2 100644
--- a/db/migrate/20151114113410_add_index_for_lfs_oid_and_size.rb
+++ b/db/migrate/20151114113410_add_index_for_lfs_oid_and_size.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexForLfsOidAndSize < ActiveRecord::Migration
+class AddIndexForLfsOidAndSize < ActiveRecord::Migration[4.2]
   def change
     add_index :lfs_objects, :oid
     add_index :lfs_objects, [:oid, :size]
diff --git a/db/migrate/20151116144118_add_unique_for_lfs_oid_index.rb b/db/migrate/20151116144118_add_unique_for_lfs_oid_index.rb
index 1f192544ea1..3bfbae67119 100644
--- a/db/migrate/20151116144118_add_unique_for_lfs_oid_index.rb
+++ b/db/migrate/20151116144118_add_unique_for_lfs_oid_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddUniqueForLfsOidIndex < ActiveRecord::Migration
+class AddUniqueForLfsOidIndex < ActiveRecord::Migration[4.2]
   def change
     remove_index :lfs_objects, :oid
     remove_index :lfs_objects, [:oid, :size]
diff --git a/db/migrate/20151118162244_add_projects_public_index.rb b/db/migrate/20151118162244_add_projects_public_index.rb
index 589f124c21e..3a525c69ad0 100644
--- a/db/migrate/20151118162244_add_projects_public_index.rb
+++ b/db/migrate/20151118162244_add_projects_public_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddProjectsPublicIndex < ActiveRecord::Migration
+class AddProjectsPublicIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :namespaces, :public
   end
diff --git a/db/migrate/20151201203948_raise_hook_url_limit.rb b/db/migrate/20151201203948_raise_hook_url_limit.rb
index 98a7fca6f6f..c1a4974b8c9 100644
--- a/db/migrate/20151201203948_raise_hook_url_limit.rb
+++ b/db/migrate/20151201203948_raise_hook_url_limit.rb
@@ -1,4 +1,4 @@
-class RaiseHookUrlLimit < ActiveRecord::Migration
+class RaiseHookUrlLimit < ActiveRecord::Migration[4.2]
   def change
     change_column :web_hooks, :url, :string, limit: 2000
   end
diff --git a/db/migrate/20151203162133_add_hide_project_limit_to_users.rb b/db/migrate/20151203162133_add_hide_project_limit_to_users.rb
index 5dc6d8bf445..1b96a0dc550 100644
--- a/db/migrate/20151203162133_add_hide_project_limit_to_users.rb
+++ b/db/migrate/20151203162133_add_hide_project_limit_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddHideProjectLimitToUsers < ActiveRecord::Migration
+class AddHideProjectLimitToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :hide_project_limit, :boolean, default: false
   end
diff --git a/db/migrate/20151203162134_add_build_events_to_services.rb b/db/migrate/20151203162134_add_build_events_to_services.rb
index 455882e5ec0..c49604f8b61 100644
--- a/db/migrate/20151203162134_add_build_events_to_services.rb
+++ b/db/migrate/20151203162134_add_build_events_to_services.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddBuildEventsToServices < ActiveRecord::Migration
+class AddBuildEventsToServices < ActiveRecord::Migration[4.2]
   def change
     add_column :services, :build_events, :boolean, default: false, null: false
     add_column :web_hooks, :build_events, :boolean, default: false, null: false
diff --git a/db/migrate/20151209144329_migrate_ci_web_hooks.rb b/db/migrate/20151209144329_migrate_ci_web_hooks.rb
index e1e4729f821..7562735cb1e 100644
--- a/db/migrate/20151209144329_migrate_ci_web_hooks.rb
+++ b/db/migrate/20151209144329_migrate_ci_web_hooks.rb
@@ -1,4 +1,4 @@
-class MigrateCiWebHooks < ActiveRecord::Migration
+class MigrateCiWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20151209145909_migrate_ci_emails.rb b/db/migrate/20151209145909_migrate_ci_emails.rb
index e1d92f0157e..a1f51c55a55 100644
--- a/db/migrate/20151209145909_migrate_ci_emails.rb
+++ b/db/migrate/20151209145909_migrate_ci_emails.rb
@@ -1,4 +1,4 @@
-class MigrateCiEmails < ActiveRecord::Migration
+class MigrateCiEmails < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20151210030143_add_unlock_token_to_user.rb b/db/migrate/20151210030143_add_unlock_token_to_user.rb
index 0ea66ba65df..28b736adfb5 100644
--- a/db/migrate/20151210030143_add_unlock_token_to_user.rb
+++ b/db/migrate/20151210030143_add_unlock_token_to_user.rb
@@ -1,4 +1,4 @@
-class AddUnlockTokenToUser < ActiveRecord::Migration
+class AddUnlockTokenToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :unlock_token, :string
   end
diff --git a/db/migrate/20151210072243_add_runners_registration_token_to_application_settings.rb b/db/migrate/20151210072243_add_runners_registration_token_to_application_settings.rb
index 00f88180e46..5da33149b59 100644
--- a/db/migrate/20151210072243_add_runners_registration_token_to_application_settings.rb
+++ b/db/migrate/20151210072243_add_runners_registration_token_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddRunnersRegistrationTokenToApplicationSettings < ActiveRecord::Migration
+class AddRunnersRegistrationTokenToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :runners_registration_token, :string
   end
diff --git a/db/migrate/20151210125232_migrate_ci_slack_service.rb b/db/migrate/20151210125232_migrate_ci_slack_service.rb
index e6dca4c0008..72c90f92377 100644
--- a/db/migrate/20151210125232_migrate_ci_slack_service.rb
+++ b/db/migrate/20151210125232_migrate_ci_slack_service.rb
@@ -1,4 +1,4 @@
-class MigrateCiSlackService < ActiveRecord::Migration
+class MigrateCiSlackService < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20151210125927_migrate_ci_hip_chat_service.rb b/db/migrate/20151210125927_migrate_ci_hip_chat_service.rb
index 72fcebf2959..5ec0798c38f 100644
--- a/db/migrate/20151210125927_migrate_ci_hip_chat_service.rb
+++ b/db/migrate/20151210125927_migrate_ci_hip_chat_service.rb
@@ -1,4 +1,4 @@
-class MigrateCiHipChatService < ActiveRecord::Migration
+class MigrateCiHipChatService < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20151210125928_add_ci_to_project.rb b/db/migrate/20151210125928_add_ci_to_project.rb
index a9ff49a3f7e..182f1e17b9a 100644
--- a/db/migrate/20151210125928_add_ci_to_project.rb
+++ b/db/migrate/20151210125928_add_ci_to_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiToProject < ActiveRecord::Migration
+class AddCiToProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :ci_id, :integer
     add_column :projects, :builds_enabled, :boolean, default: true, null: false
diff --git a/db/migrate/20151210125929_add_project_id_to_ci.rb b/db/migrate/20151210125929_add_project_id_to_ci.rb
index 84273591fa2..f5f2c353f4a 100644
--- a/db/migrate/20151210125929_add_project_id_to_ci.rb
+++ b/db/migrate/20151210125929_add_project_id_to_ci.rb
@@ -1,4 +1,4 @@
-class AddProjectIdToCi < ActiveRecord::Migration
+class AddProjectIdToCi < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :gl_project_id, :integer
     add_column :ci_runner_projects, :gl_project_id, :integer
diff --git a/db/migrate/20151210125930_migrate_ci_to_project.rb b/db/migrate/20151210125930_migrate_ci_to_project.rb
index c32c7feb193..f7573ad1a8d 100644
--- a/db/migrate/20151210125930_migrate_ci_to_project.rb
+++ b/db/migrate/20151210125930_migrate_ci_to_project.rb
@@ -1,4 +1,4 @@
-class MigrateCiToProject < ActiveRecord::Migration
+class MigrateCiToProject < ActiveRecord::Migration[4.2]
   def up
     migrate_project_id_for_table('ci_runner_projects')
     migrate_project_id_for_table('ci_triggers')
diff --git a/db/migrate/20151210125931_add_index_to_ci_tables.rb b/db/migrate/20151210125931_add_index_to_ci_tables.rb
index d87d335cf6b..2cbc5b50538 100644
--- a/db/migrate/20151210125931_add_index_to_ci_tables.rb
+++ b/db/migrate/20151210125931_add_index_to_ci_tables.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexToCiTables < ActiveRecord::Migration
+class AddIndexToCiTables < ActiveRecord::Migration[4.2]
   def change
     add_index :ci_builds, :gl_project_id
     add_index :ci_runner_projects, :gl_project_id
diff --git a/db/migrate/20151210125932_drop_null_for_ci_tables.rb b/db/migrate/20151210125932_drop_null_for_ci_tables.rb
index e1a0a964589..b48fef4b749 100644
--- a/db/migrate/20151210125932_drop_null_for_ci_tables.rb
+++ b/db/migrate/20151210125932_drop_null_for_ci_tables.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class DropNullForCiTables < ActiveRecord::Migration
+class DropNullForCiTables < ActiveRecord::Migration[4.2]
   def change
     remove_index :ci_variables, :project_id
     remove_index :ci_runner_projects, :project_id
diff --git a/db/migrate/20151215132013_add_pages_size_to_application_settings.rb b/db/migrate/20151215132013_add_pages_size_to_application_settings.rb
index f3a663f805b..7190d476dc7 100644
--- a/db/migrate/20151215132013_add_pages_size_to_application_settings.rb
+++ b/db/migrate/20151215132013_add_pages_size_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddPagesSizeToApplicationSettings < ActiveRecord::Migration
+class AddPagesSizeToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20151218154042_add_tfa_to_application_settings.rb b/db/migrate/20151218154042_add_tfa_to_application_settings.rb
index dd95db775c5..a981fe2720f 100644
--- a/db/migrate/20151218154042_add_tfa_to_application_settings.rb
+++ b/db/migrate/20151218154042_add_tfa_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddTfaToApplicationSettings < ActiveRecord::Migration
+class AddTfaToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     change_table :application_settings do |t|
       t.boolean :require_two_factor_authentication, default: false
diff --git a/db/migrate/20151221234414_add_tfa_additional_fields.rb b/db/migrate/20151221234414_add_tfa_additional_fields.rb
index c16df47932f..fed734f77f4 100644
--- a/db/migrate/20151221234414_add_tfa_additional_fields.rb
+++ b/db/migrate/20151221234414_add_tfa_additional_fields.rb
@@ -1,4 +1,4 @@
-class AddTfaAdditionalFields < ActiveRecord::Migration
+class AddTfaAdditionalFields < ActiveRecord::Migration[4.2]
   def change
     change_table :users do |t|
       t.datetime :otp_grace_period_started_at, null: true
diff --git a/db/migrate/20151224123230_rename_emojis.rb b/db/migrate/20151224123230_rename_emojis.rb
index 62d921dfdcc..f1e4b1fe181 100644
--- a/db/migrate/20151224123230_rename_emojis.rb
+++ b/db/migrate/20151224123230_rename_emojis.rb
@@ -1,5 +1,5 @@
 # Migration type: online without errors (works on previous version and new one)
-class RenameEmojis < ActiveRecord::Migration
+class RenameEmojis < ActiveRecord::Migration[4.2]
   def up
     # Renames aliases to main names
     execute("UPDATE notes SET note ='thumbsup' WHERE is_award = true AND note = '+1'")
diff --git a/db/migrate/20151228111122_remove_public_from_namespace.rb b/db/migrate/20151228111122_remove_public_from_namespace.rb
index bcb322d9cba..ad922e3fc58 100644
--- a/db/migrate/20151228111122_remove_public_from_namespace.rb
+++ b/db/migrate/20151228111122_remove_public_from_namespace.rb
@@ -1,6 +1,6 @@
 # rubocop:disable all
 # Migration type: online
-class RemovePublicFromNamespace < ActiveRecord::Migration
+class RemovePublicFromNamespace < ActiveRecord::Migration[4.2]
   def change
     remove_column :namespaces, :public, :boolean
   end
diff --git a/db/migrate/20151228150906_influxdb_settings.rb b/db/migrate/20151228150906_influxdb_settings.rb
index 2e080a02e6a..8266e3c5044 100644
--- a/db/migrate/20151228150906_influxdb_settings.rb
+++ b/db/migrate/20151228150906_influxdb_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class InfluxdbSettings < ActiveRecord::Migration
+class InfluxdbSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :metrics_enabled, :boolean, default: false
 
diff --git a/db/migrate/20151228175719_add_recaptcha_to_application_settings.rb b/db/migrate/20151228175719_add_recaptcha_to_application_settings.rb
index 259fd0248d2..523f2cae092 100644
--- a/db/migrate/20151228175719_add_recaptcha_to_application_settings.rb
+++ b/db/migrate/20151228175719_add_recaptcha_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddRecaptchaToApplicationSettings < ActiveRecord::Migration
+class AddRecaptchaToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     change_table :application_settings do |t|
       t.boolean :recaptcha_enabled, default: false
diff --git a/db/migrate/20151229102248_influxdb_udp_port_setting.rb b/db/migrate/20151229102248_influxdb_udp_port_setting.rb
index ae0499f936d..da37e3bc148 100644
--- a/db/migrate/20151229102248_influxdb_udp_port_setting.rb
+++ b/db/migrate/20151229102248_influxdb_udp_port_setting.rb
@@ -1,4 +1,4 @@
-class InfluxdbUdpPortSetting < ActiveRecord::Migration
+class InfluxdbUdpPortSetting < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :metrics_port, :integer, default: 8089
   end
diff --git a/db/migrate/20151229112614_influxdb_remote_database_setting.rb b/db/migrate/20151229112614_influxdb_remote_database_setting.rb
index d2ac906ead3..5fdf4c6d4cb 100644
--- a/db/migrate/20151229112614_influxdb_remote_database_setting.rb
+++ b/db/migrate/20151229112614_influxdb_remote_database_setting.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class InfluxdbRemoteDatabaseSetting < ActiveRecord::Migration
+class InfluxdbRemoteDatabaseSetting < ActiveRecord::Migration[4.2]
   def change
     remove_column :application_settings, :metrics_database
   end
diff --git a/db/migrate/20151230132518_add_artifacts_metadata_to_ci_build.rb b/db/migrate/20151230132518_add_artifacts_metadata_to_ci_build.rb
index 6c282fc5039..61a3d6486f3 100644
--- a/db/migrate/20151230132518_add_artifacts_metadata_to_ci_build.rb
+++ b/db/migrate/20151230132518_add_artifacts_metadata_to_ci_build.rb
@@ -1,4 +1,4 @@
-class AddArtifactsMetadataToCiBuild < ActiveRecord::Migration
+class AddArtifactsMetadataToCiBuild < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :artifacts_metadata, :text
   end
diff --git a/db/migrate/20151231152326_add_akismet_to_application_settings.rb b/db/migrate/20151231152326_add_akismet_to_application_settings.rb
index 3f52c758f9a..ef51ea03a5b 100644
--- a/db/migrate/20151231152326_add_akismet_to_application_settings.rb
+++ b/db/migrate/20151231152326_add_akismet_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddAkismetToApplicationSettings < ActiveRecord::Migration
+class AddAkismetToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     change_table :application_settings do |t|
       t.boolean :akismet_enabled, default: false
diff --git a/db/migrate/20151231202530_remove_alert_type_from_broadcast_messages.rb b/db/migrate/20151231202530_remove_alert_type_from_broadcast_messages.rb
index 0bdd639eb21..2d8b44840f0 100644
--- a/db/migrate/20151231202530_remove_alert_type_from_broadcast_messages.rb
+++ b/db/migrate/20151231202530_remove_alert_type_from_broadcast_messages.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveAlertTypeFromBroadcastMessages < ActiveRecord::Migration
+class RemoveAlertTypeFromBroadcastMessages < ActiveRecord::Migration[4.2]
   def change
     remove_column :broadcast_messages, :alert_type, :integer
   end
diff --git a/db/migrate/20160106162223_add_index_milestones_title.rb b/db/migrate/20160106162223_add_index_milestones_title.rb
index 9b9b6445a08..d42bddefe64 100644
--- a/db/migrate/20160106162223_add_index_milestones_title.rb
+++ b/db/migrate/20160106162223_add_index_milestones_title.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexMilestonesTitle < ActiveRecord::Migration
+class AddIndexMilestonesTitle < ActiveRecord::Migration[4.2]
   def change
     add_index :milestones, :title
   end
diff --git a/db/migrate/20160106164438_remove_influxdb_credentials.rb b/db/migrate/20160106164438_remove_influxdb_credentials.rb
index 987d75d6fda..569d5a0cf36 100644
--- a/db/migrate/20160106164438_remove_influxdb_credentials.rb
+++ b/db/migrate/20160106164438_remove_influxdb_credentials.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveInfluxdbCredentials < ActiveRecord::Migration
+class RemoveInfluxdbCredentials < ActiveRecord::Migration[4.2]
   def change
     remove_column :application_settings, :metrics_username, :string
     remove_column :application_settings, :metrics_password, :string
diff --git a/db/migrate/20160109054846_create_spam_logs.rb b/db/migrate/20160109054846_create_spam_logs.rb
index f7103276639..dc97d03f7ff 100644
--- a/db/migrate/20160109054846_create_spam_logs.rb
+++ b/db/migrate/20160109054846_create_spam_logs.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateSpamLogs < ActiveRecord::Migration
+class CreateSpamLogs < ActiveRecord::Migration[4.2]
   def change
     create_table :spam_logs do |t|
       t.integer :user_id
diff --git a/db/migrate/20160113111034_add_metrics_sample_interval.rb b/db/migrate/20160113111034_add_metrics_sample_interval.rb
index b741f5d2c75..9c3377571aa 100644
--- a/db/migrate/20160113111034_add_metrics_sample_interval.rb
+++ b/db/migrate/20160113111034_add_metrics_sample_interval.rb
@@ -1,4 +1,4 @@
-class AddMetricsSampleInterval < ActiveRecord::Migration
+class AddMetricsSampleInterval < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :metrics_sample_interval, :integer,
       default: 15
diff --git a/db/migrate/20160118155830_add_sentry_to_application_settings.rb b/db/migrate/20160118155830_add_sentry_to_application_settings.rb
index fa7ff9d9228..20f3925b964 100644
--- a/db/migrate/20160118155830_add_sentry_to_application_settings.rb
+++ b/db/migrate/20160118155830_add_sentry_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddSentryToApplicationSettings < ActiveRecord::Migration
+class AddSentryToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     change_table :application_settings do |t|
       t.boolean :sentry_enabled, default: false
diff --git a/db/migrate/20160118232755_add_ip_blocking_settings_to_application_settings.rb b/db/migrate/20160118232755_add_ip_blocking_settings_to_application_settings.rb
index 19ea40b5547..809a6cceef5 100644
--- a/db/migrate/20160118232755_add_ip_blocking_settings_to_application_settings.rb
+++ b/db/migrate/20160118232755_add_ip_blocking_settings_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIpBlockingSettingsToApplicationSettings < ActiveRecord::Migration
+class AddIpBlockingSettingsToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :ip_blocking_enabled, :boolean, default: false
     add_column :application_settings, :dnsbl_servers_list, :text
diff --git a/db/migrate/20160119111158_add_services_category.rb b/db/migrate/20160119111158_add_services_category.rb
index f77484b2f96..979a48584a9 100644
--- a/db/migrate/20160119111158_add_services_category.rb
+++ b/db/migrate/20160119111158_add_services_category.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddServicesCategory < ActiveRecord::Migration
+class AddServicesCategory < ActiveRecord::Migration[4.2]
   def up
     add_column :services, :category, :string, default: 'common', null: false
 
diff --git a/db/migrate/20160119112418_add_services_default.rb b/db/migrate/20160119112418_add_services_default.rb
index 7fa531899fe..41ba5d98afe 100644
--- a/db/migrate/20160119112418_add_services_default.rb
+++ b/db/migrate/20160119112418_add_services_default.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddServicesDefault < ActiveRecord::Migration
+class AddServicesDefault < ActiveRecord::Migration[4.2]
   def up
     add_column :services, :default, :boolean, default: false
 
diff --git a/db/migrate/20160119145451_add_ldap_email_to_users.rb b/db/migrate/20160119145451_add_ldap_email_to_users.rb
index 5b2b0bd31ca..bf8c27900b8 100644
--- a/db/migrate/20160119145451_add_ldap_email_to_users.rb
+++ b/db/migrate/20160119145451_add_ldap_email_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddLdapEmailToUsers < ActiveRecord::Migration
+class AddLdapEmailToUsers < ActiveRecord::Migration[4.2]
   def up
     add_column :users, :ldap_email, :boolean, default: false, null: false
 
diff --git a/db/migrate/20160120172143_add_base_commit_sha_to_merge_request_diffs.rb b/db/migrate/20160120172143_add_base_commit_sha_to_merge_request_diffs.rb
index d6c6aa4a4e8..9c0a91758f5 100644
--- a/db/migrate/20160120172143_add_base_commit_sha_to_merge_request_diffs.rb
+++ b/db/migrate/20160120172143_add_base_commit_sha_to_merge_request_diffs.rb
@@ -1,4 +1,4 @@
-class AddBaseCommitShaToMergeRequestDiffs < ActiveRecord::Migration
+class AddBaseCommitShaToMergeRequestDiffs < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_request_diffs, :base_commit_sha, :string
   end
diff --git a/db/migrate/20160121030729_add_email_author_in_body_to_application_settings.rb b/db/migrate/20160121030729_add_email_author_in_body_to_application_settings.rb
index 9a2570ae544..0cb1fbe8641 100644
--- a/db/migrate/20160121030729_add_email_author_in_body_to_application_settings.rb
+++ b/db/migrate/20160121030729_add_email_author_in_body_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddEmailAuthorInBodyToApplicationSettings < ActiveRecord::Migration
+class AddEmailAuthorInBodyToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :email_author_in_body, :boolean, default: false
   end
diff --git a/db/migrate/20160122185421_add_pending_delete_to_project.rb b/db/migrate/20160122185421_add_pending_delete_to_project.rb
index 61db852843f..8db0adc9221 100644
--- a/db/migrate/20160122185421_add_pending_delete_to_project.rb
+++ b/db/migrate/20160122185421_add_pending_delete_to_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPendingDeleteToProject < ActiveRecord::Migration
+class AddPendingDeleteToProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :pending_delete, :boolean, default: false
   end
diff --git a/db/migrate/20160128212447_remove_ip_blocking_settings_from_application_settings.rb b/db/migrate/20160128212447_remove_ip_blocking_settings_from_application_settings.rb
index 60ecda998dd..e76f0249ae5 100644
--- a/db/migrate/20160128212447_remove_ip_blocking_settings_from_application_settings.rb
+++ b/db/migrate/20160128212447_remove_ip_blocking_settings_from_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveIpBlockingSettingsFromApplicationSettings < ActiveRecord::Migration
+class RemoveIpBlockingSettingsFromApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     remove_column :application_settings, :ip_blocking_enabled, :boolean, default: false
     remove_column :application_settings, :dnsbl_servers_list, :text
diff --git a/db/migrate/20160128233227_change_lfs_objects_size_column.rb b/db/migrate/20160128233227_change_lfs_objects_size_column.rb
index e7fd1f71777..65aaf2d9a0b 100644
--- a/db/migrate/20160128233227_change_lfs_objects_size_column.rb
+++ b/db/migrate/20160128233227_change_lfs_objects_size_column.rb
@@ -1,4 +1,4 @@
-class ChangeLfsObjectsSizeColumn < ActiveRecord::Migration
+class ChangeLfsObjectsSizeColumn < ActiveRecord::Migration[4.2]
   def change
     change_column :lfs_objects, :size, :integer, limit: 8
   end
diff --git a/db/migrate/20160129135155_remove_dot_atom_path_ending_of_projects.rb b/db/migrate/20160129135155_remove_dot_atom_path_ending_of_projects.rb
index d3ea956952e..6254017615b 100644
--- a/db/migrate/20160129135155_remove_dot_atom_path_ending_of_projects.rb
+++ b/db/migrate/20160129135155_remove_dot_atom_path_ending_of_projects.rb
@@ -1,4 +1,4 @@
-class RemoveDotAtomPathEndingOfProjects < ActiveRecord::Migration
+class RemoveDotAtomPathEndingOfProjects < ActiveRecord::Migration[4.2]
   include Gitlab::ShellAdapter
 
   class ProjectPath
diff --git a/db/migrate/20160129155512_add_merge_commit_sha_to_merge_requests.rb b/db/migrate/20160129155512_add_merge_commit_sha_to_merge_requests.rb
index f0d94226514..8b84705ce7d 100644
--- a/db/migrate/20160129155512_add_merge_commit_sha_to_merge_requests.rb
+++ b/db/migrate/20160129155512_add_merge_commit_sha_to_merge_requests.rb
@@ -1,4 +1,4 @@
-class AddMergeCommitShaToMergeRequests < ActiveRecord::Migration
+class AddMergeCommitShaToMergeRequests < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :merge_commit_sha, :string
   end
diff --git a/db/migrate/20160202091601_add_erasable_to_ci_build.rb b/db/migrate/20160202091601_add_erasable_to_ci_build.rb
index 767ae160d08..214028bd8d3 100644
--- a/db/migrate/20160202091601_add_erasable_to_ci_build.rb
+++ b/db/migrate/20160202091601_add_erasable_to_ci_build.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddErasableToCiBuild < ActiveRecord::Migration
+class AddErasableToCiBuild < ActiveRecord::Migration[4.2]
   def change
     add_reference :ci_builds, :erased_by, references: :users, index: true
     add_column :ci_builds, :erased_at, :datetime
diff --git a/db/migrate/20160202164642_add_allow_guest_to_access_builds_project.rb b/db/migrate/20160202164642_add_allow_guest_to_access_builds_project.rb
index 2c5cb307fad..542f9437911 100644
--- a/db/migrate/20160202164642_add_allow_guest_to_access_builds_project.rb
+++ b/db/migrate/20160202164642_add_allow_guest_to_access_builds_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddAllowGuestToAccessBuildsProject < ActiveRecord::Migration
+class AddAllowGuestToAccessBuildsProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :public_builds, :boolean, default: true, null: false
   end
diff --git a/db/migrate/20160204144558_add_real_size_to_merge_request_diffs.rb b/db/migrate/20160204144558_add_real_size_to_merge_request_diffs.rb
index f996ae74dca..c1f1faf0279 100644
--- a/db/migrate/20160204144558_add_real_size_to_merge_request_diffs.rb
+++ b/db/migrate/20160204144558_add_real_size_to_merge_request_diffs.rb
@@ -1,4 +1,4 @@
-class AddRealSizeToMergeRequestDiffs < ActiveRecord::Migration
+class AddRealSizeToMergeRequestDiffs < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_request_diffs, :real_size, :string
   end
diff --git a/db/migrate/20160209130428_add_index_to_snippet.rb b/db/migrate/20160209130428_add_index_to_snippet.rb
index 4d17c3a2917..480ac193d63 100644
--- a/db/migrate/20160209130428_add_index_to_snippet.rb
+++ b/db/migrate/20160209130428_add_index_to_snippet.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexToSnippet < ActiveRecord::Migration
+class AddIndexToSnippet < ActiveRecord::Migration[4.2]
   def change
     add_index :snippets, :updated_at
   end
diff --git a/db/migrate/20160210105555_create_pages_domain.rb b/db/migrate/20160210105555_create_pages_domain.rb
index 0e8507c7e9a..a46906d64ca 100644
--- a/db/migrate/20160210105555_create_pages_domain.rb
+++ b/db/migrate/20160210105555_create_pages_domain.rb
@@ -1,4 +1,4 @@
-class CreatePagesDomain < ActiveRecord::Migration
+class CreatePagesDomain < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160212123307_create_tasks.rb b/db/migrate/20160212123307_create_tasks.rb
index cd3ad0e4cd8..33acc8af91f 100644
--- a/db/migrate/20160212123307_create_tasks.rb
+++ b/db/migrate/20160212123307_create_tasks.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateTasks < ActiveRecord::Migration
+class CreateTasks < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160217100506_add_description_to_label.rb b/db/migrate/20160217100506_add_description_to_label.rb
index eed6d1f236a..116de8ddfa9 100644
--- a/db/migrate/20160217100506_add_description_to_label.rb
+++ b/db/migrate/20160217100506_add_description_to_label.rb
@@ -1,4 +1,4 @@
-class AddDescriptionToLabel < ActiveRecord::Migration
+class AddDescriptionToLabel < ActiveRecord::Migration[4.2]
   def change
     add_column :labels, :description, :string
   end
diff --git a/db/migrate/20160217174422_add_note_to_tasks.rb b/db/migrate/20160217174422_add_note_to_tasks.rb
index da5cb2e05db..c2a42ce5dd8 100644
--- a/db/migrate/20160217174422_add_note_to_tasks.rb
+++ b/db/migrate/20160217174422_add_note_to_tasks.rb
@@ -1,4 +1,4 @@
-class AddNoteToTasks < ActiveRecord::Migration
+class AddNoteToTasks < ActiveRecord::Migration[4.2]
   def change
     add_reference :tasks, :note, index: true
   end
diff --git a/db/migrate/20160220123949_rename_tasks_to_todos.rb b/db/migrate/20160220123949_rename_tasks_to_todos.rb
index 30c10d27146..0cc110a0a1a 100644
--- a/db/migrate/20160220123949_rename_tasks_to_todos.rb
+++ b/db/migrate/20160220123949_rename_tasks_to_todos.rb
@@ -1,4 +1,4 @@
-class RenameTasksToTodos < ActiveRecord::Migration
+class RenameTasksToTodos < ActiveRecord::Migration[4.2]
   def change
     rename_table :tasks, :todos
   end
diff --git a/db/migrate/20160222153918_create_appearances_ce.rb b/db/migrate/20160222153918_create_appearances_ce.rb
index b2d5949b23f..37bbe62ad3d 100644
--- a/db/migrate/20160222153918_create_appearances_ce.rb
+++ b/db/migrate/20160222153918_create_appearances_ce.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateAppearancesCe < ActiveRecord::Migration
+class CreateAppearancesCe < ActiveRecord::Migration[4.2]
   def change
     unless table_exists?(:appearances)
       create_table :appearances do |t|
diff --git a/db/migrate/20160223192159_add_confidential_to_issues.rb b/db/migrate/20160223192159_add_confidential_to_issues.rb
index 5b99ce30e9f..ca029f12337 100644
--- a/db/migrate/20160223192159_add_confidential_to_issues.rb
+++ b/db/migrate/20160223192159_add_confidential_to_issues.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddConfidentialToIssues < ActiveRecord::Migration
+class AddConfidentialToIssues < ActiveRecord::Migration[4.2]
   def change
     add_column :issues, :confidential, :boolean, default: false
     add_index :issues, :confidential
diff --git a/db/migrate/20160225090018_add_delete_at_to_issues.rb b/db/migrate/20160225090018_add_delete_at_to_issues.rb
index 139f911e1c9..3ae74f491f6 100644
--- a/db/migrate/20160225090018_add_delete_at_to_issues.rb
+++ b/db/migrate/20160225090018_add_delete_at_to_issues.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDeleteAtToIssues < ActiveRecord::Migration
+class AddDeleteAtToIssues < ActiveRecord::Migration[4.2]
   def change
     add_column :issues, :deleted_at, :datetime
     add_index :issues, :deleted_at
diff --git a/db/migrate/20160225101956_add_delete_at_to_merge_requests.rb b/db/migrate/20160225101956_add_delete_at_to_merge_requests.rb
index 4ca3f0dcdc5..ce8657ba88c 100644
--- a/db/migrate/20160225101956_add_delete_at_to_merge_requests.rb
+++ b/db/migrate/20160225101956_add_delete_at_to_merge_requests.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDeleteAtToMergeRequests < ActiveRecord::Migration
+class AddDeleteAtToMergeRequests < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :deleted_at, :datetime
     add_index :merge_requests, :deleted_at
diff --git a/db/migrate/20160226114608_add_trigram_indexes_for_searching.rb b/db/migrate/20160226114608_add_trigram_indexes_for_searching.rb
index 7aa79bf5e02..82b54c552e0 100644
--- a/db/migrate/20160226114608_add_trigram_indexes_for_searching.rb
+++ b/db/migrate/20160226114608_add_trigram_indexes_for_searching.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddTrigramIndexesForSearching < ActiveRecord::Migration
+class AddTrigramIndexesForSearching < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def up
diff --git a/db/migrate/20160227120001_add_event_field_for_web_hook.rb b/db/migrate/20160227120001_add_event_field_for_web_hook.rb
index 89910893ee1..22bbd73114f 100644
--- a/db/migrate/20160227120001_add_event_field_for_web_hook.rb
+++ b/db/migrate/20160227120001_add_event_field_for_web_hook.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddEventFieldForWebHook < ActiveRecord::Migration
+class AddEventFieldForWebHook < ActiveRecord::Migration[4.2]
   def change
     add_column :web_hooks, :wiki_page_events, :boolean, default: false, null: false
   end
diff --git a/db/migrate/20160227120047_add_event_to_services.rb b/db/migrate/20160227120047_add_event_to_services.rb
index fe7c54ca4eb..a3b94734ec2 100644
--- a/db/migrate/20160227120047_add_event_to_services.rb
+++ b/db/migrate/20160227120047_add_event_to_services.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddEventToServices < ActiveRecord::Migration
+class AddEventToServices < ActiveRecord::Migration[4.2]
   def change
     add_column :services, :wiki_page_events, :boolean, default: true
   end
diff --git a/db/migrate/20160229193553_add_main_language_to_repository.rb b/db/migrate/20160229193553_add_main_language_to_repository.rb
index b5446c6a447..15f9a382802 100644
--- a/db/migrate/20160229193553_add_main_language_to_repository.rb
+++ b/db/migrate/20160229193553_add_main_language_to_repository.rb
@@ -1,4 +1,4 @@
-class AddMainLanguageToRepository < ActiveRecord::Migration
+class AddMainLanguageToRepository < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :main_language, :string
   end
diff --git a/db/migrate/20160301124843_add_visibility_level_to_groups.rb b/db/migrate/20160301124843_add_visibility_level_to_groups.rb
index a874e6758dd..ed4bca4f1ba 100644
--- a/db/migrate/20160301124843_add_visibility_level_to_groups.rb
+++ b/db/migrate/20160301124843_add_visibility_level_to_groups.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddVisibilityLevelToGroups < ActiveRecord::Migration
+class AddVisibilityLevelToGroups < ActiveRecord::Migration[4.2]
   def up
     add_column :namespaces, :visibility_level, :integer, null: false, default: Gitlab::VisibilityLevel::PUBLIC
     add_index :namespaces, :visibility_level
diff --git a/db/migrate/20160301174731_add_fingerprint_index.rb b/db/migrate/20160301174731_add_fingerprint_index.rb
index f2c3d1ba1ea..b13373a0468 100644
--- a/db/migrate/20160301174731_add_fingerprint_index.rb
+++ b/db/migrate/20160301174731_add_fingerprint_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddFingerprintIndex < ActiveRecord::Migration
+class AddFingerprintIndex < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   DOWNTIME = false
diff --git a/db/migrate/20160302151724_add_import_credentials_to_project_import_data.rb b/db/migrate/20160302151724_add_import_credentials_to_project_import_data.rb
index ffcd64266e3..b0ea05bd6e1 100644
--- a/db/migrate/20160302151724_add_import_credentials_to_project_import_data.rb
+++ b/db/migrate/20160302151724_add_import_credentials_to_project_import_data.rb
@@ -1,4 +1,4 @@
-class AddImportCredentialsToProjectImportData < ActiveRecord::Migration
+class AddImportCredentialsToProjectImportData < ActiveRecord::Migration[4.2]
   def change
     add_column :project_import_data, :encrypted_credentials, :text
     add_column :project_import_data, :encrypted_credentials_iv, :string
diff --git a/db/migrate/20160302152808_remove_wrong_import_url_from_projects.rb b/db/migrate/20160302152808_remove_wrong_import_url_from_projects.rb
index 95105118764..8a319554c28 100644
--- a/db/migrate/20160302152808_remove_wrong_import_url_from_projects.rb
+++ b/db/migrate/20160302152808_remove_wrong_import_url_from_projects.rb
@@ -2,7 +2,7 @@
 # Loops through old importer projects that kept a token/password in the import URL
 # and encrypts the credentials into a separate field in project#import_data
 # #down method not supported
-class RemoveWrongImportUrlFromProjects < ActiveRecord::Migration
+class RemoveWrongImportUrlFromProjects < ActiveRecord::Migration[4.2]
 
   class ProjectImportDataFake
     extend AttrEncrypted
diff --git a/db/migrate/20160305220806_remove_expires_at_from_snippets.rb b/db/migrate/20160305220806_remove_expires_at_from_snippets.rb
index cac78703bc2..6835f534926 100644
--- a/db/migrate/20160305220806_remove_expires_at_from_snippets.rb
+++ b/db/migrate/20160305220806_remove_expires_at_from_snippets.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveExpiresAtFromSnippets < ActiveRecord::Migration
+class RemoveExpiresAtFromSnippets < ActiveRecord::Migration[4.2]
   def change
     remove_column :snippets, :expires_at, :datetime
   end
diff --git a/db/migrate/20160307221555_disallow_blank_line_code_on_note.rb b/db/migrate/20160307221555_disallow_blank_line_code_on_note.rb
index 49e787d9a9a..26b65ef7037 100644
--- a/db/migrate/20160307221555_disallow_blank_line_code_on_note.rb
+++ b/db/migrate/20160307221555_disallow_blank_line_code_on_note.rb
@@ -1,4 +1,4 @@
-class DisallowBlankLineCodeOnNote < ActiveRecord::Migration
+class DisallowBlankLineCodeOnNote < ActiveRecord::Migration[4.2]
   def up
     execute("UPDATE notes SET line_code = NULL WHERE line_code = ''")
   end
diff --git a/db/migrate/20160308212903_add_default_group_visibility_to_application_settings.rb b/db/migrate/20160308212903_add_default_group_visibility_to_application_settings.rb
index 92c0a1e088e..16053408fe0 100644
--- a/db/migrate/20160308212903_add_default_group_visibility_to_application_settings.rb
+++ b/db/migrate/20160308212903_add_default_group_visibility_to_application_settings.rb
@@ -3,7 +3,7 @@
 # Sets default_visibility_level to value on settings if not restricted
 # If value is restricted takes higher visibility level allowed
 
-class AddDefaultGroupVisibilityToApplicationSettings < ActiveRecord::Migration
+class AddDefaultGroupVisibilityToApplicationSettings < ActiveRecord::Migration[4.2]
   def up
     add_column :application_settings, :default_group_visibility, :integer
     # Unfortunately, this can't be a `default`, since we don't want the configuration specific
diff --git a/db/migrate/20160309140734_fix_todos.rb b/db/migrate/20160309140734_fix_todos.rb
index 94fe1e4fdc3..917055f5036 100644
--- a/db/migrate/20160309140734_fix_todos.rb
+++ b/db/migrate/20160309140734_fix_todos.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class FixTodos < ActiveRecord::Migration
+class FixTodos < ActiveRecord::Migration[4.2]
  def up
     execute <<-SQL
       DELETE FROM todos
diff --git a/db/migrate/20160310124959_add_due_date_to_issues.rb b/db/migrate/20160310124959_add_due_date_to_issues.rb
index a4eb6aaee63..8da38ea60b1 100644
--- a/db/migrate/20160310124959_add_due_date_to_issues.rb
+++ b/db/migrate/20160310124959_add_due_date_to_issues.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddDueDateToIssues < ActiveRecord::Migration
+class AddDueDateToIssues < ActiveRecord::Migration[4.2]
   def change
     add_column :issues, :due_date, :date
     add_index :issues, :due_date
diff --git a/db/migrate/20160310185910_add_external_flag_to_users.rb b/db/migrate/20160310185910_add_external_flag_to_users.rb
index 209496dc786..768bbe4cd42 100644
--- a/db/migrate/20160310185910_add_external_flag_to_users.rb
+++ b/db/migrate/20160310185910_add_external_flag_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddExternalFlagToUsers < ActiveRecord::Migration
+class AddExternalFlagToUsers < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :external, :boolean, default: false
   end
diff --git a/db/migrate/20160314094147_add_priority_to_label.rb b/db/migrate/20160314094147_add_priority_to_label.rb
index 7fb23cba4c9..8e2aaf50109 100644
--- a/db/migrate/20160314094147_add_priority_to_label.rb
+++ b/db/migrate/20160314094147_add_priority_to_label.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddPriorityToLabel < ActiveRecord::Migration
+class AddPriorityToLabel < ActiveRecord::Migration[4.2]
   def change
     add_column :labels, :priority, :integer
     add_index :labels, :priority
diff --git a/db/migrate/20160314114439_add_requested_at_to_members.rb b/db/migrate/20160314114439_add_requested_at_to_members.rb
index 76c8b8a1a24..e7e03f96ef8 100644
--- a/db/migrate/20160314114439_add_requested_at_to_members.rb
+++ b/db/migrate/20160314114439_add_requested_at_to_members.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddRequestedAtToMembers < ActiveRecord::Migration
+class AddRequestedAtToMembers < ActiveRecord::Migration[4.2]
   def change
     add_column :members, :requested_at, :datetime
   end
diff --git a/db/migrate/20160314143402_projects_add_pushes_since_gc.rb b/db/migrate/20160314143402_projects_add_pushes_since_gc.rb
index 9f8ffe073a3..e64093d39cf 100644
--- a/db/migrate/20160314143402_projects_add_pushes_since_gc.rb
+++ b/db/migrate/20160314143402_projects_add_pushes_since_gc.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class ProjectsAddPushesSinceGc < ActiveRecord::Migration
+class ProjectsAddPushesSinceGc < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :pushes_since_gc, :integer, default: 0
   end
diff --git a/db/migrate/20160315135439_project_add_repository_check.rb b/db/migrate/20160315135439_project_add_repository_check.rb
index 8fe649246c7..c03d8bb041c 100644
--- a/db/migrate/20160315135439_project_add_repository_check.rb
+++ b/db/migrate/20160315135439_project_add_repository_check.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class ProjectAddRepositoryCheck < ActiveRecord::Migration
+class ProjectAddRepositoryCheck < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :last_repository_check_failed, :boolean
     add_index :projects, :last_repository_check_failed
diff --git a/db/migrate/20160316123110_ci_runners_token_index.rb b/db/migrate/20160316123110_ci_runners_token_index.rb
index ff3d36d68ee..026846e6464 100644
--- a/db/migrate/20160316123110_ci_runners_token_index.rb
+++ b/db/migrate/20160316123110_ci_runners_token_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CiRunnersTokenIndex < ActiveRecord::Migration
+class CiRunnersTokenIndex < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def change
diff --git a/db/migrate/20160316192622_change_target_id_to_null_on_todos.rb b/db/migrate/20160316192622_change_target_id_to_null_on_todos.rb
index 6871b3920df..488c3d4945c 100644
--- a/db/migrate/20160316192622_change_target_id_to_null_on_todos.rb
+++ b/db/migrate/20160316192622_change_target_id_to_null_on_todos.rb
@@ -1,4 +1,4 @@
-class ChangeTargetIdToNullOnTodos < ActiveRecord::Migration
+class ChangeTargetIdToNullOnTodos < ActiveRecord::Migration[4.2]
   def change
     change_column_null :todos, :target_id, true
   end
diff --git a/db/migrate/20160316204731_add_commit_id_to_todos.rb b/db/migrate/20160316204731_add_commit_id_to_todos.rb
index d79858fc920..d1c004b2ced 100644
--- a/db/migrate/20160316204731_add_commit_id_to_todos.rb
+++ b/db/migrate/20160316204731_add_commit_id_to_todos.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCommitIdToTodos < ActiveRecord::Migration
+class AddCommitIdToTodos < ActiveRecord::Migration[4.2]
   def change
     add_column :todos, :commit_id, :string
     add_index :todos, :commit_id
diff --git a/db/migrate/20160317092222_add_moved_to_to_issue.rb b/db/migrate/20160317092222_add_moved_to_to_issue.rb
index 2bf549d7ecd..8d81d84fd20 100644
--- a/db/migrate/20160317092222_add_moved_to_to_issue.rb
+++ b/db/migrate/20160317092222_add_moved_to_to_issue.rb
@@ -1,4 +1,4 @@
-class AddMovedToToIssue < ActiveRecord::Migration
+class AddMovedToToIssue < ActiveRecord::Migration[4.2]
   def change
     add_reference :issues, :moved_to, references: :issues # rubocop:disable Migration/AddReference
   end
diff --git a/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb b/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
index 07ae7c95477..9692def430c 100644
--- a/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
+++ b/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class IndexNamespacesOnVisibilityLevel < ActiveRecord::Migration
+class IndexNamespacesOnVisibilityLevel < ActiveRecord::Migration[4.2]
   def change
     unless index_exists?(:namespaces, :visibility_level)
       add_index :namespaces, :visibility_level
diff --git a/db/migrate/20160324020319_remove_todos_for_deleted_issues.rb b/db/migrate/20160324020319_remove_todos_for_deleted_issues.rb
index 1fff9759d1e..a25d15a81ef 100644
--- a/db/migrate/20160324020319_remove_todos_for_deleted_issues.rb
+++ b/db/migrate/20160324020319_remove_todos_for_deleted_issues.rb
@@ -1,4 +1,4 @@
-class RemoveTodosForDeletedIssues < ActiveRecord::Migration
+class RemoveTodosForDeletedIssues < ActiveRecord::Migration[4.2]
   def up
     execute <<-SQL
       DELETE FROM todos
diff --git a/db/migrate/20160328112808_create_notification_settings.rb b/db/migrate/20160328112808_create_notification_settings.rb
index 7d77e8004ba..db19d2e370c 100644
--- a/db/migrate/20160328112808_create_notification_settings.rb
+++ b/db/migrate/20160328112808_create_notification_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateNotificationSettings < ActiveRecord::Migration
+class CreateNotificationSettings < ActiveRecord::Migration[4.2]
   def change
     create_table :notification_settings do |t|
       t.references :user, null: false
diff --git a/db/migrate/20160328115649_migrate_new_notification_setting.rb b/db/migrate/20160328115649_migrate_new_notification_setting.rb
index 3c81b2c37bf..5ba09e75145 100644
--- a/db/migrate/20160328115649_migrate_new_notification_setting.rb
+++ b/db/migrate/20160328115649_migrate_new_notification_setting.rb
@@ -5,7 +5,7 @@
 # - during migration some users will receive notifications based on their global settings (project/group settings will be ignored)
 # - its possible to get duplicate records for notification settings since we don't create uniq index yet
 #
-class MigrateNewNotificationSetting < ActiveRecord::Migration
+class MigrateNewNotificationSetting < ActiveRecord::Migration[4.2]
   def up
     timestamp = Time.now.strftime('%F %T')
     execute "INSERT INTO notification_settings ( user_id, source_id, source_type, level, created_at, updated_at ) SELECT user_id, source_id, source_type, notification_level, '#{timestamp}', '#{timestamp}' FROM members WHERE user_id IS NOT NULL"
diff --git a/db/migrate/20160328121138_add_notification_setting_index.rb b/db/migrate/20160328121138_add_notification_setting_index.rb
index 667270d6b04..ed82b172296 100644
--- a/db/migrate/20160328121138_add_notification_setting_index.rb
+++ b/db/migrate/20160328121138_add_notification_setting_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddNotificationSettingIndex < ActiveRecord::Migration
+class AddNotificationSettingIndex < ActiveRecord::Migration[4.2]
   def change
     add_index :notification_settings, :user_id
     add_index :notification_settings, [:source_id, :source_type]
diff --git a/db/migrate/20160329144452_add_index_on_pending_delete_projects.rb b/db/migrate/20160329144452_add_index_on_pending_delete_projects.rb
index a3df8fb4e2e..15c44f74451 100644
--- a/db/migrate/20160329144452_add_index_on_pending_delete_projects.rb
+++ b/db/migrate/20160329144452_add_index_on_pending_delete_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexOnPendingDeleteProjects < ActiveRecord::Migration
+class AddIndexOnPendingDeleteProjects < ActiveRecord::Migration[4.2]
   def change
     add_index :projects, :pending_delete
   end
diff --git a/db/migrate/20160331133914_remove_todos_for_deleted_merge_requests.rb b/db/migrate/20160331133914_remove_todos_for_deleted_merge_requests.rb
index 54cea964ff2..634a696377c 100644
--- a/db/migrate/20160331133914_remove_todos_for_deleted_merge_requests.rb
+++ b/db/migrate/20160331133914_remove_todos_for_deleted_merge_requests.rb
@@ -1,4 +1,4 @@
-class RemoveTodosForDeletedMergeRequests < ActiveRecord::Migration
+class RemoveTodosForDeletedMergeRequests < ActiveRecord::Migration[4.2]
   def up
     execute <<-SQL
       DELETE FROM todos
diff --git a/db/migrate/20160331223143_remove_twitter_sharing_enabled_from_application_settings.rb b/db/migrate/20160331223143_remove_twitter_sharing_enabled_from_application_settings.rb
index dec80497fb3..6e5a748d096 100644
--- a/db/migrate/20160331223143_remove_twitter_sharing_enabled_from_application_settings.rb
+++ b/db/migrate/20160331223143_remove_twitter_sharing_enabled_from_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveTwitterSharingEnabledFromApplicationSettings < ActiveRecord::Migration
+class RemoveTwitterSharingEnabledFromApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     remove_column :application_settings, :twitter_sharing_enabled, :boolean
   end
diff --git a/db/migrate/20160407120251_add_images_enabled_for_project.rb b/db/migrate/20160407120251_add_images_enabled_for_project.rb
index 47f0ca8e8de..2c42d89ccdf 100644
--- a/db/migrate/20160407120251_add_images_enabled_for_project.rb
+++ b/db/migrate/20160407120251_add_images_enabled_for_project.rb
@@ -1,4 +1,4 @@
-class AddImagesEnabledForProject < ActiveRecord::Migration
+class AddImagesEnabledForProject < ActiveRecord::Migration[4.2]
   def change
     add_column :projects, :container_registry_enabled, :boolean
   end
diff --git a/db/migrate/20160412140240_add_repository_checks_enabled_setting.rb b/db/migrate/20160412140240_add_repository_checks_enabled_setting.rb
index 920d4d41110..a59563b835e 100644
--- a/db/migrate/20160412140240_add_repository_checks_enabled_setting.rb
+++ b/db/migrate/20160412140240_add_repository_checks_enabled_setting.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddRepositoryChecksEnabledSetting < ActiveRecord::Migration
+class AddRepositoryChecksEnabledSetting < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :repository_checks_enabled, :boolean, default: true
   end
diff --git a/db/migrate/20160412173416_add_fields_to_ci_commit.rb b/db/migrate/20160412173416_add_fields_to_ci_commit.rb
index 00162af5cda..4b3d4e8bd30 100644
--- a/db/migrate/20160412173416_add_fields_to_ci_commit.rb
+++ b/db/migrate/20160412173416_add_fields_to_ci_commit.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddFieldsToCiCommit < ActiveRecord::Migration
+class AddFieldsToCiCommit < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_commits, :status, :string
     add_column :ci_commits, :started_at, :timestamp
diff --git a/db/migrate/20160412173417_update_ci_commit.rb b/db/migrate/20160412173417_update_ci_commit.rb
index 858faeb060e..91dd4582f7a 100644
--- a/db/migrate/20160412173417_update_ci_commit.rb
+++ b/db/migrate/20160412173417_update_ci_commit.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class UpdateCiCommit < ActiveRecord::Migration
+class UpdateCiCommit < ActiveRecord::Migration[4.2]
   # This migration can be run online, but needs to be executed for the second time after restarting Unicorn workers
   # Otherwise Offline migration should be used.
   def change
diff --git a/db/migrate/20160412173418_add_ci_commit_indexes.rb b/db/migrate/20160412173418_add_ci_commit_indexes.rb
index 414f1f8279f..709e6b84d57 100644
--- a/db/migrate/20160412173418_add_ci_commit_indexes.rb
+++ b/db/migrate/20160412173418_add_ci_commit_indexes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddCiCommitIndexes < ActiveRecord::Migration
+class AddCiCommitIndexes < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def change
diff --git a/db/migrate/20160413115152_add_token_to_web_hooks.rb b/db/migrate/20160413115152_add_token_to_web_hooks.rb
index f04225068cd..43fe46dfe5d 100644
--- a/db/migrate/20160413115152_add_token_to_web_hooks.rb
+++ b/db/migrate/20160413115152_add_token_to_web_hooks.rb
@@ -1,4 +1,4 @@
-class AddTokenToWebHooks < ActiveRecord::Migration
+class AddTokenToWebHooks < ActiveRecord::Migration[4.2]
   def change
     add_column :web_hooks, :token, :string
   end
diff --git a/db/migrate/20160415062917_create_personal_access_tokens.rb b/db/migrate/20160415062917_create_personal_access_tokens.rb
index 94650026994..43599db799e 100644
--- a/db/migrate/20160415062917_create_personal_access_tokens.rb
+++ b/db/migrate/20160415062917_create_personal_access_tokens.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreatePersonalAccessTokens < ActiveRecord::Migration
+class CreatePersonalAccessTokens < ActiveRecord::Migration[4.2]
   def change
     create_table :personal_access_tokens do |t|
       t.references :user, index: true, foreign_key: true, null: false
diff --git a/db/migrate/20160415133440_add_shared_runners_text_to_application_settings.rb b/db/migrate/20160415133440_add_shared_runners_text_to_application_settings.rb
index d493044c67b..e96c0591a07 100644
--- a/db/migrate/20160415133440_add_shared_runners_text_to_application_settings.rb
+++ b/db/migrate/20160415133440_add_shared_runners_text_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddSharedRunnersTextToApplicationSettings < ActiveRecord::Migration
+class AddSharedRunnersTextToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :shared_runners_text, :text
   end
diff --git a/db/migrate/20160416180807_add_award_emoji.rb b/db/migrate/20160416180807_add_award_emoji.rb
index 0d252e5044e..99c984fd116 100644
--- a/db/migrate/20160416180807_add_award_emoji.rb
+++ b/db/migrate/20160416180807_add_award_emoji.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddAwardEmoji < ActiveRecord::Migration
+class AddAwardEmoji < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160416182152_convert_award_note_to_emoji_award.rb b/db/migrate/20160416182152_convert_award_note_to_emoji_award.rb
index 50f159a80b1..af2820986f0 100644
--- a/db/migrate/20160416182152_convert_award_note_to_emoji_award.rb
+++ b/db/migrate/20160416182152_convert_award_note_to_emoji_award.rb
@@ -1,4 +1,4 @@
-class ConvertAwardNoteToEmojiAward < ActiveRecord::Migration
+class ConvertAwardNoteToEmojiAward < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def up
diff --git a/db/migrate/20160419120017_add_metrics_packet_size.rb b/db/migrate/20160419120017_add_metrics_packet_size.rb
index 78c163d62ac..16c3ebfe22b 100644
--- a/db/migrate/20160419120017_add_metrics_packet_size.rb
+++ b/db/migrate/20160419120017_add_metrics_packet_size.rb
@@ -1,4 +1,4 @@
-class AddMetricsPacketSize < ActiveRecord::Migration
+class AddMetricsPacketSize < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :metrics_packet_size, :integer, default: 1
   end
diff --git a/db/migrate/20160419122101_add_only_allow_merge_if_build_succeeds_to_projects.rb b/db/migrate/20160419122101_add_only_allow_merge_if_build_succeeds_to_projects.rb
index 1716b6e8153..cf842a684a6 100644
--- a/db/migrate/20160419122101_add_only_allow_merge_if_build_succeeds_to_projects.rb
+++ b/db/migrate/20160419122101_add_only_allow_merge_if_build_succeeds_to_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddOnlyAllowMergeIfBuildSucceedsToProjects < ActiveRecord::Migration
+class AddOnlyAllowMergeIfBuildSucceedsToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160421130527_disable_repository_checks.rb b/db/migrate/20160421130527_disable_repository_checks.rb
index 7e65ddc45e7..8b3ce73c5e8 100644
--- a/db/migrate/20160421130527_disable_repository_checks.rb
+++ b/db/migrate/20160421130527_disable_repository_checks.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class DisableRepositoryChecks < ActiveRecord::Migration
+class DisableRepositoryChecks < ActiveRecord::Migration[4.2]
   def up
     change_column_default :application_settings, :repository_checks_enabled, false 
     execute 'UPDATE application_settings SET repository_checks_enabled = false'
diff --git a/db/migrate/20160425045124_create_u2f_registrations.rb b/db/migrate/20160425045124_create_u2f_registrations.rb
index 72cbe98ebba..9b48fc822b6 100644
--- a/db/migrate/20160425045124_create_u2f_registrations.rb
+++ b/db/migrate/20160425045124_create_u2f_registrations.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateU2fRegistrations < ActiveRecord::Migration
+class CreateU2fRegistrations < ActiveRecord::Migration[4.2]
   def change
     create_table :u2f_registrations do |t|
       t.text :certificate
diff --git a/db/migrate/20160504091942_add_disabled_oauth_sign_in_sources_to_application_settings.rb b/db/migrate/20160504091942_add_disabled_oauth_sign_in_sources_to_application_settings.rb
index facd33875ba..9a0d1a2d316 100644
--- a/db/migrate/20160504091942_add_disabled_oauth_sign_in_sources_to_application_settings.rb
+++ b/db/migrate/20160504091942_add_disabled_oauth_sign_in_sources_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddDisabledOauthSignInSourcesToApplicationSettings < ActiveRecord::Migration
+class AddDisabledOauthSignInSourcesToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :disabled_oauth_sign_in_sources, :text
   end
diff --git a/db/migrate/20160504112519_add_run_untagged_to_ci_runner.rb b/db/migrate/20160504112519_add_run_untagged_to_ci_runner.rb
index 84e5e4eabe2..03ec29b9951 100644
--- a/db/migrate/20160504112519_add_run_untagged_to_ci_runner.rb
+++ b/db/migrate/20160504112519_add_run_untagged_to_ci_runner.rb
@@ -1,4 +1,4 @@
-class AddRunUntaggedToCiRunner < ActiveRecord::Migration
+class AddRunUntaggedToCiRunner < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160508194200_remove_wall_enabled_from_projects.rb b/db/migrate/20160508194200_remove_wall_enabled_from_projects.rb
index 6792ffc957a..4edbeb09f74 100644
--- a/db/migrate/20160508194200_remove_wall_enabled_from_projects.rb
+++ b/db/migrate/20160508194200_remove_wall_enabled_from_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class RemoveWallEnabledFromProjects < ActiveRecord::Migration
+class RemoveWallEnabledFromProjects < ActiveRecord::Migration[4.2]
   def change
     remove_column :projects, :wall_enabled, :boolean, default: true, null: false
   end
diff --git a/db/migrate/20160508202603_add_head_commit_id_to_merge_request_diffs.rb b/db/migrate/20160508202603_add_head_commit_id_to_merge_request_diffs.rb
index 1c4d60e7234..ee7c9326bfe 100644
--- a/db/migrate/20160508202603_add_head_commit_id_to_merge_request_diffs.rb
+++ b/db/migrate/20160508202603_add_head_commit_id_to_merge_request_diffs.rb
@@ -1,4 +1,4 @@
-class AddHeadCommitIdToMergeRequestDiffs < ActiveRecord::Migration
+class AddHeadCommitIdToMergeRequestDiffs < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_request_diffs, :head_commit_sha, :string
   end
diff --git a/db/migrate/20160508215820_add_type_to_notes.rb b/db/migrate/20160508215820_add_type_to_notes.rb
index 58944d4e651..343743a589c 100644
--- a/db/migrate/20160508215820_add_type_to_notes.rb
+++ b/db/migrate/20160508215820_add_type_to_notes.rb
@@ -1,4 +1,4 @@
-class AddTypeToNotes < ActiveRecord::Migration
+class AddTypeToNotes < ActiveRecord::Migration[4.2]
   def change
     add_column :notes, :type, :string
   end
diff --git a/db/migrate/20160508215920_add_positions_to_diff_notes.rb b/db/migrate/20160508215920_add_positions_to_diff_notes.rb
index 2952c25004e..e0ee03d0fb5 100644
--- a/db/migrate/20160508215920_add_positions_to_diff_notes.rb
+++ b/db/migrate/20160508215920_add_positions_to_diff_notes.rb
@@ -1,4 +1,4 @@
-class AddPositionsToDiffNotes < ActiveRecord::Migration
+class AddPositionsToDiffNotes < ActiveRecord::Migration[4.2]
   def change
     add_column :notes, :position, :text
     add_column :notes, :original_position, :text
diff --git a/db/migrate/20160508221410_set_type_on_legacy_diff_notes.rb b/db/migrate/20160508221410_set_type_on_legacy_diff_notes.rb
index 6dd958ff4a0..567754d4f4e 100644
--- a/db/migrate/20160508221410_set_type_on_legacy_diff_notes.rb
+++ b/db/migrate/20160508221410_set_type_on_legacy_diff_notes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class SetTypeOnLegacyDiffNotes < ActiveRecord::Migration
+class SetTypeOnLegacyDiffNotes < ActiveRecord::Migration[4.2]
   def change
     execute "UPDATE notes SET type = 'LegacyDiffNote' WHERE line_code IS NOT NULL"
   end
diff --git a/db/migrate/20160509091049_add_locked_to_ci_runner.rb b/db/migrate/20160509091049_add_locked_to_ci_runner.rb
index 3fbaef3b7f0..e19db5a4504 100644
--- a/db/migrate/20160509091049_add_locked_to_ci_runner.rb
+++ b/db/migrate/20160509091049_add_locked_to_ci_runner.rb
@@ -1,4 +1,4 @@
-class AddLockedToCiRunner < ActiveRecord::Migration
+class AddLockedToCiRunner < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160509201028_add_health_check_access_token_to_application_settings.rb b/db/migrate/20160509201028_add_health_check_access_token_to_application_settings.rb
index 9d729fec189..54d615f7e21 100644
--- a/db/migrate/20160509201028_add_health_check_access_token_to_application_settings.rb
+++ b/db/migrate/20160509201028_add_health_check_access_token_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddHealthCheckAccessTokenToApplicationSettings < ActiveRecord::Migration
+class AddHealthCheckAccessTokenToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :health_check_access_token, :string
   end
diff --git a/db/migrate/20160516174813_add_send_user_confirmation_email_to_application_settings.rb b/db/migrate/20160516174813_add_send_user_confirmation_email_to_application_settings.rb
index 8c96353b850..9e203b97a43 100644
--- a/db/migrate/20160516174813_add_send_user_confirmation_email_to_application_settings.rb
+++ b/db/migrate/20160516174813_add_send_user_confirmation_email_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddSendUserConfirmationEmailToApplicationSettings < ActiveRecord::Migration
+class AddSendUserConfirmationEmailToApplicationSettings < ActiveRecord::Migration[4.2]
   def up
     add_column :application_settings, :send_user_confirmation_email, :boolean, default: false
 
diff --git a/db/migrate/20160516224534_add_start_commit_id_to_merge_request_diffs.rb b/db/migrate/20160516224534_add_start_commit_id_to_merge_request_diffs.rb
index b7fd76ee84b..a84bfd64bda 100644
--- a/db/migrate/20160516224534_add_start_commit_id_to_merge_request_diffs.rb
+++ b/db/migrate/20160516224534_add_start_commit_id_to_merge_request_diffs.rb
@@ -1,4 +1,4 @@
-class AddStartCommitIdToMergeRequestDiffs < ActiveRecord::Migration
+class AddStartCommitIdToMergeRequestDiffs < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_request_diffs, :start_commit_sha, :string
   end
diff --git a/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb b/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb
index 8e9ab3f8acc..143b84a1662 100644
--- a/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb
+++ b/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddArtifactsExpireDateToCiBuilds < ActiveRecord::Migration
+class AddArtifactsExpireDateToCiBuilds < ActiveRecord::Migration[4.2]
   def change
     add_column :ci_builds, :artifacts_expire_at, :timestamp
   end
diff --git a/db/migrate/20160519203051_add_developers_can_merge_to_protected_branches.rb b/db/migrate/20160519203051_add_developers_can_merge_to_protected_branches.rb
index ac50035eba4..ba0e1654379 100644
--- a/db/migrate/20160519203051_add_developers_can_merge_to_protected_branches.rb
+++ b/db/migrate/20160519203051_add_developers_can_merge_to_protected_branches.rb
@@ -1,4 +1,4 @@
-class AddDevelopersCanMergeToProtectedBranches < ActiveRecord::Migration
+class AddDevelopersCanMergeToProtectedBranches < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160522215720_add_note_type_and_position_to_sent_notification.rb b/db/migrate/20160522215720_add_note_type_and_position_to_sent_notification.rb
index 4eef16c9408..f569fc7c73f 100644
--- a/db/migrate/20160522215720_add_note_type_and_position_to_sent_notification.rb
+++ b/db/migrate/20160522215720_add_note_type_and_position_to_sent_notification.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddNoteTypeAndPositionToSentNotification < ActiveRecord::Migration
+class AddNoteTypeAndPositionToSentNotification < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160525205328_remove_main_language_from_projects.rb b/db/migrate/20160525205328_remove_main_language_from_projects.rb
index dc4ceacddb1..81d0fb5b080 100644
--- a/db/migrate/20160525205328_remove_main_language_from_projects.rb
+++ b/db/migrate/20160525205328_remove_main_language_from_projects.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveMainLanguageFromProjects < ActiveRecord::Migration
+class RemoveMainLanguageFromProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160527020117_remove_notification_settings_for_deleted_projects.rb b/db/migrate/20160527020117_remove_notification_settings_for_deleted_projects.rb
index 7910120b4e0..c530c09859d 100644
--- a/db/migrate/20160527020117_remove_notification_settings_for_deleted_projects.rb
+++ b/db/migrate/20160527020117_remove_notification_settings_for_deleted_projects.rb
@@ -1,4 +1,4 @@
-class RemoveNotificationSettingsForDeletedProjects < ActiveRecord::Migration
+class RemoveNotificationSettingsForDeletedProjects < ActiveRecord::Migration[4.2]
   def up
     execute <<-SQL
       DELETE FROM notification_settings
diff --git a/db/migrate/20160528043124_add_users_state_index.rb b/db/migrate/20160528043124_add_users_state_index.rb
index 6419d2ae71d..3437b35a0c0 100644
--- a/db/migrate/20160528043124_add_users_state_index.rb
+++ b/db/migrate/20160528043124_add_users_state_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddUsersStateIndex < ActiveRecord::Migration
+class AddUsersStateIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20160530150109_add_container_registry_token_expire_delay_to_application_settings.rb b/db/migrate/20160530150109_add_container_registry_token_expire_delay_to_application_settings.rb
index e21376bd571..7b20146e21c 100644
--- a/db/migrate/20160530150109_add_container_registry_token_expire_delay_to_application_settings.rb
+++ b/db/migrate/20160530150109_add_container_registry_token_expire_delay_to_application_settings.rb
@@ -1,6 +1,6 @@
 # This is ONLINE migration
 
-class AddContainerRegistryTokenExpireDelayToApplicationSettings < ActiveRecord::Migration
+class AddContainerRegistryTokenExpireDelayToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160603075128_add_has_external_issue_tracker_to_projects.rb b/db/migrate/20160603075128_add_has_external_issue_tracker_to_projects.rb
index be295f0181d..a7d2d7f9952 100644
--- a/db/migrate/20160603075128_add_has_external_issue_tracker_to_projects.rb
+++ b/db/migrate/20160603075128_add_has_external_issue_tracker_to_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddHasExternalIssueTrackerToProjects < ActiveRecord::Migration
+class AddHasExternalIssueTrackerToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160603180330_remove_duplicated_notification_settings.rb b/db/migrate/20160603180330_remove_duplicated_notification_settings.rb
index fe1c863b5b9..0d8c4bf011c 100644
--- a/db/migrate/20160603180330_remove_duplicated_notification_settings.rb
+++ b/db/migrate/20160603180330_remove_duplicated_notification_settings.rb
@@ -1,4 +1,4 @@
-class RemoveDuplicatedNotificationSettings < ActiveRecord::Migration
+class RemoveDuplicatedNotificationSettings < ActiveRecord::Migration[4.2]
   def up
     duplicates = exec_query(%Q{
       SELECT user_id, source_type, source_id
diff --git a/db/migrate/20160603182247_add_index_to_notification_settings.rb b/db/migrate/20160603182247_add_index_to_notification_settings.rb
index f6ae26d555f..cea178d555c 100644
--- a/db/migrate/20160603182247_add_index_to_notification_settings.rb
+++ b/db/migrate/20160603182247_add_index_to_notification_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class AddIndexToNotificationSettings < ActiveRecord::Migration
+class AddIndexToNotificationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20160608155312_add_after_sign_up_text_to_application_settings.rb b/db/migrate/20160608155312_add_after_sign_up_text_to_application_settings.rb
index 89826fb96cb..3b3f68529a5 100644
--- a/db/migrate/20160608155312_add_after_sign_up_text_to_application_settings.rb
+++ b/db/migrate/20160608155312_add_after_sign_up_text_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddAfterSignUpTextToApplicationSettings < ActiveRecord::Migration
+class AddAfterSignUpTextToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :after_sign_up_text, :text
   end
diff --git a/db/migrate/20160608195742_add_repository_storage_to_projects.rb b/db/migrate/20160608195742_add_repository_storage_to_projects.rb
index e4febd1614d..2b20c9fbd5f 100644
--- a/db/migrate/20160608195742_add_repository_storage_to_projects.rb
+++ b/db/migrate/20160608195742_add_repository_storage_to_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddRepositoryStorageToProjects < ActiveRecord::Migration
+class AddRepositoryStorageToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160608211215_add_user_default_external_to_application_settings.rb b/db/migrate/20160608211215_add_user_default_external_to_application_settings.rb
index 34c702e3fa6..9b5cfc67d5a 100644
--- a/db/migrate/20160608211215_add_user_default_external_to_application_settings.rb
+++ b/db/migrate/20160608211215_add_user_default_external_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddUserDefaultExternalToApplicationSettings < ActiveRecord::Migration
+class AddUserDefaultExternalToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160610140403_remove_notification_setting_not_null_constraints.rb b/db/migrate/20160610140403_remove_notification_setting_not_null_constraints.rb
index 259abb08e47..d5301672dc5 100644
--- a/db/migrate/20160610140403_remove_notification_setting_not_null_constraints.rb
+++ b/db/migrate/20160610140403_remove_notification_setting_not_null_constraints.rb
@@ -1,4 +1,4 @@
-class RemoveNotificationSettingNotNullConstraints < ActiveRecord::Migration
+class RemoveNotificationSettingNotNullConstraints < ActiveRecord::Migration[4.2]
   def up
     change_column :notification_settings, :source_type, :string, null: true
     change_column :notification_settings, :source_id, :integer, null: true
diff --git a/db/migrate/20160610194713_remove_deprecated_issues_tracker_columns_from_projects.rb b/db/migrate/20160610194713_remove_deprecated_issues_tracker_columns_from_projects.rb
index 21b367711c3..1ac65997403 100644
--- a/db/migrate/20160610194713_remove_deprecated_issues_tracker_columns_from_projects.rb
+++ b/db/migrate/20160610194713_remove_deprecated_issues_tracker_columns_from_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/RemoveColumn
-class RemoveDeprecatedIssuesTrackerColumnsFromProjects < ActiveRecord::Migration
+class RemoveDeprecatedIssuesTrackerColumnsFromProjects < ActiveRecord::Migration[4.2]
   def change
     remove_column :projects, :issues_tracker, :string, default: 'gitlab', null: false
     remove_column :projects, :issues_tracker_id, :string
diff --git a/db/migrate/20160610201627_migrate_users_notification_level.rb b/db/migrate/20160610201627_migrate_users_notification_level.rb
index cd8b505de9f..553b7f074f2 100644
--- a/db/migrate/20160610201627_migrate_users_notification_level.rb
+++ b/db/migrate/20160610201627_migrate_users_notification_level.rb
@@ -1,4 +1,4 @@
-class MigrateUsersNotificationLevel < ActiveRecord::Migration
+class MigrateUsersNotificationLevel < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   # Migrates only users who changed their default notification level :participating
diff --git a/db/migrate/20160610204157_add_deployments.rb b/db/migrate/20160610204157_add_deployments.rb
index 0ee0b1f5a86..91b619e7d3d 100644
--- a/db/migrate/20160610204157_add_deployments.rb
+++ b/db/migrate/20160610204157_add_deployments.rb
@@ -1,6 +1,6 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
-class AddDeployments < ActiveRecord::Migration
+class AddDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160610204158_add_environments.rb b/db/migrate/20160610204158_add_environments.rb
index 534a73a5fb6..55fb8b1227b 100644
--- a/db/migrate/20160610204158_add_environments.rb
+++ b/db/migrate/20160610204158_add_environments.rb
@@ -1,6 +1,6 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
-class AddEnvironments < ActiveRecord::Migration
+class AddEnvironments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160610211845_add_environment_to_builds.rb b/db/migrate/20160610211845_add_environment_to_builds.rb
index 990e445ac55..16d5465cafa 100644
--- a/db/migrate/20160610211845_add_environment_to_builds.rb
+++ b/db/migrate/20160610211845_add_environment_to_builds.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddEnvironmentToBuilds < ActiveRecord::Migration
+class AddEnvironmentToBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160610301627_remove_notification_level_from_users.rb b/db/migrate/20160610301627_remove_notification_level_from_users.rb
index 356e53b4b23..93f70c476d2 100644
--- a/db/migrate/20160610301627_remove_notification_level_from_users.rb
+++ b/db/migrate/20160610301627_remove_notification_level_from_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/RemoveColumn
-class RemoveNotificationLevelFromUsers < ActiveRecord::Migration
+class RemoveNotificationLevelFromUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160614182521_add_repository_storage_to_application_settings.rb b/db/migrate/20160614182521_add_repository_storage_to_application_settings.rb
index 6dae91b700b..a1bc0e5cd86 100644
--- a/db/migrate/20160614182521_add_repository_storage_to_application_settings.rb
+++ b/db/migrate/20160614182521_add_repository_storage_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddRepositoryStorageToApplicationSettings < ActiveRecord::Migration
+class AddRepositoryStorageToApplicationSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :application_settings, :repository_storage, :string, default: 'default'
   end
diff --git a/db/migrate/20160615142710_add_index_on_requested_at_to_members.rb b/db/migrate/20160615142710_add_index_on_requested_at_to_members.rb
index 178e4bf5ed3..1b1dab141f8 100644
--- a/db/migrate/20160615142710_add_index_on_requested_at_to_members.rb
+++ b/db/migrate/20160615142710_add_index_on_requested_at_to_members.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexOnRequestedAtToMembers < ActiveRecord::Migration
+class AddIndexOnRequestedAtToMembers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160615173316_add_enabled_git_access_protocols_to_application_settings.rb b/db/migrate/20160615173316_add_enabled_git_access_protocols_to_application_settings.rb
index d0e6d8d1ea1..deb4b86a2fd 100644
--- a/db/migrate/20160615173316_add_enabled_git_access_protocols_to_application_settings.rb
+++ b/db/migrate/20160615173316_add_enabled_git_access_protocols_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddEnabledGitAccessProtocolsToApplicationSettings < ActiveRecord::Migration
+class AddEnabledGitAccessProtocolsToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160615191922_set_missing_stage_on_ci_builds.rb b/db/migrate/20160615191922_set_missing_stage_on_ci_builds.rb
index c58cb957df4..11d15e7c15f 100644
--- a/db/migrate/20160615191922_set_missing_stage_on_ci_builds.rb
+++ b/db/migrate/20160615191922_set_missing_stage_on_ci_builds.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class SetMissingStageOnCiBuilds < ActiveRecord::Migration
+class SetMissingStageOnCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20160616084004_change_project_of_environment.rb b/db/migrate/20160616084004_change_project_of_environment.rb
index cc1daf9b621..23914a0325a 100644
--- a/db/migrate/20160616084004_change_project_of_environment.rb
+++ b/db/migrate/20160616084004_change_project_of_environment.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ChangeProjectOfEnvironment < ActiveRecord::Migration
+class ChangeProjectOfEnvironment < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160616102642_remove_duplicated_keys.rb b/db/migrate/20160616102642_remove_duplicated_keys.rb
index 5e41cc53e32..0b896108292 100644
--- a/db/migrate/20160616102642_remove_duplicated_keys.rb
+++ b/db/migrate/20160616102642_remove_duplicated_keys.rb
@@ -1,4 +1,4 @@
-class RemoveDuplicatedKeys < ActiveRecord::Migration
+class RemoveDuplicatedKeys < ActiveRecord::Migration[4.2]
   def up
     select_all("SELECT fingerprint FROM #{quote_table_name(:keys)} GROUP BY fingerprint HAVING COUNT(*) > 1").each do |row|
       fingerprint = connection.quote(row['fingerprint'])
diff --git a/db/migrate/20160616103005_remove_keys_fingerprint_index_if_exists.rb b/db/migrate/20160616103005_remove_keys_fingerprint_index_if_exists.rb
index 081df23f394..afccc40cc67 100644
--- a/db/migrate/20160616103005_remove_keys_fingerprint_index_if_exists.rb
+++ b/db/migrate/20160616103005_remove_keys_fingerprint_index_if_exists.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class RemoveKeysFingerprintIndexIfExists < ActiveRecord::Migration
+class RemoveKeysFingerprintIndexIfExists < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb b/db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb
index 76bb6a09639..d619acad3d0 100644
--- a/db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb
+++ b/db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddUniqueIndexToKeysFingerprint < ActiveRecord::Migration
+class AddUniqueIndexToKeysFingerprint < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20160617301627_add_events_to_notification_settings.rb b/db/migrate/20160617301627_add_events_to_notification_settings.rb
index 609596f45e4..109817e3d8a 100644
--- a/db/migrate/20160617301627_add_events_to_notification_settings.rb
+++ b/db/migrate/20160617301627_add_events_to_notification_settings.rb
@@ -1,4 +1,4 @@
-class AddEventsToNotificationSettings < ActiveRecord::Migration
+class AddEventsToNotificationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160620115026_add_index_on_runners_locked.rb b/db/migrate/20160620115026_add_index_on_runners_locked.rb
index 48f4495b0a4..c619dc07a91 100644
--- a/db/migrate/20160620115026_add_index_on_runners_locked.rb
+++ b/db/migrate/20160620115026_add_index_on_runners_locked.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexOnRunnersLocked < ActiveRecord::Migration
+class AddIndexOnRunnersLocked < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160621123729_add_rebase_commit_sha_to_merge_requests.rb b/db/migrate/20160621123729_add_rebase_commit_sha_to_merge_requests.rb
index 1222dc640a8..2d3ab4e2583 100644
--- a/db/migrate/20160621123729_add_rebase_commit_sha_to_merge_requests.rb
+++ b/db/migrate/20160621123729_add_rebase_commit_sha_to_merge_requests.rb
@@ -5,7 +5,7 @@
 # into EE.
 #
 # See discussion at https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3932
-class AddRebaseCommitShaToMergeRequests < ActiveRecord::Migration
+class AddRebaseCommitShaToMergeRequests < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb b/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb
index 61dd726fac7..60bd4c36eb6 100644
--- a/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb
+++ b/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddArtifactsSizeToCiBuilds < ActiveRecord::Migration
+class AddArtifactsSizeToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160629025435_add_column_in_progress_merge_commit_sha_to_merge_requests.rb b/db/migrate/20160629025435_add_column_in_progress_merge_commit_sha_to_merge_requests.rb
index 7c5f76572ef..13e1280b71a 100644
--- a/db/migrate/20160629025435_add_column_in_progress_merge_commit_sha_to_merge_requests.rb
+++ b/db/migrate/20160629025435_add_column_in_progress_merge_commit_sha_to_merge_requests.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddColumnInProgressMergeCommitShaToMergeRequests < ActiveRecord::Migration
+class AddColumnInProgressMergeCommitShaToMergeRequests < ActiveRecord::Migration[4.2]
   def change
     add_column :merge_requests, :in_progress_merge_commit_sha, :string
   end
diff --git a/db/migrate/20160703180340_add_index_on_award_emoji_user_and_name.rb b/db/migrate/20160703180340_add_index_on_award_emoji_user_and_name.rb
index 0c25f87dfb4..8a576b99de0 100644
--- a/db/migrate/20160703180340_add_index_on_award_emoji_user_and_name.rb
+++ b/db/migrate/20160703180340_add_index_on_award_emoji_user_and_name.rb
@@ -1,7 +1,7 @@
 # rubocop:disable all
 # Migration type: online without errors
 
-class AddIndexOnAwardEmojiUserAndName < ActiveRecord::Migration
+class AddIndexOnAwardEmojiUserAndName < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160705054938_add_protected_branches_push_access.rb b/db/migrate/20160705054938_add_protected_branches_push_access.rb
index de3aefcb1fb..314d90efa90 100644
--- a/db/migrate/20160705054938_add_protected_branches_push_access.rb
+++ b/db/migrate/20160705054938_add_protected_branches_push_access.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/Timestamps
-class AddProtectedBranchesPushAccess < ActiveRecord::Migration
+class AddProtectedBranchesPushAccess < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160705054952_add_protected_branches_merge_access.rb b/db/migrate/20160705054952_add_protected_branches_merge_access.rb
index 9b18a2061b3..672e0e291db 100644
--- a/db/migrate/20160705054952_add_protected_branches_merge_access.rb
+++ b/db/migrate/20160705054952_add_protected_branches_merge_access.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/Timestamps
-class AddProtectedBranchesMergeAccess < ActiveRecord::Migration
+class AddProtectedBranchesMergeAccess < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160705055254_move_from_developers_can_merge_to_protected_branches_merge_access.rb b/db/migrate/20160705055254_move_from_developers_can_merge_to_protected_branches_merge_access.rb
index 1db0df92bec..1bd462cab06 100644
--- a/db/migrate/20160705055254_move_from_developers_can_merge_to_protected_branches_merge_access.rb
+++ b/db/migrate/20160705055254_move_from_developers_can_merge_to_protected_branches_merge_access.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MoveFromDevelopersCanMergeToProtectedBranchesMergeAccess < ActiveRecord::Migration
+class MoveFromDevelopersCanMergeToProtectedBranchesMergeAccess < ActiveRecord::Migration[4.2]
   DOWNTIME = true
   DOWNTIME_REASON = <<-HEREDOC
     We're creating a `merge_access_level` for each `protected_branch`. If a user creates a `protected_branch` while this
diff --git a/db/migrate/20160705055308_move_from_developers_can_push_to_protected_branches_push_access.rb b/db/migrate/20160705055308_move_from_developers_can_push_to_protected_branches_push_access.rb
index 5c3e189bb5b..d480dac777a 100644
--- a/db/migrate/20160705055308_move_from_developers_can_push_to_protected_branches_push_access.rb
+++ b/db/migrate/20160705055308_move_from_developers_can_push_to_protected_branches_push_access.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MoveFromDevelopersCanPushToProtectedBranchesPushAccess < ActiveRecord::Migration
+class MoveFromDevelopersCanPushToProtectedBranchesPushAccess < ActiveRecord::Migration[4.2]
   DOWNTIME = true
   DOWNTIME_REASON = <<-HEREDOC
     We're creating a `push_access_level` for each `protected_branch`. If a user creates a `protected_branch` while this
diff --git a/db/migrate/20160705055809_remove_developers_can_push_from_protected_branches.rb b/db/migrate/20160705055809_remove_developers_can_push_from_protected_branches.rb
index 058bd539e65..e5c9da072cf 100644
--- a/db/migrate/20160705055809_remove_developers_can_push_from_protected_branches.rb
+++ b/db/migrate/20160705055809_remove_developers_can_push_from_protected_branches.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDevelopersCanPushFromProtectedBranches < ActiveRecord::Migration
+class RemoveDevelopersCanPushFromProtectedBranches < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # This is only required for `#down`
diff --git a/db/migrate/20160705055813_remove_developers_can_merge_from_protected_branches.rb b/db/migrate/20160705055813_remove_developers_can_merge_from_protected_branches.rb
index d0e5da4d28b..2a623b55839 100644
--- a/db/migrate/20160705055813_remove_developers_can_merge_from_protected_branches.rb
+++ b/db/migrate/20160705055813_remove_developers_can_merge_from_protected_branches.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDevelopersCanMergeFromProtectedBranches < ActiveRecord::Migration
+class RemoveDevelopersCanMergeFromProtectedBranches < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # This is only required for `#down`
diff --git a/db/migrate/20160705163108_remove_requesters_that_are_owners.rb b/db/migrate/20160705163108_remove_requesters_that_are_owners.rb
index 1fca230c019..449c67e1b6a 100644
--- a/db/migrate/20160705163108_remove_requesters_that_are_owners.rb
+++ b/db/migrate/20160705163108_remove_requesters_that_are_owners.rb
@@ -1,4 +1,4 @@
-class RemoveRequestersThatAreOwners < ActiveRecord::Migration
+class RemoveRequestersThatAreOwners < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def up
diff --git a/db/migrate/20160707104333_add_lock_to_issuables.rb b/db/migrate/20160707104333_add_lock_to_issuables.rb
index 54866d02cbc..fdc3abf46cc 100644
--- a/db/migrate/20160707104333_add_lock_to_issuables.rb
+++ b/db/migrate/20160707104333_add_lock_to_issuables.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLockToIssuables < ActiveRecord::Migration
+class AddLockToIssuables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160712171823_remove_award_emojis_with_no_user.rb b/db/migrate/20160712171823_remove_award_emojis_with_no_user.rb
index 8ebf1a5234d..0b553182a81 100644
--- a/db/migrate/20160712171823_remove_award_emojis_with_no_user.rb
+++ b/db/migrate/20160712171823_remove_award_emojis_with_no_user.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveAwardEmojisWithNoUser < ActiveRecord::Migration
+class RemoveAwardEmojisWithNoUser < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160713200638_add_repository_read_only_to_projects.rb b/db/migrate/20160713200638_add_repository_read_only_to_projects.rb
index 8ee8b55f210..ba61bc8cbb0 100644
--- a/db/migrate/20160713200638_add_repository_read_only_to_projects.rb
+++ b/db/migrate/20160713200638_add_repository_read_only_to_projects.rb
@@ -1,4 +1,4 @@
-class AddRepositoryReadOnlyToProjects < ActiveRecord::Migration
+class AddRepositoryReadOnlyToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160713205315_add_domain_blacklist_to_application_settings.rb b/db/migrate/20160713205315_add_domain_blacklist_to_application_settings.rb
index f64dfa7675f..4b9ac12253e 100644
--- a/db/migrate/20160713205315_add_domain_blacklist_to_application_settings.rb
+++ b/db/migrate/20160713205315_add_domain_blacklist_to_application_settings.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/SaferBooleanColumn
-class AddDomainBlacklistToApplicationSettings < ActiveRecord::Migration
+class AddDomainBlacklistToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160713222618_add_usage_ping_to_application_settings.rb b/db/migrate/20160713222618_add_usage_ping_to_application_settings.rb
index a7f76cc626e..7ef02316338 100644
--- a/db/migrate/20160713222618_add_usage_ping_to_application_settings.rb
+++ b/db/migrate/20160713222618_add_usage_ping_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddUsagePingToApplicationSettings < ActiveRecord::Migration
+class AddUsagePingToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160715132507_add_user_id_to_pipeline.rb b/db/migrate/20160715132507_add_user_id_to_pipeline.rb
index af0461c4daf..b1e22b1c2bb 100644
--- a/db/migrate/20160715132507_add_user_id_to_pipeline.rb
+++ b/db/migrate/20160715132507_add_user_id_to_pipeline.rb
@@ -1,4 +1,4 @@
-class AddUserIdToPipeline < ActiveRecord::Migration
+class AddUserIdToPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160715134306_add_index_for_pipeline_user_id.rb b/db/migrate/20160715134306_add_index_for_pipeline_user_id.rb
index fec17ffb7f6..8e7ac86a8b7 100644
--- a/db/migrate/20160715134306_add_index_for_pipeline_user_id.rb
+++ b/db/migrate/20160715134306_add_index_for_pipeline_user_id.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexForPipelineUserId < ActiveRecord::Migration
+class AddIndexForPipelineUserId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160715154212_add_request_access_enabled_to_projects.rb b/db/migrate/20160715154212_add_request_access_enabled_to_projects.rb
index 22c925799a3..96260f5fd55 100644
--- a/db/migrate/20160715154212_add_request_access_enabled_to_projects.rb
+++ b/db/migrate/20160715154212_add_request_access_enabled_to_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddRequestAccessEnabledToProjects < ActiveRecord::Migration
+class AddRequestAccessEnabledToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160715204316_add_request_access_enabled_to_groups.rb b/db/migrate/20160715204316_add_request_access_enabled_to_groups.rb
index 4fcb29e1325..14065434523 100644
--- a/db/migrate/20160715204316_add_request_access_enabled_to_groups.rb
+++ b/db/migrate/20160715204316_add_request_access_enabled_to_groups.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddRequestAccessEnabledToGroups < ActiveRecord::Migration
+class AddRequestAccessEnabledToGroups < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160715230841_rename_application_settings_restricted_signup_domains.rb b/db/migrate/20160715230841_rename_application_settings_restricted_signup_domains.rb
index dd15704800a..6a2674fb604 100644
--- a/db/migrate/20160715230841_rename_application_settings_restricted_signup_domains.rb
+++ b/db/migrate/20160715230841_rename_application_settings_restricted_signup_domains.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameApplicationSettingsRestrictedSignupDomains < ActiveRecord::Migration
+class RenameApplicationSettingsRestrictedSignupDomains < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # When using the methods "add_concurrent_index" or "add_column_with_default"
diff --git a/db/migrate/20160716115710_add_when_and_yaml_variables_to_ci_builds.rb b/db/migrate/20160716115710_add_when_and_yaml_variables_to_ci_builds.rb
index 3e084023a65..d403b0a3cc9 100644
--- a/db/migrate/20160716115710_add_when_and_yaml_variables_to_ci_builds.rb
+++ b/db/migrate/20160716115710_add_when_and_yaml_variables_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddWhenAndYamlVariablesToCiBuilds < ActiveRecord::Migration
+class AddWhenAndYamlVariablesToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb b/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb
index fd7a48d881e..2bb9a30e3a3 100644
--- a/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb
+++ b/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddQueuedAtToCiBuilds < ActiveRecord::Migration
+class AddQueuedAtToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160718153603_add_has_external_wiki_to_projects.rb b/db/migrate/20160718153603_add_has_external_wiki_to_projects.rb
index 55a3e954292..e3e4afaf512 100644
--- a/db/migrate/20160718153603_add_has_external_wiki_to_projects.rb
+++ b/db/migrate/20160718153603_add_has_external_wiki_to_projects.rb
@@ -1,4 +1,4 @@
-class AddHasExternalWikiToProjects < ActiveRecord::Migration
+class AddHasExternalWikiToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   def change
diff --git a/db/migrate/20160721081015_drop_and_readd_has_external_wiki_in_projects.rb b/db/migrate/20160721081015_drop_and_readd_has_external_wiki_in_projects.rb
index 58f7f2a2841..d31bbb22392 100644
--- a/db/migrate/20160721081015_drop_and_readd_has_external_wiki_in_projects.rb
+++ b/db/migrate/20160721081015_drop_and_readd_has_external_wiki_in_projects.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class DropAndReaddHasExternalWikiInProjects < ActiveRecord::Migration
+class DropAndReaddHasExternalWikiInProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160722221922_nullify_blank_type_on_notes.rb b/db/migrate/20160722221922_nullify_blank_type_on_notes.rb
index c4b78e8e15c..83ca5c1e6ec 100644
--- a/db/migrate/20160722221922_nullify_blank_type_on_notes.rb
+++ b/db/migrate/20160722221922_nullify_blank_type_on_notes.rb
@@ -1,4 +1,4 @@
-class NullifyBlankTypeOnNotes < ActiveRecord::Migration
+class NullifyBlankTypeOnNotes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160724205507_add_resolved_to_notes.rb b/db/migrate/20160724205507_add_resolved_to_notes.rb
index 3aca272a3f7..fc56d3b1452 100644
--- a/db/migrate/20160724205507_add_resolved_to_notes.rb
+++ b/db/migrate/20160724205507_add_resolved_to_notes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddResolvedToNotes < ActiveRecord::Migration
+class AddResolvedToNotes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160725083350_add_external_url_to_enviroments.rb b/db/migrate/20160725083350_add_external_url_to_enviroments.rb
index 21a8abd310b..e060c6a8499 100644
--- a/db/migrate/20160725083350_add_external_url_to_enviroments.rb
+++ b/db/migrate/20160725083350_add_external_url_to_enviroments.rb
@@ -1,4 +1,4 @@
-class AddExternalUrlToEnviroments < ActiveRecord::Migration
+class AddExternalUrlToEnviroments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160725104020_merge_request_diff_remove_uniq.rb b/db/migrate/20160725104020_merge_request_diff_remove_uniq.rb
index 12e11bc3fbe..d8b4696a246 100644
--- a/db/migrate/20160725104020_merge_request_diff_remove_uniq.rb
+++ b/db/migrate/20160725104020_merge_request_diff_remove_uniq.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class MergeRequestDiffRemoveUniq < ActiveRecord::Migration
+class MergeRequestDiffRemoveUniq < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160725104452_merge_request_diff_add_index.rb b/db/migrate/20160725104452_merge_request_diff_add_index.rb
index 60d81e0bdc0..d3369b3f961 100644
--- a/db/migrate/20160725104452_merge_request_diff_add_index.rb
+++ b/db/migrate/20160725104452_merge_request_diff_add_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class MergeRequestDiffAddIndex < ActiveRecord::Migration
+class MergeRequestDiffAddIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160727163552_create_user_agent_details.rb b/db/migrate/20160727163552_create_user_agent_details.rb
index 3eb36f8464f..6ef54deca90 100644
--- a/db/migrate/20160727163552_create_user_agent_details.rb
+++ b/db/migrate/20160727163552_create_user_agent_details.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateUserAgentDetails < ActiveRecord::Migration
+class CreateUserAgentDetails < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160727191041_create_boards.rb b/db/migrate/20160727191041_create_boards.rb
index 9ec8df1b8e8..60ed5508b10 100644
--- a/db/migrate/20160727191041_create_boards.rb
+++ b/db/migrate/20160727191041_create_boards.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateBoards < ActiveRecord::Migration
+class CreateBoards < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160727193336_create_lists.rb b/db/migrate/20160727193336_create_lists.rb
index 3fd95dc8cfc..4591c9a120f 100644
--- a/db/migrate/20160727193336_create_lists.rb
+++ b/db/migrate/20160727193336_create_lists.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateLists < ActiveRecord::Migration
+class CreateLists < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160728081025_add_pipeline_events_to_web_hooks.rb b/db/migrate/20160728081025_add_pipeline_events_to_web_hooks.rb
index b800e6d7283..fc3e9f03c74 100644
--- a/db/migrate/20160728081025_add_pipeline_events_to_web_hooks.rb
+++ b/db/migrate/20160728081025_add_pipeline_events_to_web_hooks.rb
@@ -1,4 +1,4 @@
-class AddPipelineEventsToWebHooks < ActiveRecord::Migration
+class AddPipelineEventsToWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160728103734_add_pipeline_events_to_services.rb b/db/migrate/20160728103734_add_pipeline_events_to_services.rb
index bcd24fe1566..421859ff5fd 100644
--- a/db/migrate/20160728103734_add_pipeline_events_to_services.rb
+++ b/db/migrate/20160728103734_add_pipeline_events_to_services.rb
@@ -1,4 +1,4 @@
-class AddPipelineEventsToServices < ActiveRecord::Migration
+class AddPipelineEventsToServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160729173930_remove_project_id_from_spam_logs.rb b/db/migrate/20160729173930_remove_project_id_from_spam_logs.rb
index baf254c3bcc..02e417e376f 100644
--- a/db/migrate/20160729173930_remove_project_id_from_spam_logs.rb
+++ b/db/migrate/20160729173930_remove_project_id_from_spam_logs.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveProjectIdFromSpamLogs < ActiveRecord::Migration
+class RemoveProjectIdFromSpamLogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160801163421_add_expires_at_to_member.rb b/db/migrate/20160801163421_add_expires_at_to_member.rb
index 8db0fc60c4b..13ca1d04658 100644
--- a/db/migrate/20160801163421_add_expires_at_to_member.rb
+++ b/db/migrate/20160801163421_add_expires_at_to_member.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddExpiresAtToMember < ActiveRecord::Migration
+class AddExpiresAtToMember < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160801163709_add_submitted_as_ham_to_spam_logs.rb b/db/migrate/20160801163709_add_submitted_as_ham_to_spam_logs.rb
index 20a77000ba8..fde9dee980e 100644
--- a/db/migrate/20160801163709_add_submitted_as_ham_to_spam_logs.rb
+++ b/db/migrate/20160801163709_add_submitted_as_ham_to_spam_logs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddSubmittedAsHamToSpamLogs < ActiveRecord::Migration
+class AddSubmittedAsHamToSpamLogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160802010328_remove_builds_enable_index_on_projects.rb b/db/migrate/20160802010328_remove_builds_enable_index_on_projects.rb
index 6d7733762c8..4ad740e0812 100644
--- a/db/migrate/20160802010328_remove_builds_enable_index_on_projects.rb
+++ b/db/migrate/20160802010328_remove_builds_enable_index_on_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class RemoveBuildsEnableIndexOnProjects < ActiveRecord::Migration
+class RemoveBuildsEnableIndexOnProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160803161903_add_unique_index_to_lists_label_id.rb b/db/migrate/20160803161903_add_unique_index_to_lists_label_id.rb
index 9c1511963f7..f866fe15ec1 100644
--- a/db/migrate/20160803161903_add_unique_index_to_lists_label_id.rb
+++ b/db/migrate/20160803161903_add_unique_index_to_lists_label_id.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddUniqueIndexToListsLabelId < ActiveRecord::Migration
+class AddUniqueIndexToListsLabelId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160804142904_add_ci_config_file_to_project.rb b/db/migrate/20160804142904_add_ci_config_file_to_project.rb
index 341ae555c1b..abd94e63db3 100644
--- a/db/migrate/20160804142904_add_ci_config_file_to_project.rb
+++ b/db/migrate/20160804142904_add_ci_config_file_to_project.rb
@@ -1,4 +1,4 @@
-class AddCiConfigFileToProject < ActiveRecord::Migration
+class AddCiConfigFileToProject < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160804150737_add_timestamps_to_members_again.rb b/db/migrate/20160804150737_add_timestamps_to_members_again.rb
index 6691ba57fbb..4e71197b8e7 100644
--- a/db/migrate/20160804150737_add_timestamps_to_members_again.rb
+++ b/db/migrate/20160804150737_add_timestamps_to_members_again.rb
@@ -6,7 +6,7 @@
 #
 # Why this happened is lost in the mists of time, so repeat the SQL query
 # without speculation, just in case more than one person was affected.
-class AddTimestampsToMembersAgain < ActiveRecord::Migration
+class AddTimestampsToMembersAgain < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20160805041956_add_deleted_at_to_namespaces.rb b/db/migrate/20160805041956_add_deleted_at_to_namespaces.rb
index 404c253e18b..a0dfa3259ec 100644
--- a/db/migrate/20160805041956_add_deleted_at_to_namespaces.rb
+++ b/db/migrate/20160805041956_add_deleted_at_to_namespaces.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/Datetime
 # rubocop:disable RemoveIndex
-class AddDeletedAtToNamespaces < ActiveRecord::Migration
+class AddDeletedAtToNamespaces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160808085531_add_token_to_build.rb b/db/migrate/20160808085531_add_token_to_build.rb
index 3ed2a103ae3..a1d8945a538 100644
--- a/db/migrate/20160808085531_add_token_to_build.rb
+++ b/db/migrate/20160808085531_add_token_to_build.rb
@@ -1,4 +1,4 @@
-class AddTokenToBuild < ActiveRecord::Migration
+class AddTokenToBuild < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160808085602_add_index_for_build_token.rb b/db/migrate/20160808085602_add_index_for_build_token.rb
index 0446b2f2e15..22d50e4165a 100644
--- a/db/migrate/20160808085602_add_index_for_build_token.rb
+++ b/db/migrate/20160808085602_add_index_for_build_token.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexForBuildToken < ActiveRecord::Migration
+class AddIndexForBuildToken < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160810102349_remove_ci_runner_trigram_indexes.rb b/db/migrate/20160810102349_remove_ci_runner_trigram_indexes.rb
index 0cfb637804b..738b93912b6 100644
--- a/db/migrate/20160810102349_remove_ci_runner_trigram_indexes.rb
+++ b/db/migrate/20160810102349_remove_ci_runner_trigram_indexes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveCiRunnerTrigramIndexes < ActiveRecord::Migration
+class RemoveCiRunnerTrigramIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160810142633_remove_redundant_indexes.rb b/db/migrate/20160810142633_remove_redundant_indexes.rb
index ea7d1f9a436..91f82cf9afa 100644
--- a/db/migrate/20160810142633_remove_redundant_indexes.rb
+++ b/db/migrate/20160810142633_remove_redundant_indexes.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class RemoveRedundantIndexes < ActiveRecord::Migration
+class RemoveRedundantIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160811172945_add_can_push_to_keys.rb b/db/migrate/20160811172945_add_can_push_to_keys.rb
index 5fd303fe8fb..2e78ab0249e 100644
--- a/db/migrate/20160811172945_add_can_push_to_keys.rb
+++ b/db/migrate/20160811172945_add_can_push_to_keys.rb
@@ -1,4 +1,4 @@
-class AddCanPushToKeys < ActiveRecord::Migration
+class AddCanPushToKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160816161312_add_column_name_to_u2f_registrations.rb b/db/migrate/20160816161312_add_column_name_to_u2f_registrations.rb
index 7152bd04331..76b60787323 100644
--- a/db/migrate/20160816161312_add_column_name_to_u2f_registrations.rb
+++ b/db/migrate/20160816161312_add_column_name_to_u2f_registrations.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddColumnNameToU2fRegistrations < ActiveRecord::Migration
+class AddColumnNameToU2fRegistrations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160817133006_add_koding_to_application_settings.rb b/db/migrate/20160817133006_add_koding_to_application_settings.rb
index 46120652d8e..04f9d7be29b 100644
--- a/db/migrate/20160817133006_add_koding_to_application_settings.rb
+++ b/db/migrate/20160817133006_add_koding_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/SaferBooleanColumn
-class AddKodingToApplicationSettings < ActiveRecord::Migration
+class AddKodingToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160817154936_add_discussion_ids_to_notes.rb b/db/migrate/20160817154936_add_discussion_ids_to_notes.rb
index 61facce665a..e735eeadac5 100644
--- a/db/migrate/20160817154936_add_discussion_ids_to_notes.rb
+++ b/db/migrate/20160817154936_add_discussion_ids_to_notes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddDiscussionIdsToNotes < ActiveRecord::Migration
+class AddDiscussionIdsToNotes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160818205718_add_expires_at_to_project_group_links.rb b/db/migrate/20160818205718_add_expires_at_to_project_group_links.rb
index 0ed538b0df8..06f621c6c2e 100644
--- a/db/migrate/20160818205718_add_expires_at_to_project_group_links.rb
+++ b/db/migrate/20160818205718_add_expires_at_to_project_group_links.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddExpiresAtToProjectGroupLinks < ActiveRecord::Migration
+class AddExpiresAtToProjectGroupLinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160819221631_add_index_to_note_discussion_id.rb b/db/migrate/20160819221631_add_index_to_note_discussion_id.rb
index 843643c4e95..1dbc0474fd2 100644
--- a/db/migrate/20160819221631_add_index_to_note_discussion_id.rb
+++ b/db/migrate/20160819221631_add_index_to_note_discussion_id.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexToNoteDiscussionId < ActiveRecord::Migration
+class AddIndexToNoteDiscussionId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160819221833_reset_diff_note_discussion_id_because_it_was_calculated_wrongly.rb b/db/migrate/20160819221833_reset_diff_note_discussion_id_because_it_was_calculated_wrongly.rb
index 0c68cf01900..61f593a52c5 100644
--- a/db/migrate/20160819221833_reset_diff_note_discussion_id_because_it_was_calculated_wrongly.rb
+++ b/db/migrate/20160819221833_reset_diff_note_discussion_id_because_it_was_calculated_wrongly.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ResetDiffNoteDiscussionIdBecauseItWasCalculatedWrongly < ActiveRecord::Migration
+class ResetDiffNoteDiscussionIdBecauseItWasCalculatedWrongly < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160819232256_add_incoming_email_token_to_users.rb b/db/migrate/20160819232256_add_incoming_email_token_to_users.rb
index a004a3802a2..0a7190f632d 100644
--- a/db/migrate/20160819232256_add_incoming_email_token_to_users.rb
+++ b/db/migrate/20160819232256_add_incoming_email_token_to_users.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIncomingEmailTokenToUsers < ActiveRecord::Migration
+class AddIncomingEmailTokenToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160823081327_change_merge_error_to_text.rb b/db/migrate/20160823081327_change_merge_error_to_text.rb
index 7920389cd83..23b4f35a776 100644
--- a/db/migrate/20160823081327_change_merge_error_to_text.rb
+++ b/db/migrate/20160823081327_change_merge_error_to_text.rb
@@ -1,4 +1,4 @@
-class ChangeMergeErrorToText < ActiveRecord::Migration
+class ChangeMergeErrorToText < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20160823083941_add_column_scopes_to_personal_access_tokens.rb b/db/migrate/20160823083941_add_column_scopes_to_personal_access_tokens.rb
index 91479de840b..4c320123088 100644
--- a/db/migrate/20160823083941_add_column_scopes_to_personal_access_tokens.rb
+++ b/db/migrate/20160823083941_add_column_scopes_to_personal_access_tokens.rb
@@ -2,7 +2,7 @@
 # It's easier to achieve this by adding the column with the `['api']` default, and then changing the default to
 # `[]`.
 
-class AddColumnScopesToPersonalAccessTokens < ActiveRecord::Migration
+class AddColumnScopesToPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160823213309_add_lfs_enabled_to_projects.rb b/db/migrate/20160823213309_add_lfs_enabled_to_projects.rb
index c169084e976..87e6e8b6945 100644
--- a/db/migrate/20160823213309_add_lfs_enabled_to_projects.rb
+++ b/db/migrate/20160823213309_add_lfs_enabled_to_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLfsEnabledToProjects < ActiveRecord::Migration
+class AddLfsEnabledToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160824103857_drop_unused_ci_tables.rb b/db/migrate/20160824103857_drop_unused_ci_tables.rb
index 65cf46308d9..8a207683848 100644
--- a/db/migrate/20160824103857_drop_unused_ci_tables.rb
+++ b/db/migrate/20160824103857_drop_unused_ci_tables.rb
@@ -1,4 +1,4 @@
-class DropUnusedCiTables < ActiveRecord::Migration
+class DropUnusedCiTables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160824124900_add_table_issue_metrics.rb b/db/migrate/20160824124900_add_table_issue_metrics.rb
index 49be8bc949b..4f34f377e22 100644
--- a/db/migrate/20160824124900_add_table_issue_metrics.rb
+++ b/db/migrate/20160824124900_add_table_issue_metrics.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 # rubocop:disable Migration/Timestamps
-class AddTableIssueMetrics < ActiveRecord::Migration
+class AddTableIssueMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160825052008_add_table_merge_request_metrics.rb b/db/migrate/20160825052008_add_table_merge_request_metrics.rb
index 3c9dcc08190..150f698869d 100644
--- a/db/migrate/20160825052008_add_table_merge_request_metrics.rb
+++ b/db/migrate/20160825052008_add_table_merge_request_metrics.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 # rubocop:disable Migration/Timestamps
-class AddTableMergeRequestMetrics < ActiveRecord::Migration
+class AddTableMergeRequestMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160827011312_ensure_lock_version_has_no_default.rb b/db/migrate/20160827011312_ensure_lock_version_has_no_default.rb
index 7c55bc23cf2..18c0f0be3eb 100644
--- a/db/migrate/20160827011312_ensure_lock_version_has_no_default.rb
+++ b/db/migrate/20160827011312_ensure_lock_version_has_no_default.rb
@@ -1,4 +1,4 @@
-class EnsureLockVersionHasNoDefault < ActiveRecord::Migration
+class EnsureLockVersionHasNoDefault < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160829114652_add_markdown_cache_columns.rb b/db/migrate/20160829114652_add_markdown_cache_columns.rb
index 6ad7237f4cd..b1c5e38c3c4 100644
--- a/db/migrate/20160829114652_add_markdown_cache_columns.rb
+++ b/db/migrate/20160829114652_add_markdown_cache_columns.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddMarkdownCacheColumns < ActiveRecord::Migration
+class AddMarkdownCacheColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160830203109_add_confidential_issues_events_to_web_hooks.rb b/db/migrate/20160830203109_add_confidential_issues_events_to_web_hooks.rb
index a27947212f6..771a6b84648 100644
--- a/db/migrate/20160830203109_add_confidential_issues_events_to_web_hooks.rb
+++ b/db/migrate/20160830203109_add_confidential_issues_events_to_web_hooks.rb
@@ -1,4 +1,4 @@
-class AddConfidentialIssuesEventsToWebHooks < ActiveRecord::Migration
+class AddConfidentialIssuesEventsToWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160830211132_add_confidential_issues_events_to_services.rb b/db/migrate/20160830211132_add_confidential_issues_events_to_services.rb
index 030e7c39350..a1807264341 100644
--- a/db/migrate/20160830211132_add_confidential_issues_events_to_services.rb
+++ b/db/migrate/20160830211132_add_confidential_issues_events_to_services.rb
@@ -1,4 +1,4 @@
-class AddConfidentialIssuesEventsToServices < ActiveRecord::Migration
+class AddConfidentialIssuesEventsToServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160830232601_change_lock_version_not_null.rb b/db/migrate/20160830232601_change_lock_version_not_null.rb
index 01c58ed5bdc..1e34b57e53f 100644
--- a/db/migrate/20160830232601_change_lock_version_not_null.rb
+++ b/db/migrate/20160830232601_change_lock_version_not_null.rb
@@ -1,4 +1,4 @@
-class ChangeLockVersionNotNull < ActiveRecord::Migration
+class ChangeLockVersionNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160831214002_create_project_features.rb b/db/migrate/20160831214002_create_project_features.rb
index 7ac6c8ec654..e1e61c3a4a2 100644
--- a/db/migrate/20160831214002_create_project_features.rb
+++ b/db/migrate/20160831214002_create_project_features.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateProjectFeatures < ActiveRecord::Migration
+class CreateProjectFeatures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20160831214543_migrate_project_features.rb b/db/migrate/20160831214543_migrate_project_features.rb
index 79a5fb29d64..ba7ffd7c9f2 100644
--- a/db/migrate/20160831214543_migrate_project_features.rb
+++ b/db/migrate/20160831214543_migrate_project_features.rb
@@ -1,4 +1,4 @@
-class MigrateProjectFeatures < ActiveRecord::Migration
+class MigrateProjectFeatures < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20160831223750_remove_features_enabled_from_projects.rb b/db/migrate/20160831223750_remove_features_enabled_from_projects.rb
index 9eafd8b9477..6d39d42882b 100644
--- a/db/migrate/20160831223750_remove_features_enabled_from_projects.rb
+++ b/db/migrate/20160831223750_remove_features_enabled_from_projects.rb
@@ -3,7 +3,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/UpdateLargeTable
-class RemoveFeaturesEnabledFromProjects < ActiveRecord::Migration
+class RemoveFeaturesEnabledFromProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20160901141443_set_confidential_issues_events_on_webhooks.rb b/db/migrate/20160901141443_set_confidential_issues_events_on_webhooks.rb
index f8486e3e1a6..2921bb566c9 100644
--- a/db/migrate/20160901141443_set_confidential_issues_events_on_webhooks.rb
+++ b/db/migrate/20160901141443_set_confidential_issues_events_on_webhooks.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateColumnInBatches
-class SetConfidentialIssuesEventsOnWebhooks < ActiveRecord::Migration
+class SetConfidentialIssuesEventsOnWebhooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160901213340_add_lfs_enabled_to_namespaces.rb b/db/migrate/20160901213340_add_lfs_enabled_to_namespaces.rb
index fd413d1ca8c..1be5f3f6ab0 100644
--- a/db/migrate/20160901213340_add_lfs_enabled_to_namespaces.rb
+++ b/db/migrate/20160901213340_add_lfs_enabled_to_namespaces.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLfsEnabledToNamespaces < ActiveRecord::Migration
+class AddLfsEnabledToNamespaces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160902122721_drop_gitorious_field_from_application_settings.rb b/db/migrate/20160902122721_drop_gitorious_field_from_application_settings.rb
index a80a57254dd..6c2dc58876e 100644
--- a/db/migrate/20160902122721_drop_gitorious_field_from_application_settings.rb
+++ b/db/migrate/20160902122721_drop_gitorious_field_from_application_settings.rb
@@ -1,4 +1,4 @@
-class DropGitoriousFieldFromApplicationSettings < ActiveRecord::Migration
+class DropGitoriousFieldFromApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # After the deploy the caches will be cold anyway
diff --git a/db/migrate/20160907131111_add_environment_type_to_environments.rb b/db/migrate/20160907131111_add_environment_type_to_environments.rb
index fac73753d5b..34463178fca 100644
--- a/db/migrate/20160907131111_add_environment_type_to_environments.rb
+++ b/db/migrate/20160907131111_add_environment_type_to_environments.rb
@@ -1,4 +1,4 @@
-class AddEnvironmentTypeToEnvironments < ActiveRecord::Migration
+class AddEnvironmentTypeToEnvironments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160913162434_remove_projects_pushes_since_gc.rb b/db/migrate/20160913162434_remove_projects_pushes_since_gc.rb
index f32167037e0..51650c68170 100644
--- a/db/migrate/20160913162434_remove_projects_pushes_since_gc.rb
+++ b/db/migrate/20160913162434_remove_projects_pushes_since_gc.rb
@@ -3,7 +3,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/UpdateLargeTable
-class RemoveProjectsPushesSinceGc < ActiveRecord::Migration
+class RemoveProjectsPushesSinceGc < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20160913212128_change_artifacts_size_column.rb b/db/migrate/20160913212128_change_artifacts_size_column.rb
index 063bbca537c..f2c2aaff9a8 100644
--- a/db/migrate/20160913212128_change_artifacts_size_column.rb
+++ b/db/migrate/20160913212128_change_artifacts_size_column.rb
@@ -1,4 +1,4 @@
-class ChangeArtifactsSizeColumn < ActiveRecord::Migration
+class ChangeArtifactsSizeColumn < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20160914131004_only_allow_merge_if_all_discussions_are_resolved.rb b/db/migrate/20160914131004_only_allow_merge_if_all_discussions_are_resolved.rb
index 4da5ec9bd28..81511f9861b 100644
--- a/db/migrate/20160914131004_only_allow_merge_if_all_discussions_are_resolved.rb
+++ b/db/migrate/20160914131004_only_allow_merge_if_all_discussions_are_resolved.rb
@@ -1,4 +1,4 @@
-class OnlyAllowMergeIfAllDiscussionsAreResolved < ActiveRecord::Migration
+class OnlyAllowMergeIfAllDiscussionsAreResolved < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160915042921_create_merge_requests_closing_issues.rb b/db/migrate/20160915042921_create_merge_requests_closing_issues.rb
index 10c5604bb5c..3efe8c8901b 100644
--- a/db/migrate/20160915042921_create_merge_requests_closing_issues.rb
+++ b/db/migrate/20160915042921_create_merge_requests_closing_issues.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/Timestamps
-class CreateMergeRequestsClosingIssues < ActiveRecord::Migration
+class CreateMergeRequestsClosingIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20160919144305_add_type_to_labels.rb b/db/migrate/20160919144305_add_type_to_labels.rb
index d08b339cd27..f897646d264 100644
--- a/db/migrate/20160919144305_add_type_to_labels.rb
+++ b/db/migrate/20160919144305_add_type_to_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateColumnInBatches
-class AddTypeToLabels < ActiveRecord::Migration
+class AddTypeToLabels < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20160919145149_add_group_id_to_labels.rb b/db/migrate/20160919145149_add_group_id_to_labels.rb
index 917c2b0c521..df11a2fc4c8 100644
--- a/db/migrate/20160919145149_add_group_id_to_labels.rb
+++ b/db/migrate/20160919145149_add_group_id_to_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddGroupIdToLabels < ActiveRecord::Migration
+class AddGroupIdToLabels < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160920160832_add_index_to_labels_title.rb b/db/migrate/20160920160832_add_index_to_labels_title.rb
index e38c655baee..e6c87836d4e 100644
--- a/db/migrate/20160920160832_add_index_to_labels_title.rb
+++ b/db/migrate/20160920160832_add_index_to_labels_title.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToLabelsTitle < ActiveRecord::Migration
+class AddIndexToLabelsTitle < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20160926145521_add_organization_to_user.rb b/db/migrate/20160926145521_add_organization_to_user.rb
index e0bef6e7548..2d8d907591d 100644
--- a/db/migrate/20160926145521_add_organization_to_user.rb
+++ b/db/migrate/20160926145521_add_organization_to_user.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddOrganizationToUser < ActiveRecord::Migration
+class AddOrganizationToUser < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161006104309_add_state_to_environment.rb b/db/migrate/20161006104309_add_state_to_environment.rb
index ccb546654f9..c51dada9bca 100644
--- a/db/migrate/20161006104309_add_state_to_environment.rb
+++ b/db/migrate/20161006104309_add_state_to_environment.rb
@@ -1,4 +1,4 @@
-class AddStateToEnvironment < ActiveRecord::Migration
+class AddStateToEnvironment < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161007073613_create_user_activities.rb b/db/migrate/20161007073613_create_user_activities.rb
index 1d694e777a1..be3ecb17eef 100644
--- a/db/migrate/20161007073613_create_user_activities.rb
+++ b/db/migrate/20161007073613_create_user_activities.rb
@@ -1,4 +1,4 @@
-class CreateUserActivities < ActiveRecord::Migration
+class CreateUserActivities < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   # This migration is a no-op. It just exists to match EE.
diff --git a/db/migrate/20161007133303_precalculate_trending_projects.rb b/db/migrate/20161007133303_precalculate_trending_projects.rb
index b324cd94268..c7a678c9d8f 100644
--- a/db/migrate/20161007133303_precalculate_trending_projects.rb
+++ b/db/migrate/20161007133303_precalculate_trending_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PrecalculateTrendingProjects < ActiveRecord::Migration
+class PrecalculateTrendingProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161010142410_create_project_authorizations.rb b/db/migrate/20161010142410_create_project_authorizations.rb
index e095ab969f8..b340a4ece19 100644
--- a/db/migrate/20161010142410_create_project_authorizations.rb
+++ b/db/migrate/20161010142410_create_project_authorizations.rb
@@ -1,4 +1,4 @@
-class CreateProjectAuthorizations < ActiveRecord::Migration
+class CreateProjectAuthorizations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161012180455_add_repository_access_level_to_project_feature.rb b/db/migrate/20161012180455_add_repository_access_level_to_project_feature.rb
index 7b33da3ea11..3024ea81ed8 100644
--- a/db/migrate/20161012180455_add_repository_access_level_to_project_feature.rb
+++ b/db/migrate/20161012180455_add_repository_access_level_to_project_feature.rb
@@ -1,4 +1,4 @@
-class AddRepositoryAccessLevelToProjectFeature < ActiveRecord::Migration
+class AddRepositoryAccessLevelToProjectFeature < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20161014173530_create_label_priorities.rb b/db/migrate/20161014173530_create_label_priorities.rb
index 28937c81e02..c7d60caa7d1 100644
--- a/db/migrate/20161014173530_create_label_priorities.rb
+++ b/db/migrate/20161014173530_create_label_priorities.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateLabelPriorities < ActiveRecord::Migration
+class CreateLabelPriorities < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161017091941_add_authorized_projects_populated_to_users.rb b/db/migrate/20161017091941_add_authorized_projects_populated_to_users.rb
index 8f6be9dd677..11f4fa1a1f7 100644
--- a/db/migrate/20161017091941_add_authorized_projects_populated_to_users.rb
+++ b/db/migrate/20161017091941_add_authorized_projects_populated_to_users.rb
@@ -1,4 +1,4 @@
-class AddAuthorizedProjectsPopulatedToUsers < ActiveRecord::Migration
+class AddAuthorizedProjectsPopulatedToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161017095000_add_properties_to_deployment.rb b/db/migrate/20161017095000_add_properties_to_deployment.rb
index f620ee0de1c..31bd4cd24ad 100644
--- a/db/migrate/20161017095000_add_properties_to_deployment.rb
+++ b/db/migrate/20161017095000_add_properties_to_deployment.rb
@@ -1,4 +1,4 @@
-class AddPropertiesToDeployment < ActiveRecord::Migration
+class AddPropertiesToDeployment < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161017125927_add_unique_index_to_labels.rb b/db/migrate/20161017125927_add_unique_index_to_labels.rb
index fcdd79d3b02..b5326789f52 100644
--- a/db/migrate/20161017125927_add_unique_index_to_labels.rb
+++ b/db/migrate/20161017125927_add_unique_index_to_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddUniqueIndexToLabels < ActiveRecord::Migration
+class AddUniqueIndexToLabels < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161018024215_migrate_labels_priority.rb b/db/migrate/20161018024215_migrate_labels_priority.rb
index 22bec2382f4..3e2540c134c 100644
--- a/db/migrate/20161018024215_migrate_labels_priority.rb
+++ b/db/migrate/20161018024215_migrate_labels_priority.rb
@@ -1,4 +1,4 @@
-class MigrateLabelsPriority < ActiveRecord::Migration
+class MigrateLabelsPriority < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161018024550_remove_priority_from_labels.rb b/db/migrate/20161018024550_remove_priority_from_labels.rb
index bc25a43526c..e164d959bdf 100644
--- a/db/migrate/20161018024550_remove_priority_from_labels.rb
+++ b/db/migrate/20161018024550_remove_priority_from_labels.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/RemoveColumn
-class RemovePriorityFromLabels < ActiveRecord::Migration
+class RemovePriorityFromLabels < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161018124658_make_project_owners_masters.rb b/db/migrate/20161018124658_make_project_owners_masters.rb
index cb93b449067..132c17388dc 100644
--- a/db/migrate/20161018124658_make_project_owners_masters.rb
+++ b/db/migrate/20161018124658_make_project_owners_masters.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateColumnInBatches
-class MakeProjectOwnersMasters < ActiveRecord::Migration
+class MakeProjectOwnersMasters < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161019190736_migrate_sidekiq_queues_from_default.rb b/db/migrate/20161019190736_migrate_sidekiq_queues_from_default.rb
index 9f502a8df73..fc6d9784638 100644
--- a/db/migrate/20161019190736_migrate_sidekiq_queues_from_default.rb
+++ b/db/migrate/20161019190736_migrate_sidekiq_queues_from_default.rb
@@ -3,7 +3,7 @@ require 'json'
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateSidekiqQueuesFromDefault < ActiveRecord::Migration
+class MigrateSidekiqQueuesFromDefault < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161019213545_generate_project_feature_for_projects.rb b/db/migrate/20161019213545_generate_project_feature_for_projects.rb
index 4554e14b0df..587bdf60f70 100644
--- a/db/migrate/20161019213545_generate_project_feature_for_projects.rb
+++ b/db/migrate/20161019213545_generate_project_feature_for_projects.rb
@@ -1,4 +1,4 @@
-class GenerateProjectFeatureForProjects < ActiveRecord::Migration
+class GenerateProjectFeatureForProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = true
 
   DOWNTIME_REASON = <<-HEREDOC
diff --git a/db/migrate/20161020075734_default_request_access_groups.rb b/db/migrate/20161020075734_default_request_access_groups.rb
index 9721cc88724..72aec86167e 100644
--- a/db/migrate/20161020075734_default_request_access_groups.rb
+++ b/db/migrate/20161020075734_default_request_access_groups.rb
@@ -1,4 +1,4 @@
-class DefaultRequestAccessGroups < ActiveRecord::Migration
+class DefaultRequestAccessGroups < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/migrate/20161020075830_default_request_access_projects.rb b/db/migrate/20161020075830_default_request_access_projects.rb
index a3a53350e8d..b457e39f838 100644
--- a/db/migrate/20161020075830_default_request_access_projects.rb
+++ b/db/migrate/20161020075830_default_request_access_projects.rb
@@ -1,4 +1,4 @@
-class DefaultRequestAccessProjects < ActiveRecord::Migration
+class DefaultRequestAccessProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb b/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb
index b77daf12f68..60352363e42 100644
--- a/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb
+++ b/db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddPipelineIdToMergeRequestMetrics < ActiveRecord::Migration
+class AddPipelineIdToMergeRequestMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161020180657_add_minimum_key_length_to_application_settings.rb b/db/migrate/20161020180657_add_minimum_key_length_to_application_settings.rb
index 5b6079002c0..7839bee6a5b 100644
--- a/db/migrate/20161020180657_add_minimum_key_length_to_application_settings.rb
+++ b/db/migrate/20161020180657_add_minimum_key_length_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddMinimumKeyLengthToApplicationSettings < ActiveRecord::Migration
+class AddMinimumKeyLengthToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161021114307_add_lock_version_to_build_and_pipelines.rb b/db/migrate/20161021114307_add_lock_version_to_build_and_pipelines.rb
index b47f3aa2810..e172dc3adf2 100644
--- a/db/migrate/20161021114307_add_lock_version_to_build_and_pipelines.rb
+++ b/db/migrate/20161021114307_add_lock_version_to_build_and_pipelines.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLockVersionToBuildAndPipelines < ActiveRecord::Migration
+class AddLockVersionToBuildAndPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161024042317_migrate_mailroom_queue_from_default.rb b/db/migrate/20161024042317_migrate_mailroom_queue_from_default.rb
index fc2e4c12b30..d27f8fc38c8 100644
--- a/db/migrate/20161024042317_migrate_mailroom_queue_from_default.rb
+++ b/db/migrate/20161024042317_migrate_mailroom_queue_from_default.rb
@@ -3,7 +3,7 @@ require 'json'
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateMailroomQueueFromDefault < ActiveRecord::Migration
+class MigrateMailroomQueueFromDefault < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161025231710_migrate_jira_to_gem.rb b/db/migrate/20161025231710_migrate_jira_to_gem.rb
index 870b00411d2..aa1c59ec9e6 100644
--- a/db/migrate/20161025231710_migrate_jira_to_gem.rb
+++ b/db/migrate/20161025231710_migrate_jira_to_gem.rb
@@ -1,4 +1,4 @@
-class MigrateJiraToGem < ActiveRecord::Migration
+class MigrateJiraToGem < ActiveRecord::Migration[4.2]
   DOWNTIME = true
 
   DOWNTIME_REASON = <<-HEREDOC
diff --git a/db/migrate/20161031155516_add_housekeeping_to_application_settings.rb b/db/migrate/20161031155516_add_housekeeping_to_application_settings.rb
index 5a451fb575b..963358fe3e5 100644
--- a/db/migrate/20161031155516_add_housekeeping_to_application_settings.rb
+++ b/db/migrate/20161031155516_add_housekeeping_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddHousekeepingToApplicationSettings < ActiveRecord::Migration
+class AddHousekeepingToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161031171301_add_project_id_to_subscriptions.rb b/db/migrate/20161031171301_add_project_id_to_subscriptions.rb
index 8b1c10a124f..5fd10d9b359 100644
--- a/db/migrate/20161031171301_add_project_id_to_subscriptions.rb
+++ b/db/migrate/20161031171301_add_project_id_to_subscriptions.rb
@@ -1,4 +1,4 @@
-class AddProjectIdToSubscriptions < ActiveRecord::Migration
+class AddProjectIdToSubscriptions < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161031174110_migrate_subscriptions_project_id.rb b/db/migrate/20161031174110_migrate_subscriptions_project_id.rb
index 549145a0a65..7f4087fdcd3 100644
--- a/db/migrate/20161031174110_migrate_subscriptions_project_id.rb
+++ b/db/migrate/20161031174110_migrate_subscriptions_project_id.rb
@@ -1,4 +1,4 @@
-class MigrateSubscriptionsProjectId < ActiveRecord::Migration
+class MigrateSubscriptionsProjectId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161031181638_add_unique_index_to_subscriptions.rb b/db/migrate/20161031181638_add_unique_index_to_subscriptions.rb
index f263377fbc6..23a775d6282 100644
--- a/db/migrate/20161031181638_add_unique_index_to_subscriptions.rb
+++ b/db/migrate/20161031181638_add_unique_index_to_subscriptions.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddUniqueIndexToSubscriptions < ActiveRecord::Migration
+class AddUniqueIndexToSubscriptions < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161103171205_rename_repository_storage_column.rb b/db/migrate/20161103171205_rename_repository_storage_column.rb
index 93280573939..d6050500e47 100644
--- a/db/migrate/20161103171205_rename_repository_storage_column.rb
+++ b/db/migrate/20161103171205_rename_repository_storage_column.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameRepositoryStorageColumn < ActiveRecord::Migration
+class RenameRepositoryStorageColumn < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161103191444_add_sidekiq_throttling_to_application_settings.rb b/db/migrate/20161103191444_add_sidekiq_throttling_to_application_settings.rb
index 522437b92b4..83c51c83509 100644
--- a/db/migrate/20161103191444_add_sidekiq_throttling_to_application_settings.rb
+++ b/db/migrate/20161103191444_add_sidekiq_throttling_to_application_settings.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/SaferBooleanColumn
-class AddSidekiqThrottlingToApplicationSettings < ActiveRecord::Migration
+class AddSidekiqThrottlingToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161106185620_add_project_import_data_project_index.rb b/db/migrate/20161106185620_add_project_import_data_project_index.rb
index b3746dc4f6c..46809ca1707 100644
--- a/db/migrate/20161106185620_add_project_import_data_project_index.rb
+++ b/db/migrate/20161106185620_add_project_import_data_project_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddProjectImportDataProjectIndex < ActiveRecord::Migration
+class AddProjectImportDataProjectIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161113184239_create_user_chat_names_table.rb b/db/migrate/20161113184239_create_user_chat_names_table.rb
index 7bead07fd76..0031ca66afe 100644
--- a/db/migrate/20161113184239_create_user_chat_names_table.rb
+++ b/db/migrate/20161113184239_create_user_chat_names_table.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateUserChatNamesTable < ActiveRecord::Migration
+class CreateUserChatNamesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161114024742_add_coverage_regex_to_builds.rb b/db/migrate/20161114024742_add_coverage_regex_to_builds.rb
index 88aa5d52b39..631968b4aee 100644
--- a/db/migrate/20161114024742_add_coverage_regex_to_builds.rb
+++ b/db/migrate/20161114024742_add_coverage_regex_to_builds.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddCoverageRegexToBuilds < ActiveRecord::Migration
+class AddCoverageRegexToBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161115173905_add_start_date_to_milestones.rb b/db/migrate/20161115173905_add_start_date_to_milestones.rb
index 413733b8db7..847c4f0bebb 100644
--- a/db/migrate/20161115173905_add_start_date_to_milestones.rb
+++ b/db/migrate/20161115173905_add_start_date_to_milestones.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddStartDateToMilestones < ActiveRecord::Migration
+class AddStartDateToMilestones < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161117114805_remove_undeleted_groups.rb b/db/migrate/20161117114805_remove_undeleted_groups.rb
index 29040583aa2..0a4fe1c05b7 100644
--- a/db/migrate/20161117114805_remove_undeleted_groups.rb
+++ b/db/migrate/20161117114805_remove_undeleted_groups.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveUndeletedGroups < ActiveRecord::Migration
+class RemoveUndeletedGroups < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20161118183841_add_commit_events_to_services.rb b/db/migrate/20161118183841_add_commit_events_to_services.rb
index 4f9b5dd2281..0eb08915118 100644
--- a/db/migrate/20161118183841_add_commit_events_to_services.rb
+++ b/db/migrate/20161118183841_add_commit_events_to_services.rb
@@ -1,4 +1,4 @@
-class AddCommitEventsToServices < ActiveRecord::Migration
+class AddCommitEventsToServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161124111390_add_parent_id_to_namespace.rb b/db/migrate/20161124111390_add_parent_id_to_namespace.rb
index a6fa1b70a9d..67f6aee2b9c 100644
--- a/db/migrate/20161124111390_add_parent_id_to_namespace.rb
+++ b/db/migrate/20161124111390_add_parent_id_to_namespace.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddParentIdToNamespace < ActiveRecord::Migration
+class AddParentIdToNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161124111395_add_index_to_parent_id.rb b/db/migrate/20161124111395_add_index_to_parent_id.rb
index 065643e058d..d7a51ec905a 100644
--- a/db/migrate/20161124111395_add_index_to_parent_id.rb
+++ b/db/migrate/20161124111395_add_index_to_parent_id.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexToParentId < ActiveRecord::Migration
+class AddIndexToParentId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161124111402_add_routes_table.rb b/db/migrate/20161124111402_add_routes_table.rb
index f5241d906d1..36f49ef8c97 100644
--- a/db/migrate/20161124111402_add_routes_table.rb
+++ b/db/migrate/20161124111402_add_routes_table.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/Timestamps
-class AddRoutesTable < ActiveRecord::Migration
+class AddRoutesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161124141322_migrate_process_commit_worker_jobs.rb b/db/migrate/20161124141322_migrate_process_commit_worker_jobs.rb
index 1eb6a8fa5df..0772821210c 100644
--- a/db/migrate/20161124141322_migrate_process_commit_worker_jobs.rb
+++ b/db/migrate/20161124141322_migrate_process_commit_worker_jobs.rb
@@ -1,4 +1,4 @@
-class MigrateProcessCommitWorkerJobs < ActiveRecord::Migration
+class MigrateProcessCommitWorkerJobs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class Repository
diff --git a/db/migrate/20161128095517_add_in_reply_to_discussion_id_to_sent_notifications.rb b/db/migrate/20161128095517_add_in_reply_to_discussion_id_to_sent_notifications.rb
index d56d83ca1d3..a2971486014 100644
--- a/db/migrate/20161128095517_add_in_reply_to_discussion_id_to_sent_notifications.rb
+++ b/db/migrate/20161128095517_add_in_reply_to_discussion_id_to_sent_notifications.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddInReplyToDiscussionIdToSentNotifications < ActiveRecord::Migration
+class AddInReplyToDiscussionIdToSentNotifications < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161128142110_remove_unnecessary_indexes.rb b/db/migrate/20161128142110_remove_unnecessary_indexes.rb
index 699a9368eb3..b6c6e303ec7 100644
--- a/db/migrate/20161128142110_remove_unnecessary_indexes.rb
+++ b/db/migrate/20161128142110_remove_unnecessary_indexes.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class RemoveUnnecessaryIndexes < ActiveRecord::Migration
+class RemoveUnnecessaryIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20161128161412_add_html_emails_enabled_to_application_settings.rb b/db/migrate/20161128161412_add_html_emails_enabled_to_application_settings.rb
index 38f5781745b..63139eb97bd 100644
--- a/db/migrate/20161128161412_add_html_emails_enabled_to_application_settings.rb
+++ b/db/migrate/20161128161412_add_html_emails_enabled_to_application_settings.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/SaferBooleanColumn
-class AddHtmlEmailsEnabledToApplicationSettings < ActiveRecord::Migration
+class AddHtmlEmailsEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161130095245_fill_routes_table.rb b/db/migrate/20161130095245_fill_routes_table.rb
index c3536d6d911..712be187c7c 100644
--- a/db/migrate/20161130095245_fill_routes_table.rb
+++ b/db/migrate/20161130095245_fill_routes_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class FillRoutesTable < ActiveRecord::Migration
+class FillRoutesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161130101252_fill_projects_routes_table.rb b/db/migrate/20161130101252_fill_projects_routes_table.rb
index 56ba6fcdbe3..1900d6c8013 100644
--- a/db/migrate/20161130101252_fill_projects_routes_table.rb
+++ b/db/migrate/20161130101252_fill_projects_routes_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class FillProjectsRoutesTable < ActiveRecord::Migration
+class FillProjectsRoutesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161201001911_add_plant_uml_url_to_application_settings.rb b/db/migrate/20161201001911_add_plant_uml_url_to_application_settings.rb
index b8d8742ae40..79558a6b3b9 100644
--- a/db/migrate/20161201001911_add_plant_uml_url_to_application_settings.rb
+++ b/db/migrate/20161201001911_add_plant_uml_url_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPlantUmlUrlToApplicationSettings < ActiveRecord::Migration
+class AddPlantUmlUrlToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161201155511_create_project_statistics.rb b/db/migrate/20161201155511_create_project_statistics.rb
index 26e6d3623eb..6dcb5adb82b 100644
--- a/db/migrate/20161201155511_create_project_statistics.rb
+++ b/db/migrate/20161201155511_create_project_statistics.rb
@@ -1,4 +1,4 @@
-class CreateProjectStatistics < ActiveRecord::Migration
+class CreateProjectStatistics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161201160452_migrate_project_statistics.rb b/db/migrate/20161201160452_migrate_project_statistics.rb
index a547409aaa5..42c5be07e83 100644
--- a/db/migrate/20161201160452_migrate_project_statistics.rb
+++ b/db/migrate/20161201160452_migrate_project_statistics.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/RemoveColumn
-class MigrateProjectStatistics < ActiveRecord::Migration
+class MigrateProjectStatistics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161202152031_remove_duplicates_from_routes.rb b/db/migrate/20161202152031_remove_duplicates_from_routes.rb
index d73b0847506..0615f683859 100644
--- a/db/migrate/20161202152031_remove_duplicates_from_routes.rb
+++ b/db/migrate/20161202152031_remove_duplicates_from_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDuplicatesFromRoutes < ActiveRecord::Migration
+class RemoveDuplicatesFromRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161202152035_add_index_to_routes.rb b/db/migrate/20161202152035_add_index_to_routes.rb
index 552b5fab68c..ad2e0cd13c9 100644
--- a/db/migrate/20161202152035_add_index_to_routes.rb
+++ b/db/migrate/20161202152035_add_index_to_routes.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexToRoutes < ActiveRecord::Migration
+class AddIndexToRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161206003819_add_plant_uml_enabled_to_application_settings.rb b/db/migrate/20161206003819_add_plant_uml_enabled_to_application_settings.rb
index 7f56ecf4c9e..bb44d56ee56 100644
--- a/db/migrate/20161206003819_add_plant_uml_enabled_to_application_settings.rb
+++ b/db/migrate/20161206003819_add_plant_uml_enabled_to_application_settings.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/SaferBooleanColumn
-class AddPlantUmlEnabledToApplicationSettings < ActiveRecord::Migration
+class AddPlantUmlEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161206153749_remove_uniq_path_index_from_namespace.rb b/db/migrate/20161206153749_remove_uniq_path_index_from_namespace.rb
index 7d39c2ae626..c301d76646e 100644
--- a/db/migrate/20161206153749_remove_uniq_path_index_from_namespace.rb
+++ b/db/migrate/20161206153749_remove_uniq_path_index_from_namespace.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class RemoveUniqPathIndexFromNamespace < ActiveRecord::Migration
+class RemoveUniqPathIndexFromNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161206153751_add_path_index_to_namespace.rb b/db/migrate/20161206153751_add_path_index_to_namespace.rb
index 623037e35cd..f0848cc59a5 100644
--- a/db/migrate/20161206153751_add_path_index_to_namespace.rb
+++ b/db/migrate/20161206153751_add_path_index_to_namespace.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddPathIndexToNamespace < ActiveRecord::Migration
+class AddPathIndexToNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161206153753_remove_uniq_name_index_from_namespace.rb b/db/migrate/20161206153753_remove_uniq_name_index_from_namespace.rb
index 9296ae36aa5..13660cec7aa 100644
--- a/db/migrate/20161206153753_remove_uniq_name_index_from_namespace.rb
+++ b/db/migrate/20161206153753_remove_uniq_name_index_from_namespace.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class RemoveUniqNameIndexFromNamespace < ActiveRecord::Migration
+class RemoveUniqNameIndexFromNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161206153754_add_name_index_to_namespace.rb b/db/migrate/20161206153754_add_name_index_to_namespace.rb
index 2bbd039ff27..14152a6dc07 100644
--- a/db/migrate/20161206153754_add_name_index_to_namespace.rb
+++ b/db/migrate/20161206153754_add_name_index_to_namespace.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddNameIndexToNamespace < ActiveRecord::Migration
+class AddNameIndexToNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161207231620_fixup_environment_name_uniqueness.rb b/db/migrate/20161207231620_fixup_environment_name_uniqueness.rb
index 1db8c68626a..7cae09021cd 100644
--- a/db/migrate/20161207231620_fixup_environment_name_uniqueness.rb
+++ b/db/migrate/20161207231620_fixup_environment_name_uniqueness.rb
@@ -1,4 +1,4 @@
-class FixupEnvironmentNameUniqueness < ActiveRecord::Migration
+class FixupEnvironmentNameUniqueness < ActiveRecord::Migration[4.2]
   include Gitlab::Database::ArelMethods
   include Gitlab::Database::MigrationHelpers
 
diff --git a/db/migrate/20161207231621_create_environment_name_unique_index.rb b/db/migrate/20161207231621_create_environment_name_unique_index.rb
index 15093350f12..28d22664405 100644
--- a/db/migrate/20161207231621_create_environment_name_unique_index.rb
+++ b/db/migrate/20161207231621_create_environment_name_unique_index.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class CreateEnvironmentNameUniqueIndex < ActiveRecord::Migration
+class CreateEnvironmentNameUniqueIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20161207231626_add_environment_slug.rb b/db/migrate/20161207231626_add_environment_slug.rb
index 162f82a01cb..4657b023dfa 100644
--- a/db/migrate/20161207231626_add_environment_slug.rb
+++ b/db/migrate/20161207231626_add_environment_slug.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddEnvironmentSlug < ActiveRecord::Migration
+class AddEnvironmentSlug < ActiveRecord::Migration[4.2]
   include Gitlab::Database::ArelMethods
   include Gitlab::Database::MigrationHelpers
 
diff --git a/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb b/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
index 42a90091b87..57606a33cb9 100644
--- a/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
+++ b/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddUniqueIndexForEnvironmentSlug < ActiveRecord::Migration
+class AddUniqueIndexForEnvironmentSlug < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20161209165216_create_doorkeeper_openid_connect_tables.rb b/db/migrate/20161209165216_create_doorkeeper_openid_connect_tables.rb
index e63d5927f86..e8ea9cf8fda 100644
--- a/db/migrate/20161209165216_create_doorkeeper_openid_connect_tables.rb
+++ b/db/migrate/20161209165216_create_doorkeeper_openid_connect_tables.rb
@@ -1,4 +1,4 @@
-class CreateDoorkeeperOpenidConnectTables < ActiveRecord::Migration
+class CreateDoorkeeperOpenidConnectTables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161212142807_add_lower_path_index_to_routes.rb b/db/migrate/20161212142807_add_lower_path_index_to_routes.rb
index 76db5179795..92a12dbc699 100644
--- a/db/migrate/20161212142807_add_lower_path_index_to_routes.rb
+++ b/db/migrate/20161212142807_add_lower_path_index_to_routes.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddLowerPathIndexToRoutes < ActiveRecord::Migration
+class AddLowerPathIndexToRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161213172958_change_slack_service_to_slack_notification_service.rb b/db/migrate/20161213172958_change_slack_service_to_slack_notification_service.rb
index dc38d0ac906..babac6bfc4f 100644
--- a/db/migrate/20161213172958_change_slack_service_to_slack_notification_service.rb
+++ b/db/migrate/20161213172958_change_slack_service_to_slack_notification_service.rb
@@ -1,4 +1,4 @@
-class ChangeSlackServiceToSlackNotificationService < ActiveRecord::Migration
+class ChangeSlackServiceToSlackNotificationService < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161220141214_remove_dot_git_from_group_names.rb b/db/migrate/20161220141214_remove_dot_git_from_group_names.rb
index 17357b67ab7..5c0b083325e 100644
--- a/db/migrate/20161220141214_remove_dot_git_from_group_names.rb
+++ b/db/migrate/20161220141214_remove_dot_git_from_group_names.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDotGitFromGroupNames < ActiveRecord::Migration
+class RemoveDotGitFromGroupNames < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   include Gitlab::ShellAdapter
 
diff --git a/db/migrate/20161221152132_add_last_used_at_to_key.rb b/db/migrate/20161221152132_add_last_used_at_to_key.rb
index 86dc7870247..a5b3f2b6f4b 100644
--- a/db/migrate/20161221152132_add_last_used_at_to_key.rb
+++ b/db/migrate/20161221152132_add_last_used_at_to_key.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddLastUsedAtToKey < ActiveRecord::Migration
+class AddLastUsedAtToKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161223034433_add_estimate_to_issuables_ce.rb b/db/migrate/20161223034433_add_estimate_to_issuables_ce.rb
index d5116dfab49..75bea41387c 100644
--- a/db/migrate/20161223034433_add_estimate_to_issuables_ce.rb
+++ b/db/migrate/20161223034433_add_estimate_to_issuables_ce.rb
@@ -1,4 +1,4 @@
-class AddEstimateToIssuablesCe < ActiveRecord::Migration
+class AddEstimateToIssuablesCe < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161223034646_create_timelogs_ce.rb b/db/migrate/20161223034646_create_timelogs_ce.rb
index 1e894cc9161..489a2b35dfd 100644
--- a/db/migrate/20161223034646_create_timelogs_ce.rb
+++ b/db/migrate/20161223034646_create_timelogs_ce.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateTimelogsCe < ActiveRecord::Migration
+class CreateTimelogsCe < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161226122833_remove_dot_git_from_usernames.rb b/db/migrate/20161226122833_remove_dot_git_from_usernames.rb
index db10426b483..e3318780151 100644
--- a/db/migrate/20161226122833_remove_dot_git_from_usernames.rb
+++ b/db/migrate/20161226122833_remove_dot_git_from_usernames.rb
@@ -1,4 +1,4 @@
-class RemoveDotGitFromUsernames < ActiveRecord::Migration
+class RemoveDotGitFromUsernames < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   include Gitlab::ShellAdapter
 
diff --git a/db/migrate/20161227192806_rename_slack_and_mattermost_notification_services.rb b/db/migrate/20161227192806_rename_slack_and_mattermost_notification_services.rb
index 6b15e5caccf..df5714278f2 100644
--- a/db/migrate/20161227192806_rename_slack_and_mattermost_notification_services.rb
+++ b/db/migrate/20161227192806_rename_slack_and_mattermost_notification_services.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateColumnInBatches
-class RenameSlackAndMattermostNotificationServices < ActiveRecord::Migration
+class RenameSlackAndMattermostNotificationServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20161228124936_change_expires_at_to_date_in_personal_access_tokens.rb b/db/migrate/20161228124936_change_expires_at_to_date_in_personal_access_tokens.rb
index 16f7cc487ce..f9f8f11316d 100644
--- a/db/migrate/20161228124936_change_expires_at_to_date_in_personal_access_tokens.rb
+++ b/db/migrate/20161228124936_change_expires_at_to_date_in_personal_access_tokens.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/Datetime
-class ChangeExpiresAtToDateInPersonalAccessTokens < ActiveRecord::Migration
+class ChangeExpiresAtToDateInPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20161228135550_add_impersonation_to_personal_access_tokens.rb b/db/migrate/20161228135550_add_impersonation_to_personal_access_tokens.rb
index ea9caceaa2c..489d7fb8b75 100644
--- a/db/migrate/20161228135550_add_impersonation_to_personal_access_tokens.rb
+++ b/db/migrate/20161228135550_add_impersonation_to_personal_access_tokens.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddImpersonationToPersonalAccessTokens < ActiveRecord::Migration
+class AddImpersonationToPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170120131253_create_chat_teams.rb b/db/migrate/20170120131253_create_chat_teams.rb
index 52208821911..e9b9bd7bd2f 100644
--- a/db/migrate/20170120131253_create_chat_teams.rb
+++ b/db/migrate/20170120131253_create_chat_teams.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateChatTeams < ActiveRecord::Migration
+class CreateChatTeams < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb b/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb
index c006098fafd..cc1a4d2db59 100644
--- a/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb
+++ b/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToCiBuildsForStatusRunnerIdAndType < ActiveRecord::Migration
+class AddIndexToCiBuildsForStatusRunnerIdAndType < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170121130655_add_index_to_ci_runners_for_is_shared.rb b/db/migrate/20170121130655_add_index_to_ci_runners_for_is_shared.rb
index 00aa0b311b1..1b83ce4cfe3 100644
--- a/db/migrate/20170121130655_add_index_to_ci_runners_for_is_shared.rb
+++ b/db/migrate/20170121130655_add_index_to_ci_runners_for_is_shared.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToCiRunnersForIsShared < ActiveRecord::Migration
+class AddIndexToCiRunnersForIsShared < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170124174637_add_foreign_keys_to_timelogs.rb b/db/migrate/20170124174637_add_foreign_keys_to_timelogs.rb
index a7d4e141a1a..ffd966be086 100644
--- a/db/migrate/20170124174637_add_foreign_keys_to_timelogs.rb
+++ b/db/migrate/20170124174637_add_foreign_keys_to_timelogs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddForeignKeysToTimelogs < ActiveRecord::Migration
+class AddForeignKeysToTimelogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170124193147_add_two_factor_columns_to_namespaces.rb b/db/migrate/20170124193147_add_two_factor_columns_to_namespaces.rb
index 27ebe0af33b..324e051666b 100644
--- a/db/migrate/20170124193147_add_two_factor_columns_to_namespaces.rb
+++ b/db/migrate/20170124193147_add_two_factor_columns_to_namespaces.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddTwoFactorColumnsToNamespaces < ActiveRecord::Migration
+class AddTwoFactorColumnsToNamespaces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170124193205_add_two_factor_columns_to_users.rb b/db/migrate/20170124193205_add_two_factor_columns_to_users.rb
index 558a1837c79..6c80dbfc965 100644
--- a/db/migrate/20170124193205_add_two_factor_columns_to_users.rb
+++ b/db/migrate/20170124193205_add_two_factor_columns_to_users.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddTwoFactorColumnsToUsers < ActiveRecord::Migration
+class AddTwoFactorColumnsToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170126174819_add_terminal_max_session_time_to_application_settings.rb b/db/migrate/20170126174819_add_terminal_max_session_time_to_application_settings.rb
index 334f53f9145..70f1669108a 100644
--- a/db/migrate/20170126174819_add_terminal_max_session_time_to_application_settings.rb
+++ b/db/migrate/20170126174819_add_terminal_max_session_time_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddTerminalMaxSessionTimeToApplicationSettings < ActiveRecord::Migration
+class AddTerminalMaxSessionTimeToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170127032550_remove_backlog_lists_from_boards.rb b/db/migrate/20170127032550_remove_backlog_lists_from_boards.rb
index 0ee4229d1f8..2e2fecfa2a7 100644
--- a/db/migrate/20170127032550_remove_backlog_lists_from_boards.rb
+++ b/db/migrate/20170127032550_remove_backlog_lists_from_boards.rb
@@ -1,4 +1,4 @@
-class RemoveBacklogListsFromBoards < ActiveRecord::Migration
+class RemoveBacklogListsFromBoards < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170130204620_add_index_to_project_authorizations.rb b/db/migrate/20170130204620_add_index_to_project_authorizations.rb
index f256251516a..28c4480e9c6 100644
--- a/db/migrate/20170130204620_add_index_to_project_authorizations.rb
+++ b/db/migrate/20170130204620_add_index_to_project_authorizations.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToProjectAuthorizations < ActiveRecord::Migration
+class AddIndexToProjectAuthorizations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170130221926_create_uploads.rb b/db/migrate/20170130221926_create_uploads.rb
index 6f06c5dd840..7bf15ca4978 100644
--- a/db/migrate/20170130221926_create_uploads.rb
+++ b/db/migrate/20170130221926_create_uploads.rb
@@ -1,4 +1,4 @@
-class CreateUploads < ActiveRecord::Migration
+class CreateUploads < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170131221752_add_relative_position_to_issues.rb b/db/migrate/20170131221752_add_relative_position_to_issues.rb
index fd18d8b6a60..126cb9e5415 100644
--- a/db/migrate/20170131221752_add_relative_position_to_issues.rb
+++ b/db/migrate/20170131221752_add_relative_position_to_issues.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddRelativePositionToIssues < ActiveRecord::Migration
+class AddRelativePositionToIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170204172458_add_name_to_route.rb b/db/migrate/20170204172458_add_name_to_route.rb
index 38ed1ad9039..e7c94aceb26 100644
--- a/db/migrate/20170204172458_add_name_to_route.rb
+++ b/db/migrate/20170204172458_add_name_to_route.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddNameToRoute < ActiveRecord::Migration
+class AddNameToRoute < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb b/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb
index b1b0a601007..746322885b1 100644
--- a/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb
+++ b/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToLabelsForTypeAndProject < ActiveRecord::Migration
+class AddIndexToLabelsForTypeAndProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170206071414_add_recaptcha_verified_to_spam_logs.rb b/db/migrate/20170206071414_add_recaptcha_verified_to_spam_logs.rb
index 44372334d21..06338ac943e 100644
--- a/db/migrate/20170206071414_add_recaptcha_verified_to_spam_logs.rb
+++ b/db/migrate/20170206071414_add_recaptcha_verified_to_spam_logs.rb
@@ -1,4 +1,4 @@
-class AddRecaptchaVerifiedToSpamLogs < ActiveRecord::Migration
+class AddRecaptchaVerifiedToSpamLogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20170206115204_add_column_ghost_to_users.rb b/db/migrate/20170206115204_add_column_ghost_to_users.rb
index cc1eeda1160..4b86814e05d 100644
--- a/db/migrate/20170206115204_add_column_ghost_to_users.rb
+++ b/db/migrate/20170206115204_add_column_ghost_to_users.rb
@@ -1,4 +1,4 @@
-class AddColumnGhostToUsers < ActiveRecord::Migration
+class AddColumnGhostToUsers < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170210062829_add_index_to_labels_for_title_and_project.rb b/db/migrate/20170210062829_add_index_to_labels_for_title_and_project.rb
index 2c20f6a48ab..d0b440b8ccb 100644
--- a/db/migrate/20170210062829_add_index_to_labels_for_title_and_project.rb
+++ b/db/migrate/20170210062829_add_index_to_labels_for_title_and_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToLabelsForTitleAndProject < ActiveRecord::Migration
+class AddIndexToLabelsForTitleAndProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170210075922_add_index_to_ci_trigger_requests_for_commit_id.rb b/db/migrate/20170210075922_add_index_to_ci_trigger_requests_for_commit_id.rb
index c31057f2617..753d6c77e35 100644
--- a/db/migrate/20170210075922_add_index_to_ci_trigger_requests_for_commit_id.rb
+++ b/db/migrate/20170210075922_add_index_to_ci_trigger_requests_for_commit_id.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexToCiTriggerRequestsForCommitId < ActiveRecord::Migration
+class AddIndexToCiTriggerRequestsForCommitId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170210103609_add_index_to_user_agent_detail.rb b/db/migrate/20170210103609_add_index_to_user_agent_detail.rb
index ba4976a5ce8..a2d6528ea82 100644
--- a/db/migrate/20170210103609_add_index_to_user_agent_detail.rb
+++ b/db/migrate/20170210103609_add_index_to_user_agent_detail.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexToUserAgentDetail < ActiveRecord::Migration
+class AddIndexToUserAgentDetail < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170210131347_add_unique_ips_limit_to_application_settings.rb b/db/migrate/20170210131347_add_unique_ips_limit_to_application_settings.rb
index 9ab970134be..c286354f476 100644
--- a/db/migrate/20170210131347_add_unique_ips_limit_to_application_settings.rb
+++ b/db/migrate/20170210131347_add_unique_ips_limit_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddUniqueIpsLimitToApplicationSettings < ActiveRecord::Migration
+class AddUniqueIpsLimitToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
   disable_ddl_transaction!
diff --git a/db/migrate/20170214084746_add_default_artifacts_expiration_to_application_settings.rb b/db/migrate/20170214084746_add_default_artifacts_expiration_to_application_settings.rb
index e0e3ff8957a..84814c2f8f2 100644
--- a/db/migrate/20170214084746_add_default_artifacts_expiration_to_application_settings.rb
+++ b/db/migrate/20170214084746_add_default_artifacts_expiration_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddDefaultArtifactsExpirationToApplicationSettings < ActiveRecord::Migration
+class AddDefaultArtifactsExpirationToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170216135621_add_index_for_latest_successful_pipeline.rb b/db/migrate/20170216135621_add_index_for_latest_successful_pipeline.rb
index 884c4e569d6..be393bd496d 100644
--- a/db/migrate/20170216135621_add_index_for_latest_successful_pipeline.rb
+++ b/db/migrate/20170216135621_add_index_for_latest_successful_pipeline.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class AddIndexForLatestSuccessfulPipeline < ActiveRecord::Migration
+class AddIndexForLatestSuccessfulPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/migrate/20170216141440_drop_index_for_builds_project_status.rb b/db/migrate/20170216141440_drop_index_for_builds_project_status.rb
index 56ad566ca67..7edf7dd7e10 100644
--- a/db/migrate/20170216141440_drop_index_for_builds_project_status.rb
+++ b/db/migrate/20170216141440_drop_index_for_builds_project_status.rb
@@ -1,5 +1,5 @@
 # rubocop:disable RemoveIndex
-class DropIndexForBuildsProjectStatus < ActiveRecord::Migration
+class DropIndexForBuildsProjectStatus < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/migrate/20170217132157_rename_merge_when_build_succeeds.rb b/db/migrate/20170217132157_rename_merge_when_build_succeeds.rb
index 9011526565d..ee8838eff56 100644
--- a/db/migrate/20170217132157_rename_merge_when_build_succeeds.rb
+++ b/db/migrate/20170217132157_rename_merge_when_build_succeeds.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameMergeWhenBuildSucceeds < ActiveRecord::Migration
+class RenameMergeWhenBuildSucceeds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170217151947_rename_only_allow_merge_if_build_succeeds.rb b/db/migrate/20170217151947_rename_only_allow_merge_if_build_succeeds.rb
index b2b68ff72d1..5d35216f3af 100644
--- a/db/migrate/20170217151947_rename_only_allow_merge_if_build_succeeds.rb
+++ b/db/migrate/20170217151947_rename_only_allow_merge_if_build_succeeds.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameOnlyAllowMergeIfBuildSucceeds < ActiveRecord::Migration
+class RenameOnlyAllowMergeIfBuildSucceeds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170217151948_add_owner_id_to_triggers.rb b/db/migrate/20170217151948_add_owner_id_to_triggers.rb
index 16d7cc5bed6..a28711ae59a 100644
--- a/db/migrate/20170217151948_add_owner_id_to_triggers.rb
+++ b/db/migrate/20170217151948_add_owner_id_to_triggers.rb
@@ -1,4 +1,4 @@
-class AddOwnerIdToTriggers < ActiveRecord::Migration
+class AddOwnerIdToTriggers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170217151949_add_description_to_triggers.rb b/db/migrate/20170217151949_add_description_to_triggers.rb
index 1dca0e37412..27cb4b3ab31 100644
--- a/db/migrate/20170217151949_add_description_to_triggers.rb
+++ b/db/migrate/20170217151949_add_description_to_triggers.rb
@@ -1,4 +1,4 @@
-class AddDescriptionToTriggers < ActiveRecord::Migration
+class AddDescriptionToTriggers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170222111732_create_gpg_keys.rb b/db/migrate/20170222111732_create_gpg_keys.rb
index 0d6d454bbf3..012e8ef5854 100644
--- a/db/migrate/20170222111732_create_gpg_keys.rb
+++ b/db/migrate/20170222111732_create_gpg_keys.rb
@@ -1,4 +1,4 @@
-class CreateGpgKeys < ActiveRecord::Migration
+class CreateGpgKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170222143317_drop_ci_projects.rb b/db/migrate/20170222143317_drop_ci_projects.rb
index 4db8658f36f..9f3aa2da382 100644
--- a/db/migrate/20170222143317_drop_ci_projects.rb
+++ b/db/migrate/20170222143317_drop_ci_projects.rb
@@ -1,4 +1,4 @@
-class DropCiProjects < ActiveRecord::Migration
+class DropCiProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170222143500_remove_old_project_id_columns.rb b/db/migrate/20170222143500_remove_old_project_id_columns.rb
index 9bed38a3444..356dee4a060 100644
--- a/db/migrate/20170222143500_remove_old_project_id_columns.rb
+++ b/db/migrate/20170222143500_remove_old_project_id_columns.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/RemoveColumn
 # rubocop:disable RemoveIndex
-class RemoveOldProjectIdColumns < ActiveRecord::Migration
+class RemoveOldProjectIdColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170222143603_rename_gl_project_id_to_project_id.rb b/db/migrate/20170222143603_rename_gl_project_id_to_project_id.rb
index 7c19d471557..390b2c33d91 100644
--- a/db/migrate/20170222143603_rename_gl_project_id_to_project_id.rb
+++ b/db/migrate/20170222143603_rename_gl_project_id_to_project_id.rb
@@ -1,4 +1,4 @@
-class RenameGlProjectIdToProjectId < ActiveRecord::Migration
+class RenameGlProjectIdToProjectId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20170301101006_add_ci_runner_namespaces.rb b/db/migrate/20170301101006_add_ci_runner_namespaces.rb
index deaf03e928b..aa2d8a14242 100644
--- a/db/migrate/20170301101006_add_ci_runner_namespaces.rb
+++ b/db/migrate/20170301101006_add_ci_runner_namespaces.rb
@@ -1,4 +1,4 @@
-class AddCiRunnerNamespaces < ActiveRecord::Migration
+class AddCiRunnerNamespaces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170301125302_add_printing_merge_request_link_enabled_to_project.rb b/db/migrate/20170301125302_add_printing_merge_request_link_enabled_to_project.rb
index 6d43f346d4f..a7efeb8ae6f 100644
--- a/db/migrate/20170301125302_add_printing_merge_request_link_enabled_to_project.rb
+++ b/db/migrate/20170301125302_add_printing_merge_request_link_enabled_to_project.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable Migration/UpdateLargeTable
-class AddPrintingMergeRequestLinkEnabledToProject < ActiveRecord::Migration
+class AddPrintingMergeRequestLinkEnabledToProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170301195939_rename_ci_commits_to_ci_pipelines.rb b/db/migrate/20170301195939_rename_ci_commits_to_ci_pipelines.rb
index 4f061d96392..791e9c845a6 100644
--- a/db/migrate/20170301195939_rename_ci_commits_to_ci_pipelines.rb
+++ b/db/migrate/20170301195939_rename_ci_commits_to_ci_pipelines.rb
@@ -1,4 +1,4 @@
-class RenameCiCommitsToCiPipelines < ActiveRecord::Migration
+class RenameCiCommitsToCiPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20170301205639_remove_unused_ci_tables_and_columns.rb b/db/migrate/20170301205639_remove_unused_ci_tables_and_columns.rb
index ee802ab34ca..08a11aee992 100644
--- a/db/migrate/20170301205639_remove_unused_ci_tables_and_columns.rb
+++ b/db/migrate/20170301205639_remove_unused_ci_tables_and_columns.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/RemoveColumn
-class RemoveUnusedCiTablesAndColumns < ActiveRecord::Migration
+class RemoveUnusedCiTablesAndColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/migrate/20170305180853_add_auto_cancel_pending_pipelines_to_project.rb b/db/migrate/20170305180853_add_auto_cancel_pending_pipelines_to_project.rb
index 3c5cd95726a..3e317bb5248 100644
--- a/db/migrate/20170305180853_add_auto_cancel_pending_pipelines_to_project.rb
+++ b/db/migrate/20170305180853_add_auto_cancel_pending_pipelines_to_project.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddAutoCancelPendingPipelinesToProject < ActiveRecord::Migration
+class AddAutoCancelPendingPipelinesToProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170305203726_add_owner_id_foreign_key.rb b/db/migrate/20170305203726_add_owner_id_foreign_key.rb
index 5fbdc45f1a7..b3bd441ff9c 100644
--- a/db/migrate/20170305203726_add_owner_id_foreign_key.rb
+++ b/db/migrate/20170305203726_add_owner_id_foreign_key.rb
@@ -1,4 +1,4 @@
-class AddOwnerIdForeignKey < ActiveRecord::Migration
+class AddOwnerIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170307125949_add_last_activity_on_to_users.rb b/db/migrate/20170307125949_add_last_activity_on_to_users.rb
index 0100836b473..42331eab753 100644
--- a/db/migrate/20170307125949_add_last_activity_on_to_users.rb
+++ b/db/migrate/20170307125949_add_last_activity_on_to_users.rb
@@ -1,4 +1,4 @@
-class AddLastActivityOnToUsers < ActiveRecord::Migration
+class AddLastActivityOnToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170309173138_create_protected_tags.rb b/db/migrate/20170309173138_create_protected_tags.rb
index 4684c9964c4..f518b500bd4 100644
--- a/db/migrate/20170309173138_create_protected_tags.rb
+++ b/db/migrate/20170309173138_create_protected_tags.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateProtectedTags < ActiveRecord::Migration
+class CreateProtectedTags < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170312114329_add_auto_canceled_by_id_to_pipeline.rb b/db/migrate/20170312114329_add_auto_canceled_by_id_to_pipeline.rb
index 1690ce90564..26187a9e8b3 100644
--- a/db/migrate/20170312114329_add_auto_canceled_by_id_to_pipeline.rb
+++ b/db/migrate/20170312114329_add_auto_canceled_by_id_to_pipeline.rb
@@ -1,4 +1,4 @@
-class AddAutoCanceledByIdToPipeline < ActiveRecord::Migration
+class AddAutoCanceledByIdToPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170312114529_add_auto_canceled_by_id_foreign_key_to_pipeline.rb b/db/migrate/20170312114529_add_auto_canceled_by_id_foreign_key_to_pipeline.rb
index 1e7b02ecf0e..a2b5c1c4533 100644
--- a/db/migrate/20170312114529_add_auto_canceled_by_id_foreign_key_to_pipeline.rb
+++ b/db/migrate/20170312114529_add_auto_canceled_by_id_foreign_key_to_pipeline.rb
@@ -1,4 +1,4 @@
-class AddAutoCanceledByIdForeignKeyToPipeline < ActiveRecord::Migration
+class AddAutoCanceledByIdForeignKeyToPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170313213916_add_index_to_user_ghost.rb b/db/migrate/20170313213916_add_index_to_user_ghost.rb
index fe5847ed225..66e57b444a0 100644
--- a/db/migrate/20170313213916_add_index_to_user_ghost.rb
+++ b/db/migrate/20170313213916_add_index_to_user_ghost.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rubocop:disable RemoveIndex
-class AddIndexToUserGhost < ActiveRecord::Migration
+class AddIndexToUserGhost < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170314082049_create_system_note_metadata.rb b/db/migrate/20170314082049_create_system_note_metadata.rb
index fee47e96053..d0cc6e3be36 100644
--- a/db/migrate/20170314082049_create_system_note_metadata.rb
+++ b/db/migrate/20170314082049_create_system_note_metadata.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateSystemNoteMetadata < ActiveRecord::Migration
+class CreateSystemNoteMetadata < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170315174634_revert_add_notified_of_own_activity_to_users.rb b/db/migrate/20170315174634_revert_add_notified_of_own_activity_to_users.rb
index 9b9098d115d..8773c7ea657 100644
--- a/db/migrate/20170315174634_revert_add_notified_of_own_activity_to_users.rb
+++ b/db/migrate/20170315174634_revert_add_notified_of_own_activity_to_users.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/RemoveColumn
 # rubocop:disable Migration/UpdateLargeTable
-class RevertAddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration
+class RevertAddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170315194013_add_closed_at_to_issues.rb b/db/migrate/20170315194013_add_closed_at_to_issues.rb
index 34a1bd7ca8c..0b06ee6e74c 100644
--- a/db/migrate/20170315194013_add_closed_at_to_issues.rb
+++ b/db/migrate/20170315194013_add_closed_at_to_issues.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddClosedAtToIssues < ActiveRecord::Migration
+class AddClosedAtToIssues < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170316061730_readd_notified_of_own_activity_to_users.rb b/db/migrate/20170316061730_readd_notified_of_own_activity_to_users.rb
index 524eb2557ce..82029dfd3fc 100644
--- a/db/migrate/20170316061730_readd_notified_of_own_activity_to_users.rb
+++ b/db/migrate/20170316061730_readd_notified_of_own_activity_to_users.rb
@@ -1,4 +1,4 @@
-class ReaddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration
+class ReaddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170316163845_move_uploads_to_system_dir.rb b/db/migrate/20170316163845_move_uploads_to_system_dir.rb
index cfcb909ddaf..d24527b55cd 100644
--- a/db/migrate/20170316163845_move_uploads_to_system_dir.rb
+++ b/db/migrate/20170316163845_move_uploads_to_system_dir.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MoveUploadsToSystemDir < ActiveRecord::Migration
+class MoveUploadsToSystemDir < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170317203554_index_routes_path_for_like.rb b/db/migrate/20170317203554_index_routes_path_for_like.rb
index 8d3609135d0..a1bee3c8783 100644
--- a/db/migrate/20170317203554_index_routes_path_for_like.rb
+++ b/db/migrate/20170317203554_index_routes_path_for_like.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IndexRoutesPathForLike < ActiveRecord::Migration
+class IndexRoutesPathForLike < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170320173259_migrate_assignees.rb b/db/migrate/20170320173259_migrate_assignees.rb
index 255b5e9c4db..43a90758bd9 100644
--- a/db/migrate/20170320173259_migrate_assignees.rb
+++ b/db/migrate/20170320173259_migrate_assignees.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class MigrateAssignees < ActiveRecord::Migration
+class MigrateAssignees < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170322013926_create_container_repository.rb b/db/migrate/20170322013926_create_container_repository.rb
index 242f7b8d17d..b1e778671b2 100644
--- a/db/migrate/20170322013926_create_container_repository.rb
+++ b/db/migrate/20170322013926_create_container_repository.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateContainerRepository < ActiveRecord::Migration
+class CreateContainerRepository < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170327091750_add_created_at_index_to_deployments.rb b/db/migrate/20170327091750_add_created_at_index_to_deployments.rb
index fd6ed499b80..f29fff7d5b9 100644
--- a/db/migrate/20170327091750_add_created_at_index_to_deployments.rb
+++ b/db/migrate/20170327091750_add_created_at_index_to_deployments.rb
@@ -1,4 +1,4 @@
-class AddCreatedAtIndexToDeployments < ActiveRecord::Migration
+class AddCreatedAtIndexToDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170328010804_add_uuid_to_application_settings.rb b/db/migrate/20170328010804_add_uuid_to_application_settings.rb
index 5dfcc751c7b..95a01c2dc8f 100644
--- a/db/migrate/20170328010804_add_uuid_to_application_settings.rb
+++ b/db/migrate/20170328010804_add_uuid_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddUuidToApplicationSettings < ActiveRecord::Migration
+class AddUuidToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170329095325_add_ref_to_triggers.rb b/db/migrate/20170329095325_add_ref_to_triggers.rb
index 4aa52dd8f8f..db09b36db17 100644
--- a/db/migrate/20170329095325_add_ref_to_triggers.rb
+++ b/db/migrate/20170329095325_add_ref_to_triggers.rb
@@ -1,4 +1,4 @@
-class AddRefToTriggers < ActiveRecord::Migration
+class AddRefToTriggers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170329095907_create_ci_trigger_schedules.rb b/db/migrate/20170329095907_create_ci_trigger_schedules.rb
index cfcfa27ebb5..7f759f908cd 100644
--- a/db/migrate/20170329095907_create_ci_trigger_schedules.rb
+++ b/db/migrate/20170329095907_create_ci_trigger_schedules.rb
@@ -1,4 +1,4 @@
-class CreateCiTriggerSchedules < ActiveRecord::Migration
+class CreateCiTriggerSchedules < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170329124448_add_polling_interval_multiplier_to_application_settings.rb b/db/migrate/20170329124448_add_polling_interval_multiplier_to_application_settings.rb
index a8affd19a0b..17307879a2a 100644
--- a/db/migrate/20170329124448_add_polling_interval_multiplier_to_application_settings.rb
+++ b/db/migrate/20170329124448_add_polling_interval_multiplier_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPollingIntervalMultiplierToApplicationSettings < ActiveRecord::Migration
+class AddPollingIntervalMultiplierToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170330141723_disable_invalid_service_templates2.rb b/db/migrate/20170330141723_disable_invalid_service_templates2.rb
index 8424e56d8a1..91ec19dfa87 100644
--- a/db/migrate/20170330141723_disable_invalid_service_templates2.rb
+++ b/db/migrate/20170330141723_disable_invalid_service_templates2.rb
@@ -1,7 +1,7 @@
 # This is the same as DisableInvalidServiceTemplates. Later migrations may have
 # inadventently enabled some invalid templates again.
 #
-class DisableInvalidServiceTemplates2 < ActiveRecord::Migration
+class DisableInvalidServiceTemplates2 < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   unless defined?(Service)
diff --git a/db/migrate/20170402231018_remove_index_for_users_current_sign_in_at.rb b/db/migrate/20170402231018_remove_index_for_users_current_sign_in_at.rb
index 42c90103262..4c417ce2f71 100644
--- a/db/migrate/20170402231018_remove_index_for_users_current_sign_in_at.rb
+++ b/db/migrate/20170402231018_remove_index_for_users_current_sign_in_at.rb
@@ -1,6 +1,6 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
-class RemoveIndexForUsersCurrentSignInAt < ActiveRecord::Migration
+class RemoveIndexForUsersCurrentSignInAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170404163427_add_trigger_id_foreign_key.rb b/db/migrate/20170404163427_add_trigger_id_foreign_key.rb
index 6679a95ca11..f35730c8e45 100644
--- a/db/migrate/20170404163427_add_trigger_id_foreign_key.rb
+++ b/db/migrate/20170404163427_add_trigger_id_foreign_key.rb
@@ -1,4 +1,4 @@
-class AddTriggerIdForeignKey < ActiveRecord::Migration
+class AddTriggerIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170405080720_add_import_jid_to_projects.rb b/db/migrate/20170405080720_add_import_jid_to_projects.rb
index 55b87b9d56d..ddbea9d7ab6 100644
--- a/db/migrate/20170405080720_add_import_jid_to_projects.rb
+++ b/db/migrate/20170405080720_add_import_jid_to_projects.rb
@@ -1,4 +1,4 @@
-class AddImportJidToProjects < ActiveRecord::Migration
+class AddImportJidToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170406114958_add_auto_canceled_by_id_to_ci_builds.rb b/db/migrate/20170406114958_add_auto_canceled_by_id_to_ci_builds.rb
index c1d803b4308..ba43a070587 100644
--- a/db/migrate/20170406114958_add_auto_canceled_by_id_to_ci_builds.rb
+++ b/db/migrate/20170406114958_add_auto_canceled_by_id_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddAutoCanceledByIdToCiBuilds < ActiveRecord::Migration
+class AddAutoCanceledByIdToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170406115029_add_auto_canceled_by_id_foreign_key_to_ci_builds.rb b/db/migrate/20170406115029_add_auto_canceled_by_id_foreign_key_to_ci_builds.rb
index 3004683933b..2ec281e20c1 100644
--- a/db/migrate/20170406115029_add_auto_canceled_by_id_foreign_key_to_ci_builds.rb
+++ b/db/migrate/20170406115029_add_auto_canceled_by_id_foreign_key_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddAutoCanceledByIdForeignKeyToCiBuilds < ActiveRecord::Migration
+class AddAutoCanceledByIdForeignKeyToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170407114956_add_ref_to_ci_trigger_schedule.rb b/db/migrate/20170407114956_add_ref_to_ci_trigger_schedule.rb
index 523a306f127..5d156b7ef2e 100644
--- a/db/migrate/20170407114956_add_ref_to_ci_trigger_schedule.rb
+++ b/db/migrate/20170407114956_add_ref_to_ci_trigger_schedule.rb
@@ -1,4 +1,4 @@
-class AddRefToCiTriggerSchedule < ActiveRecord::Migration
+class AddRefToCiTriggerSchedule < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170407122426_add_active_to_ci_trigger_schedule.rb b/db/migrate/20170407122426_add_active_to_ci_trigger_schedule.rb
index 36892118ac0..33295bd3f2e 100644
--- a/db/migrate/20170407122426_add_active_to_ci_trigger_schedule.rb
+++ b/db/migrate/20170407122426_add_active_to_ci_trigger_schedule.rb
@@ -1,4 +1,4 @@
-class AddActiveToCiTriggerSchedule < ActiveRecord::Migration
+class AddActiveToCiTriggerSchedule < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170407135259_add_foreigh_key_trigger_requests_trigger.rb b/db/migrate/20170407135259_add_foreigh_key_trigger_requests_trigger.rb
index 81761c65a9f..9aaa4d0eddf 100644
--- a/db/migrate/20170407135259_add_foreigh_key_trigger_requests_trigger.rb
+++ b/db/migrate/20170407135259_add_foreigh_key_trigger_requests_trigger.rb
@@ -1,4 +1,4 @@
-class AddForeighKeyTriggerRequestsTrigger < ActiveRecord::Migration
+class AddForeighKeyTriggerRequestsTrigger < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170407140450_add_index_to_next_run_at_and_active.rb b/db/migrate/20170407140450_add_index_to_next_run_at_and_active.rb
index 626c2a67fdc..0bde4f69b3b 100644
--- a/db/migrate/20170407140450_add_index_to_next_run_at_and_active.rb
+++ b/db/migrate/20170407140450_add_index_to_next_run_at_and_active.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexToNextRunAtAndActive < ActiveRecord::Migration
+class AddIndexToNextRunAtAndActive < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170410133135_add_version_field_to_markdown_cache.rb b/db/migrate/20170410133135_add_version_field_to_markdown_cache.rb
index d9209fe5770..c019e0627d3 100644
--- a/db/migrate/20170410133135_add_version_field_to_markdown_cache.rb
+++ b/db/migrate/20170410133135_add_version_field_to_markdown_cache.rb
@@ -1,4 +1,4 @@
-class AddVersionFieldToMarkdownCache < ActiveRecord::Migration
+class AddVersionFieldToMarkdownCache < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170413035209_add_preferred_language_to_users.rb b/db/migrate/20170413035209_add_preferred_language_to_users.rb
index 92f1d6f2436..5b5f00ea60f 100644
--- a/db/migrate/20170413035209_add_preferred_language_to_users.rb
+++ b/db/migrate/20170413035209_add_preferred_language_to_users.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPreferredLanguageToUsers < ActiveRecord::Migration
+class AddPreferredLanguageToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170418103908_delete_orphan_notification_settings.rb b/db/migrate/20170418103908_delete_orphan_notification_settings.rb
index e4b9cf65936..c99729b9127 100644
--- a/db/migrate/20170418103908_delete_orphan_notification_settings.rb
+++ b/db/migrate/20170418103908_delete_orphan_notification_settings.rb
@@ -1,4 +1,4 @@
-class DeleteOrphanNotificationSettings < ActiveRecord::Migration
+class DeleteOrphanNotificationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170419001229_add_index_to_system_note_metadata.rb b/db/migrate/20170419001229_add_index_to_system_note_metadata.rb
index c68fd920fff..59cd55395fc 100644
--- a/db/migrate/20170419001229_add_index_to_system_note_metadata.rb
+++ b/db/migrate/20170419001229_add_index_to_system_note_metadata.rb
@@ -1,4 +1,4 @@
-class AddIndexToSystemNoteMetadata < ActiveRecord::Migration
+class AddIndexToSystemNoteMetadata < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170421102337_remove_nil_type_services.rb b/db/migrate/20170421102337_remove_nil_type_services.rb
index b835b9c6ed9..561eddf69e0 100644
--- a/db/migrate/20170421102337_remove_nil_type_services.rb
+++ b/db/migrate/20170421102337_remove_nil_type_services.rb
@@ -1,4 +1,4 @@
-class RemoveNilTypeServices < ActiveRecord::Migration
+class RemoveNilTypeServices < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170423064036_add_index_on_ci_builds_updated_at.rb b/db/migrate/20170423064036_add_index_on_ci_builds_updated_at.rb
index 0bbb74ee05e..76252378c2e 100644
--- a/db/migrate/20170423064036_add_index_on_ci_builds_updated_at.rb
+++ b/db/migrate/20170423064036_add_index_on_ci_builds_updated_at.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexOnCiBuildsUpdatedAt < ActiveRecord::Migration
+class AddIndexOnCiBuildsUpdatedAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170424095707_add_index_on_ci_builds_user_id.rb b/db/migrate/20170424095707_add_index_on_ci_builds_user_id.rb
index 348d5dbc270..ab2501da941 100644
--- a/db/migrate/20170424095707_add_index_on_ci_builds_user_id.rb
+++ b/db/migrate/20170424095707_add_index_on_ci_builds_user_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexOnCiBuildsUserId < ActiveRecord::Migration
+class AddIndexOnCiBuildsUserId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170424142900_add_index_to_web_hooks_type.rb b/db/migrate/20170424142900_add_index_to_web_hooks_type.rb
index 9af158e3844..1c56c1ed65a 100644
--- a/db/migrate/20170424142900_add_index_to_web_hooks_type.rb
+++ b/db/migrate/20170424142900_add_index_to_web_hooks_type.rb
@@ -1,4 +1,4 @@
-class AddIndexToWebHooksType < ActiveRecord::Migration
+class AddIndexToWebHooksType < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170425112128_create_pipeline_schedules_table.rb b/db/migrate/20170425112128_create_pipeline_schedules_table.rb
index bd15b9eef19..e66e81b34be 100644
--- a/db/migrate/20170425112128_create_pipeline_schedules_table.rb
+++ b/db/migrate/20170425112128_create_pipeline_schedules_table.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreatePipelineSchedulesTable < ActiveRecord::Migration
+class CreatePipelineSchedulesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170425112628_remove_foreigh_key_ci_trigger_schedules.rb b/db/migrate/20170425112628_remove_foreigh_key_ci_trigger_schedules.rb
index 1587eee06ae..d89c4c61cbe 100644
--- a/db/migrate/20170425112628_remove_foreigh_key_ci_trigger_schedules.rb
+++ b/db/migrate/20170425112628_remove_foreigh_key_ci_trigger_schedules.rb
@@ -1,4 +1,4 @@
-class RemoveForeighKeyCiTriggerSchedules < ActiveRecord::Migration
+class RemoveForeighKeyCiTriggerSchedules < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170425114731_add_pipeline_schedule_id_to_pipelines.rb b/db/migrate/20170425114731_add_pipeline_schedule_id_to_pipelines.rb
index ddb27d4dc81..da16d89febc 100644
--- a/db/migrate/20170425114731_add_pipeline_schedule_id_to_pipelines.rb
+++ b/db/migrate/20170425114731_add_pipeline_schedule_id_to_pipelines.rb
@@ -1,4 +1,4 @@
-class AddPipelineScheduleIdToPipelines < ActiveRecord::Migration
+class AddPipelineScheduleIdToPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170426175636_fill_missing_uuid_on_application_settings.rb b/db/migrate/20170426175636_fill_missing_uuid_on_application_settings.rb
index 58ad2c64075..eeeb216f32c 100644
--- a/db/migrate/20170426175636_fill_missing_uuid_on_application_settings.rb
+++ b/db/migrate/20170426175636_fill_missing_uuid_on_application_settings.rb
@@ -1,4 +1,4 @@
-class FillMissingUuidOnApplicationSettings < ActiveRecord::Migration
+class FillMissingUuidOnApplicationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170426181740_add_index_on_ci_runners_contacted_at.rb b/db/migrate/20170426181740_add_index_on_ci_runners_contacted_at.rb
index 879825a1934..e14b2eb4c8a 100644
--- a/db/migrate/20170426181740_add_index_on_ci_runners_contacted_at.rb
+++ b/db/migrate/20170426181740_add_index_on_ci_runners_contacted_at.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexOnCiRunnersContactedAt < ActiveRecord::Migration
+class AddIndexOnCiRunnersContactedAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170427103502_create_web_hook_logs.rb b/db/migrate/20170427103502_create_web_hook_logs.rb
index 3643c52180c..a7a061e7bae 100644
--- a/db/migrate/20170427103502_create_web_hook_logs.rb
+++ b/db/migrate/20170427103502_create_web_hook_logs.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class CreateWebHookLogs < ActiveRecord::Migration
+class CreateWebHookLogs < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170427215854_create_redirect_routes.rb b/db/migrate/20170427215854_create_redirect_routes.rb
index 6db508e5db4..069c9b39d37 100644
--- a/db/migrate/20170427215854_create_redirect_routes.rb
+++ b/db/migrate/20170427215854_create_redirect_routes.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateRedirectRoutes < ActiveRecord::Migration
+class CreateRedirectRoutes < ActiveRecord::Migration[4.2]
   # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
diff --git a/db/migrate/20170428064307_add_column_delete_error_to_projects.rb b/db/migrate/20170428064307_add_column_delete_error_to_projects.rb
index 09f9d9b5b7a..bef0373309c 100644
--- a/db/migrate/20170428064307_add_column_delete_error_to_projects.rb
+++ b/db/migrate/20170428064307_add_column_delete_error_to_projects.rb
@@ -1,4 +1,4 @@
-class AddColumnDeleteErrorToProjects < ActiveRecord::Migration
+class AddColumnDeleteErrorToProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170502065653_make_auto_cancel_pending_pipelines_on_by_default.rb b/db/migrate/20170502065653_make_auto_cancel_pending_pipelines_on_by_default.rb
index 03bf626a08a..e51a790de4d 100644
--- a/db/migrate/20170502065653_make_auto_cancel_pending_pipelines_on_by_default.rb
+++ b/db/migrate/20170502065653_make_auto_cancel_pending_pipelines_on_by_default.rb
@@ -1,4 +1,4 @@
-class MakeAutoCancelPendingPipelinesOnByDefault < ActiveRecord::Migration
+class MakeAutoCancelPendingPipelinesOnByDefault < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170502135553_create_index_ci_pipelines_auto_canceled_by_id.rb b/db/migrate/20170502135553_create_index_ci_pipelines_auto_canceled_by_id.rb
index b64d7e0e3f6..7acae645c7b 100644
--- a/db/migrate/20170502135553_create_index_ci_pipelines_auto_canceled_by_id.rb
+++ b/db/migrate/20170502135553_create_index_ci_pipelines_auto_canceled_by_id.rb
@@ -1,4 +1,4 @@
-class CreateIndexCiPipelinesAutoCanceledById < ActiveRecord::Migration
+class CreateIndexCiPipelinesAutoCanceledById < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170502140503_create_index_ci_builds_auto_canceled_by_id.rb b/db/migrate/20170502140503_create_index_ci_builds_auto_canceled_by_id.rb
index 0a8d2c8ff61..f5148f6fdb8 100644
--- a/db/migrate/20170502140503_create_index_ci_builds_auto_canceled_by_id.rb
+++ b/db/migrate/20170502140503_create_index_ci_builds_auto_canceled_by_id.rb
@@ -1,4 +1,4 @@
-class CreateIndexCiBuildsAutoCanceledById < ActiveRecord::Migration
+class CreateIndexCiBuildsAutoCanceledById < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503004125_add_last_repository_updated_at_to_projects.rb b/db/migrate/20170503004125_add_last_repository_updated_at_to_projects.rb
index 2ea49f62742..303250ff3b0 100644
--- a/db/migrate/20170503004125_add_last_repository_updated_at_to_projects.rb
+++ b/db/migrate/20170503004125_add_last_repository_updated_at_to_projects.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Datetime
-class AddLastRepositoryUpdatedAtToProjects < ActiveRecord::Migration
+class AddLastRepositoryUpdatedAtToProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170503004425_add_index_to_last_repository_updated_at_on_projects.rb b/db/migrate/20170503004425_add_index_to_last_repository_updated_at_on_projects.rb
index 6144d74745c..ae54cfb39f5 100644
--- a/db/migrate/20170503004425_add_index_to_last_repository_updated_at_on_projects.rb
+++ b/db/migrate/20170503004425_add_index_to_last_repository_updated_at_on_projects.rb
@@ -1,4 +1,4 @@
-class AddIndexToLastRepositoryUpdatedAtOnProjects < ActiveRecord::Migration
+class AddIndexToLastRepositoryUpdatedAtOnProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503004426_add_retried_to_ci_build.rb b/db/migrate/20170503004426_add_retried_to_ci_build.rb
index 2851e3de473..ff2e0ba64c5 100644
--- a/db/migrate/20170503004426_add_retried_to_ci_build.rb
+++ b/db/migrate/20170503004426_add_retried_to_ci_build.rb
@@ -1,4 +1,4 @@
-class AddRetriedToCiBuild < ActiveRecord::Migration
+class AddRetriedToCiBuild < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb b/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb
index a5d1eca82bb..ef527bb8007 100644
--- a/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb
+++ b/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLastEditedAtAndLastEditedByIdToIssues < ActiveRecord::Migration
+class AddLastEditedAtAndLastEditedByIdToIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb b/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb
index 47ba6bde856..19b8a9d66e7 100644
--- a/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb
+++ b/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLastEditedAtAndLastEditedByIdToMergeRequests < ActiveRecord::Migration
+class AddLastEditedAtAndLastEditedByIdToMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170503023315_add_repository_update_events_to_web_hooks.rb b/db/migrate/20170503023315_add_repository_update_events_to_web_hooks.rb
index 0faea87a962..4824c404ec7 100644
--- a/db/migrate/20170503023315_add_repository_update_events_to_web_hooks.rb
+++ b/db/migrate/20170503023315_add_repository_update_events_to_web_hooks.rb
@@ -1,4 +1,4 @@
-class AddRepositoryUpdateEventsToWebHooks < ActiveRecord::Migration
+class AddRepositoryUpdateEventsToWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503114228_add_description_to_snippets.rb b/db/migrate/20170503114228_add_description_to_snippets.rb
index 3fc960b2da5..78151ed9ff6 100644
--- a/db/migrate/20170503114228_add_description_to_snippets.rb
+++ b/db/migrate/20170503114228_add_description_to_snippets.rb
@@ -1,4 +1,4 @@
-class AddDescriptionToSnippets < ActiveRecord::Migration
+class AddDescriptionToSnippets < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503140201_reschedule_project_authorizations.rb b/db/migrate/20170503140201_reschedule_project_authorizations.rb
index fa45adadbae..aa940bed2d3 100644
--- a/db/migrate/20170503140201_reschedule_project_authorizations.rb
+++ b/db/migrate/20170503140201_reschedule_project_authorizations.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RescheduleProjectAuthorizations < ActiveRecord::Migration
+class RescheduleProjectAuthorizations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170503140202_turn_nested_groups_into_regular_groups_for_mysql.rb b/db/migrate/20170503140202_turn_nested_groups_into_regular_groups_for_mysql.rb
index 33908ae1156..cfa63b65df4 100644
--- a/db/migrate/20170503140202_turn_nested_groups_into_regular_groups_for_mysql.rb
+++ b/db/migrate/20170503140202_turn_nested_groups_into_regular_groups_for_mysql.rb
@@ -5,7 +5,7 @@
 # updating a namespace to also rename directories (uploads, GitLab pages, etc).
 # The alternative is to copy hundreds of lines of code into this migration,
 # adjust them where needed, etc; something which doesn't work well at all.
-class TurnNestedGroupsIntoRegularGroupsForMysql < ActiveRecord::Migration
+class TurnNestedGroupsIntoRegularGroupsForMysql < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170503184421_add_index_to_redirect_routes.rb b/db/migrate/20170503184421_add_index_to_redirect_routes.rb
index 9062cf19a73..6320d4bbc99 100644
--- a/db/migrate/20170503184421_add_index_to_redirect_routes.rb
+++ b/db/migrate/20170503184421_add_index_to_redirect_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexToRedirectRoutes < ActiveRecord::Migration
+class AddIndexToRedirectRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb b/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb
index 8eb20faa03a..5d06fd0511c 100644
--- a/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb
+++ b/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IndexRedirectRoutesPathForLike < ActiveRecord::Migration
+class IndexRedirectRoutesPathForLike < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
index 141112f8b50..4659f694020 100644
--- a/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
+++ b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddClientsideSentryToApplicationSettings < ActiveRecord::Migration
+class AddClientsideSentryToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170504182103_add_index_project_group_links_group_id.rb b/db/migrate/20170504182103_add_index_project_group_links_group_id.rb
index 62bf641daa6..5b1c14e66dd 100644
--- a/db/migrate/20170504182103_add_index_project_group_links_group_id.rb
+++ b/db/migrate/20170504182103_add_index_project_group_links_group_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexProjectGroupLinksGroupId < ActiveRecord::Migration
+class AddIndexProjectGroupLinksGroupId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170506085040_add_index_to_pipeline_pipeline_schedule_id.rb b/db/migrate/20170506085040_add_index_to_pipeline_pipeline_schedule_id.rb
index 08a7f3fc9ab..9d8cc8a83a2 100644
--- a/db/migrate/20170506085040_add_index_to_pipeline_pipeline_schedule_id.rb
+++ b/db/migrate/20170506085040_add_index_to_pipeline_pipeline_schedule_id.rb
@@ -1,4 +1,4 @@
-class AddIndexToPipelinePipelineScheduleId < ActiveRecord::Migration
+class AddIndexToPipelinePipelineScheduleId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170506091344_add_foreign_key_to_pipeline_schedules.rb b/db/migrate/20170506091344_add_foreign_key_to_pipeline_schedules.rb
index 7f2dba702af..244e41e2f07 100644
--- a/db/migrate/20170506091344_add_foreign_key_to_pipeline_schedules.rb
+++ b/db/migrate/20170506091344_add_foreign_key_to_pipeline_schedules.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToPipelineSchedules < ActiveRecord::Migration
+class AddForeignKeyToPipelineSchedules < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170506185517_add_foreign_key_pipeline_schedules_and_pipelines.rb b/db/migrate/20170506185517_add_foreign_key_pipeline_schedules_and_pipelines.rb
index cc5cb355579..50364cac259 100644
--- a/db/migrate/20170506185517_add_foreign_key_pipeline_schedules_and_pipelines.rb
+++ b/db/migrate/20170506185517_add_foreign_key_pipeline_schedules_and_pipelines.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyPipelineSchedulesAndPipelines < ActiveRecord::Migration
+class AddForeignKeyPipelineSchedulesAndPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170507205316_add_head_pipeline_id_to_merge_requests.rb b/db/migrate/20170507205316_add_head_pipeline_id_to_merge_requests.rb
index 8fc6e380a77..adfe6559084 100644
--- a/db/migrate/20170507205316_add_head_pipeline_id_to_merge_requests.rb
+++ b/db/migrate/20170507205316_add_head_pipeline_id_to_merge_requests.rb
@@ -1,4 +1,4 @@
-class AddHeadPipelineIdToMergeRequests < ActiveRecord::Migration
+class AddHeadPipelineIdToMergeRequests < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170508153950_add_not_null_contraints_to_ci_variables.rb b/db/migrate/20170508153950_add_not_null_contraints_to_ci_variables.rb
index 41c687a4f6e..2a0c7132bfd 100644
--- a/db/migrate/20170508153950_add_not_null_contraints_to_ci_variables.rb
+++ b/db/migrate/20170508153950_add_not_null_contraints_to_ci_variables.rb
@@ -1,4 +1,4 @@
-class AddNotNullContraintsToCiVariables < ActiveRecord::Migration
+class AddNotNullContraintsToCiVariables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb b/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb
index 20ecaa2c36c..305366b2171 100644
--- a/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb
+++ b/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToCiVariables < ActiveRecord::Migration
+class AddForeignKeyToCiVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170511082759_rename_web_hooks_build_events_to_job_events.rb b/db/migrate/20170511082759_rename_web_hooks_build_events_to_job_events.rb
index a2320a911b7..3a44057d948 100644
--- a/db/migrate/20170511082759_rename_web_hooks_build_events_to_job_events.rb
+++ b/db/migrate/20170511082759_rename_web_hooks_build_events_to_job_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameWebHooksBuildEventsToJobEvents < ActiveRecord::Migration
+class RenameWebHooksBuildEventsToJobEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170511083824_rename_services_build_events_to_job_events.rb b/db/migrate/20170511083824_rename_services_build_events_to_job_events.rb
index 303d47078e7..713adde76ef 100644
--- a/db/migrate/20170511083824_rename_services_build_events_to_job_events.rb
+++ b/db/migrate/20170511083824_rename_services_build_events_to_job_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameServicesBuildEventsToJobEvents < ActiveRecord::Migration
+class RenameServicesBuildEventsToJobEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170516153305_migrate_assignee_to_separate_table.rb b/db/migrate/20170516153305_migrate_assignee_to_separate_table.rb
index eed9f00d8b2..0ed45775421 100644
--- a/db/migrate/20170516153305_migrate_assignee_to_separate_table.rb
+++ b/db/migrate/20170516153305_migrate_assignee_to_separate_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateAssigneeToSeparateTable < ActiveRecord::Migration
+class MigrateAssigneeToSeparateTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170516183131_add_indices_to_issue_assignees.rb b/db/migrate/20170516183131_add_indices_to_issue_assignees.rb
index a1f064c6848..6877fe9ff98 100644
--- a/db/migrate/20170516183131_add_indices_to_issue_assignees.rb
+++ b/db/migrate/20170516183131_add_indices_to_issue_assignees.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndicesToIssueAssignees < ActiveRecord::Migration
+class AddIndicesToIssueAssignees < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170519102115_add_prometheus_settings_to_metrics_settings.rb b/db/migrate/20170519102115_add_prometheus_settings_to_metrics_settings.rb
index 6ec2ed712b9..9c8f58104bd 100644
--- a/db/migrate/20170519102115_add_prometheus_settings_to_metrics_settings.rb
+++ b/db/migrate/20170519102115_add_prometheus_settings_to_metrics_settings.rb
@@ -1,4 +1,4 @@
-class AddPrometheusSettingsToMetricsSettings < ActiveRecord::Migration
+class AddPrometheusSettingsToMetricsSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20170521184006_add_change_position_to_notes.rb b/db/migrate/20170521184006_add_change_position_to_notes.rb
index 219ed1ade4c..f0ca3a2a9ea 100644
--- a/db/migrate/20170521184006_add_change_position_to_notes.rb
+++ b/db/migrate/20170521184006_add_change_position_to_notes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddChangePositionToNotes < ActiveRecord::Migration
+class AddChangePositionToNotes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170523091700_add_rss_token_to_users.rb b/db/migrate/20170523091700_add_rss_token_to_users.rb
index 06a85f6ac3d..e1bcd9b3fee 100644
--- a/db/migrate/20170523091700_add_rss_token_to_users.rb
+++ b/db/migrate/20170523091700_add_rss_token_to_users.rb
@@ -1,4 +1,4 @@
-class AddRssTokenToUsers < ActiveRecord::Migration
+class AddRssTokenToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170523121229_create_conversational_development_index_metrics.rb b/db/migrate/20170523121229_create_conversational_development_index_metrics.rb
index 7026a867ae1..5f8c0d07e3c 100644
--- a/db/migrate/20170523121229_create_conversational_development_index_metrics.rb
+++ b/db/migrate/20170523121229_create_conversational_development_index_metrics.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreateConversationalDevelopmentIndexMetrics < ActiveRecord::Migration
+class CreateConversationalDevelopmentIndexMetrics < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170524125940_add_source_to_ci_pipeline.rb b/db/migrate/20170524125940_add_source_to_ci_pipeline.rb
index 1fa3d48037b..81358e7ce3d 100644
--- a/db/migrate/20170524125940_add_source_to_ci_pipeline.rb
+++ b/db/migrate/20170524125940_add_source_to_ci_pipeline.rb
@@ -1,4 +1,4 @@
-class AddSourceToCiPipeline < ActiveRecord::Migration
+class AddSourceToCiPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170524161101_add_protected_to_ci_variables.rb b/db/migrate/20170524161101_add_protected_to_ci_variables.rb
index 99d4861e889..6125ea5d5a8 100644
--- a/db/migrate/20170524161101_add_protected_to_ci_variables.rb
+++ b/db/migrate/20170524161101_add_protected_to_ci_variables.rb
@@ -1,4 +1,4 @@
-class AddProtectedToCiVariables < ActiveRecord::Migration
+class AddProtectedToCiVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170525130346_create_group_variables_table.rb b/db/migrate/20170525130346_create_group_variables_table.rb
index eaa38dbc40d..6eae7eff7bd 100644
--- a/db/migrate/20170525130346_create_group_variables_table.rb
+++ b/db/migrate/20170525130346_create_group_variables_table.rb
@@ -1,4 +1,4 @@
-class CreateGroupVariablesTable < ActiveRecord::Migration
+class CreateGroupVariablesTable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170525130758_add_foreign_key_to_group_variables.rb b/db/migrate/20170525130758_add_foreign_key_to_group_variables.rb
index 0146235c5ba..f1f51a1dda3 100644
--- a/db/migrate/20170525130758_add_foreign_key_to_group_variables.rb
+++ b/db/migrate/20170525130758_add_foreign_key_to_group_variables.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToGroupVariables < ActiveRecord::Migration
+class AddForeignKeyToGroupVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170525132202_create_pipeline_stages.rb b/db/migrate/20170525132202_create_pipeline_stages.rb
index 825993aa41e..0a6400fde90 100644
--- a/db/migrate/20170525132202_create_pipeline_stages.rb
+++ b/db/migrate/20170525132202_create_pipeline_stages.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/Timestamps
-class CreatePipelineStages < ActiveRecord::Migration
+class CreatePipelineStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170525174156_create_feature_tables.rb b/db/migrate/20170525174156_create_feature_tables.rb
index a083c89c85f..e1eaaff8d35 100644
--- a/db/migrate/20170525174156_create_feature_tables.rb
+++ b/db/migrate/20170525174156_create_feature_tables.rb
@@ -1,4 +1,4 @@
-class CreateFeatureTables < ActiveRecord::Migration
+class CreateFeatureTables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170526185602_add_stage_id_to_ci_builds.rb b/db/migrate/20170526185602_add_stage_id_to_ci_builds.rb
index d27cba76d81..6958557d118 100644
--- a/db/migrate/20170526185602_add_stage_id_to_ci_builds.rb
+++ b/db/migrate/20170526185602_add_stage_id_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddStageIdToCiBuilds < ActiveRecord::Migration
+class AddStageIdToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170530130129_project_foreign_keys_with_cascading_deletes.rb b/db/migrate/20170530130129_project_foreign_keys_with_cascading_deletes.rb
index 12352d98a62..d40c61f24b1 100644
--- a/db/migrate/20170530130129_project_foreign_keys_with_cascading_deletes.rb
+++ b/db/migrate/20170530130129_project_foreign_keys_with_cascading_deletes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ProjectForeignKeysWithCascadingDeletes < ActiveRecord::Migration
+class ProjectForeignKeysWithCascadingDeletes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170531180233_add_authorized_keys_enabled_to_application_settings.rb b/db/migrate/20170531180233_add_authorized_keys_enabled_to_application_settings.rb
index 1d86a531eb3..f440609ff8a 100644
--- a/db/migrate/20170531180233_add_authorized_keys_enabled_to_application_settings.rb
+++ b/db/migrate/20170531180233_add_authorized_keys_enabled_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddAuthorizedKeysEnabledToApplicationSettings < ActiveRecord::Migration
+class AddAuthorizedKeysEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170531202042_rename_users_ldap_email_to_external_email.rb b/db/migrate/20170531202042_rename_users_ldap_email_to_external_email.rb
index f858611d24b..7b1a7644555 100644
--- a/db/migrate/20170531202042_rename_users_ldap_email_to_external_email.rb
+++ b/db/migrate/20170531202042_rename_users_ldap_email_to_external_email.rb
@@ -1,4 +1,4 @@
-class RenameUsersLdapEmailToExternalEmail < ActiveRecord::Migration
+class RenameUsersLdapEmailToExternalEmail < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170601163708_add_artifacts_store_to_ci_build.rb b/db/migrate/20170601163708_add_artifacts_store_to_ci_build.rb
index e82109190a7..4c9ac821b20 100644
--- a/db/migrate/20170601163708_add_artifacts_store_to_ci_build.rb
+++ b/db/migrate/20170601163708_add_artifacts_store_to_ci_build.rb
@@ -1,4 +1,4 @@
-class AddArtifactsStoreToCiBuild < ActiveRecord::Migration
+class AddArtifactsStoreToCiBuild < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170602154736_add_help_page_hide_commercial_content_to_application_settings.rb b/db/migrate/20170602154736_add_help_page_hide_commercial_content_to_application_settings.rb
index d358020d182..ff9e188d7a8 100644
--- a/db/migrate/20170602154736_add_help_page_hide_commercial_content_to_application_settings.rb
+++ b/db/migrate/20170602154736_add_help_page_hide_commercial_content_to_application_settings.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/SaferBooleanColumn
-class AddHelpPageHideCommercialContentToApplicationSettings < ActiveRecord::Migration
+class AddHelpPageHideCommercialContentToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170602154813_add_help_page_support_url_to_application_settings.rb b/db/migrate/20170602154813_add_help_page_support_url_to_application_settings.rb
index 138fe9b2a37..388e130ab88 100644
--- a/db/migrate/20170602154813_add_help_page_support_url_to_application_settings.rb
+++ b/db/migrate/20170602154813_add_help_page_support_url_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddHelpPageSupportUrlToApplicationSettings < ActiveRecord::Migration
+class AddHelpPageSupportUrlToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170603200744_add_email_provider_to_users.rb b/db/migrate/20170603200744_add_email_provider_to_users.rb
index ed90af9aadc..ad6e813d31b 100644
--- a/db/migrate/20170603200744_add_email_provider_to_users.rb
+++ b/db/migrate/20170603200744_add_email_provider_to_users.rb
@@ -1,4 +1,4 @@
-class AddEmailProviderToUsers < ActiveRecord::Migration
+class AddEmailProviderToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170606154216_add_notification_setting_columns.rb b/db/migrate/20170606154216_add_notification_setting_columns.rb
index 0a9b5da6583..3b9493e6b49 100644
--- a/db/migrate/20170606154216_add_notification_setting_columns.rb
+++ b/db/migrate/20170606154216_add_notification_setting_columns.rb
@@ -1,4 +1,4 @@
-class AddNotificationSettingColumns < ActiveRecord::Migration
+class AddNotificationSettingColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170608152747_prepare_events_table_for_push_events_migration.rb b/db/migrate/20170608152747_prepare_events_table_for_push_events_migration.rb
index f4f03bbabaf..851af7f7bf6 100644
--- a/db/migrate/20170608152747_prepare_events_table_for_push_events_migration.rb
+++ b/db/migrate/20170608152747_prepare_events_table_for_push_events_migration.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PrepareEventsTableForPushEventsMigration < ActiveRecord::Migration
+class PrepareEventsTableForPushEventsMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170608152748_create_push_event_payloads_tables.rb b/db/migrate/20170608152748_create_push_event_payloads_tables.rb
index 6c55ad1f2f7..292d9e3ca06 100644
--- a/db/migrate/20170608152748_create_push_event_payloads_tables.rb
+++ b/db/migrate/20170608152748_create_push_event_payloads_tables.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CreatePushEventPayloadsTables < ActiveRecord::Migration
+class CreatePushEventPayloadsTables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170608171156_create_merge_request_diff_files.rb b/db/migrate/20170608171156_create_merge_request_diff_files.rb
index bf0c0d29adc..94b518455ee 100644
--- a/db/migrate/20170608171156_create_merge_request_diff_files.rb
+++ b/db/migrate/20170608171156_create_merge_request_diff_files.rb
@@ -1,4 +1,4 @@
-class CreateMergeRequestDiffFiles < ActiveRecord::Migration
+class CreateMergeRequestDiffFiles < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   disable_ddl_transaction!
diff --git a/db/migrate/20170613154149_create_gpg_signatures.rb b/db/migrate/20170613154149_create_gpg_signatures.rb
index abef13a7a0b..181d35fe7af 100644
--- a/db/migrate/20170613154149_create_gpg_signatures.rb
+++ b/db/migrate/20170613154149_create_gpg_signatures.rb
@@ -1,4 +1,4 @@
-class CreateGpgSignatures < ActiveRecord::Migration
+class CreateGpgSignatures < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170616133147_create_merge_request_diff_commits.rb b/db/migrate/20170616133147_create_merge_request_diff_commits.rb
index 616464cb470..5e148affba2 100644
--- a/db/migrate/20170616133147_create_merge_request_diff_commits.rb
+++ b/db/migrate/20170616133147_create_merge_request_diff_commits.rb
@@ -1,4 +1,4 @@
-class CreateMergeRequestDiffCommits < ActiveRecord::Migration
+class CreateMergeRequestDiffCommits < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170619144837_add_index_for_head_pipeline_merge_request.rb b/db/migrate/20170619144837_add_index_for_head_pipeline_merge_request.rb
index 02863bee082..f97c8a14b8d 100644
--- a/db/migrate/20170619144837_add_index_for_head_pipeline_merge_request.rb
+++ b/db/migrate/20170619144837_add_index_for_head_pipeline_merge_request.rb
@@ -1,4 +1,4 @@
-class AddIndexForHeadPipelineMergeRequest < ActiveRecord::Migration
+class AddIndexForHeadPipelineMergeRequest < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170620064728_create_ci_pipeline_schedule_variables.rb b/db/migrate/20170620064728_create_ci_pipeline_schedule_variables.rb
index 92833765a82..74f3603505b 100644
--- a/db/migrate/20170620064728_create_ci_pipeline_schedule_variables.rb
+++ b/db/migrate/20170620064728_create_ci_pipeline_schedule_variables.rb
@@ -1,4 +1,4 @@
-class CreateCiPipelineScheduleVariables < ActiveRecord::Migration
+class CreateCiPipelineScheduleVariables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170620065449_add_foreign_key_to_ci_pipeline_schedule_variables.rb b/db/migrate/20170620065449_add_foreign_key_to_ci_pipeline_schedule_variables.rb
index 7bbf66e0ac3..f6de19aeaf2 100644
--- a/db/migrate/20170620065449_add_foreign_key_to_ci_pipeline_schedule_variables.rb
+++ b/db/migrate/20170620065449_add_foreign_key_to_ci_pipeline_schedule_variables.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToCiPipelineScheduleVariables < ActiveRecord::Migration
+class AddForeignKeyToCiPipelineScheduleVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170622130029_correct_protected_branches_foreign_keys.rb b/db/migrate/20170622130029_correct_protected_branches_foreign_keys.rb
index 46497775527..c4ba3ec2cc0 100644
--- a/db/migrate/20170622130029_correct_protected_branches_foreign_keys.rb
+++ b/db/migrate/20170622130029_correct_protected_branches_foreign_keys.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CorrectProtectedBranchesForeignKeys < ActiveRecord::Migration
+class CorrectProtectedBranchesForeignKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170622132212_add_foreign_key_for_merge_request_diffs.rb b/db/migrate/20170622132212_add_foreign_key_for_merge_request_diffs.rb
index 9f524fac8a7..b826f67ff39 100644
--- a/db/migrate/20170622132212_add_foreign_key_for_merge_request_diffs.rb
+++ b/db/migrate/20170622132212_add_foreign_key_for_merge_request_diffs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddForeignKeyForMergeRequestDiffs < ActiveRecord::Migration
+class AddForeignKeyForMergeRequestDiffs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170622135451_rename_duplicated_variable_key.rb b/db/migrate/20170622135451_rename_duplicated_variable_key.rb
index 368718ab0ce..06a9529ae79 100644
--- a/db/migrate/20170622135451_rename_duplicated_variable_key.rb
+++ b/db/migrate/20170622135451_rename_duplicated_variable_key.rb
@@ -1,4 +1,4 @@
-class RenameDuplicatedVariableKey < ActiveRecord::Migration
+class RenameDuplicatedVariableKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170622135628_add_environment_scope_to_ci_variables.rb b/db/migrate/20170622135628_add_environment_scope_to_ci_variables.rb
index 17fe062d8d5..8fbb2ab57d5 100644
--- a/db/migrate/20170622135628_add_environment_scope_to_ci_variables.rb
+++ b/db/migrate/20170622135628_add_environment_scope_to_ci_variables.rb
@@ -1,4 +1,4 @@
-class AddEnvironmentScopeToCiVariables < ActiveRecord::Migration
+class AddEnvironmentScopeToCiVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb b/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb
index 787022b7bfe..240f55766d3 100644
--- a/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb
+++ b/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb
@@ -1,4 +1,4 @@
-class AddUniqueConstraintToCiVariables < ActiveRecord::Migration
+class AddUniqueConstraintToCiVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170622162730_add_ref_fetched_to_merge_request.rb b/db/migrate/20170622162730_add_ref_fetched_to_merge_request.rb
index 62aa1a4b4f0..4715ff7a715 100644
--- a/db/migrate/20170622162730_add_ref_fetched_to_merge_request.rb
+++ b/db/migrate/20170622162730_add_ref_fetched_to_merge_request.rb
@@ -1,4 +1,4 @@
-class AddRefFetchedToMergeRequest < ActiveRecord::Migration
+class AddRefFetchedToMergeRequest < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170623080805_remove_ci_variables_project_id_index.rb b/db/migrate/20170623080805_remove_ci_variables_project_id_index.rb
index ddcc0292b9d..861dbd2ee14 100644
--- a/db/migrate/20170623080805_remove_ci_variables_project_id_index.rb
+++ b/db/migrate/20170623080805_remove_ci_variables_project_id_index.rb
@@ -1,4 +1,4 @@
-class RemoveCiVariablesProjectIdIndex < ActiveRecord::Migration
+class RemoveCiVariablesProjectIdIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170629171610_rename_application_settings_signin_enabled_to_password_authentication_enabled.rb b/db/migrate/20170629171610_rename_application_settings_signin_enabled_to_password_authentication_enabled.rb
index 858b3bebace..1651a47ebec 100644
--- a/db/migrate/20170629171610_rename_application_settings_signin_enabled_to_password_authentication_enabled.rb
+++ b/db/migrate/20170629171610_rename_application_settings_signin_enabled_to_password_authentication_enabled.rb
@@ -1,4 +1,4 @@
-class RenameApplicationSettingsSigninEnabledToPasswordAuthenticationEnabled < ActiveRecord::Migration
+class RenameApplicationSettingsSigninEnabledToPasswordAuthenticationEnabled < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb b/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb
index a89d348b127..36ac360fb0b 100644
--- a/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb
+++ b/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb
@@ -1,4 +1,4 @@
-class AddStageIdForeignKeyToBuilds < ActiveRecord::Migration
+class AddStageIdForeignKeyToBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170706151212_add_performance_bar_allowed_group_id_to_application_settings.rb b/db/migrate/20170706151212_add_performance_bar_allowed_group_id_to_application_settings.rb
index fe9970ddc71..61416f74b63 100644
--- a/db/migrate/20170706151212_add_performance_bar_allowed_group_id_to_application_settings.rb
+++ b/db/migrate/20170706151212_add_performance_bar_allowed_group_id_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddPerformanceBarAllowedGroupIdToApplicationSettings < ActiveRecord::Migration
+class AddPerformanceBarAllowedGroupIdToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170707183807_add_group_id_to_milestones.rb b/db/migrate/20170707183807_add_group_id_to_milestones.rb
index 675ffd4a1c9..e778a30192f 100644
--- a/db/migrate/20170707183807_add_group_id_to_milestones.rb
+++ b/db/migrate/20170707183807_add_group_id_to_milestones.rb
@@ -1,4 +1,4 @@
-class AddGroupIdToMilestones < ActiveRecord::Migration
+class AddGroupIdToMilestones < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170707184243_add_group_milestone_id_indexes.rb b/db/migrate/20170707184243_add_group_milestone_id_indexes.rb
index aa48fe90cad..545ee070194 100644
--- a/db/migrate/20170707184243_add_group_milestone_id_indexes.rb
+++ b/db/migrate/20170707184243_add_group_milestone_id_indexes.rb
@@ -1,4 +1,4 @@
-class AddGroupMilestoneIdIndexes < ActiveRecord::Migration
+class AddGroupMilestoneIdIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20170707184244_remove_wrong_versions_from_schema_versions.rb b/db/migrate/20170707184244_remove_wrong_versions_from_schema_versions.rb
index 38536a8b06a..f99206c7f78 100644
--- a/db/migrate/20170707184244_remove_wrong_versions_from_schema_versions.rb
+++ b/db/migrate/20170707184244_remove_wrong_versions_from_schema_versions.rb
@@ -1,4 +1,4 @@
-class RemoveWrongVersionsFromSchemaVersions < ActiveRecord::Migration
+class RemoveWrongVersionsFromSchemaVersions < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170710083355_clean_stage_id_reference_migration.rb b/db/migrate/20170710083355_clean_stage_id_reference_migration.rb
index 681203eaf40..d33c6f53b15 100644
--- a/db/migrate/20170710083355_clean_stage_id_reference_migration.rb
+++ b/db/migrate/20170710083355_clean_stage_id_reference_migration.rb
@@ -1,4 +1,4 @@
-class CleanStageIdReferenceMigration < ActiveRecord::Migration
+class CleanStageIdReferenceMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170711145320_add_status_to_ci_stages.rb b/db/migrate/20170711145320_add_status_to_ci_stages.rb
index d497a61a959..3ea7b750882 100644
--- a/db/migrate/20170711145320_add_status_to_ci_stages.rb
+++ b/db/migrate/20170711145320_add_status_to_ci_stages.rb
@@ -1,4 +1,4 @@
-class AddStatusToCiStages < ActiveRecord::Migration
+class AddStatusToCiStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170713104829_add_foreign_key_to_merge_requests.rb b/db/migrate/20170713104829_add_foreign_key_to_merge_requests.rb
index c409915ceed..908b122c659 100644
--- a/db/migrate/20170713104829_add_foreign_key_to_merge_requests.rb
+++ b/db/migrate/20170713104829_add_foreign_key_to_merge_requests.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToMergeRequests < ActiveRecord::Migration
+class AddForeignKeyToMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170717074009_move_system_upload_folder.rb b/db/migrate/20170717074009_move_system_upload_folder.rb
index d3caa53a7a4..6c57a751c8d 100644
--- a/db/migrate/20170717074009_move_system_upload_folder.rb
+++ b/db/migrate/20170717074009_move_system_upload_folder.rb
@@ -1,4 +1,4 @@
-class MoveSystemUploadFolder < ActiveRecord::Migration
+class MoveSystemUploadFolder < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170717200542_add_trusted_column_to_oauth_applications.rb b/db/migrate/20170717200542_add_trusted_column_to_oauth_applications.rb
index 1a013e6aefb..d9ae86f6c52 100644
--- a/db/migrate/20170717200542_add_trusted_column_to_oauth_applications.rb
+++ b/db/migrate/20170717200542_add_trusted_column_to_oauth_applications.rb
@@ -1,4 +1,4 @@
-class AddTrustedColumnToOauthApplications < ActiveRecord::Migration
+class AddTrustedColumnToOauthApplications < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170720111708_add_lock_version_to_ci_stages.rb b/db/migrate/20170720111708_add_lock_version_to_ci_stages.rb
index e1c4f033286..a5caca7e80c 100644
--- a/db/migrate/20170720111708_add_lock_version_to_ci_stages.rb
+++ b/db/migrate/20170720111708_add_lock_version_to_ci_stages.rb
@@ -1,4 +1,4 @@
-class AddLockVersionToCiStages < ActiveRecord::Migration
+class AddLockVersionToCiStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170720122741_create_user_custom_attributes.rb b/db/migrate/20170720122741_create_user_custom_attributes.rb
index b1c0bebc633..0e6f37d7317 100644
--- a/db/migrate/20170720122741_create_user_custom_attributes.rb
+++ b/db/migrate/20170720122741_create_user_custom_attributes.rb
@@ -1,4 +1,4 @@
-class CreateUserCustomAttributes < ActiveRecord::Migration
+class CreateUserCustomAttributes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170720130522_create_ci_pipeline_variables.rb b/db/migrate/20170720130522_create_ci_pipeline_variables.rb
index a784f5dd142..4f162d46cf5 100644
--- a/db/migrate/20170720130522_create_ci_pipeline_variables.rb
+++ b/db/migrate/20170720130522_create_ci_pipeline_variables.rb
@@ -1,4 +1,4 @@
-class CreateCiPipelineVariables < ActiveRecord::Migration
+class CreateCiPipelineVariables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170720130749_add_foreign_key_to_ci_pipeline_variables.rb b/db/migrate/20170720130749_add_foreign_key_to_ci_pipeline_variables.rb
index 550b8a88f02..df9350d9ad5 100644
--- a/db/migrate/20170720130749_add_foreign_key_to_ci_pipeline_variables.rb
+++ b/db/migrate/20170720130749_add_foreign_key_to_ci_pipeline_variables.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToCiPipelineVariables < ActiveRecord::Migration
+class AddForeignKeyToCiPipelineVariables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170724214302_add_lower_path_index_to_redirect_routes.rb b/db/migrate/20170724214302_add_lower_path_index_to_redirect_routes.rb
index a770ff63b4e..1a6516f8777 100644
--- a/db/migrate/20170724214302_add_lower_path_index_to_redirect_routes.rb
+++ b/db/migrate/20170724214302_add_lower_path_index_to_redirect_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddLowerPathIndexToRedirectRoutes < ActiveRecord::Migration
+class AddLowerPathIndexToRedirectRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170725145659_add_binary_to_merge_request_diff_files.rb b/db/migrate/20170725145659_add_binary_to_merge_request_diff_files.rb
index 1f5fa7e3d49..c7d377547e4 100644
--- a/db/migrate/20170725145659_add_binary_to_merge_request_diff_files.rb
+++ b/db/migrate/20170725145659_add_binary_to_merge_request_diff_files.rb
@@ -1,4 +1,4 @@
-class AddBinaryToMergeRequestDiffFiles < ActiveRecord::Migration
+class AddBinaryToMergeRequestDiffFiles < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170727123534_add_index_on_events_project_id_id.rb b/db/migrate/20170727123534_add_index_on_events_project_id_id.rb
index 1c4aaaf9dd6..076b8ee87b2 100644
--- a/db/migrate/20170727123534_add_index_on_events_project_id_id.rb
+++ b/db/migrate/20170727123534_add_index_on_events_project_id_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexOnEventsProjectIdId < ActiveRecord::Migration
+class AddIndexOnEventsProjectIdId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170731175128_add_percentages_to_conv_dev.rb b/db/migrate/20170731175128_add_percentages_to_conv_dev.rb
index 1819bfc96bb..522e99c0751 100644
--- a/db/migrate/20170731175128_add_percentages_to_conv_dev.rb
+++ b/db/migrate/20170731175128_add_percentages_to_conv_dev.rb
@@ -1,4 +1,4 @@
-class AddPercentagesToConvDev < ActiveRecord::Migration
+class AddPercentagesToConvDev < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170731183033_add_merge_jid_to_merge_requests.rb b/db/migrate/20170731183033_add_merge_jid_to_merge_requests.rb
index a7d8f2f3604..3c677f3bc2d 100644
--- a/db/migrate/20170731183033_add_merge_jid_to_merge_requests.rb
+++ b/db/migrate/20170731183033_add_merge_jid_to_merge_requests.rb
@@ -1,4 +1,4 @@
-class AddMergeJidToMergeRequests < ActiveRecord::Migration
+class AddMergeJidToMergeRequests < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170802013652_add_storage_fields_to_project.rb b/db/migrate/20170802013652_add_storage_fields_to_project.rb
index c2381a9d0b2..d6672b9b3af 100644
--- a/db/migrate/20170802013652_add_storage_fields_to_project.rb
+++ b/db/migrate/20170802013652_add_storage_fields_to_project.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddStorageFieldsToProject < ActiveRecord::Migration
+class AddStorageFieldsToProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170803130232_reorganise_issues_indexes_for_faster_sorting.rb b/db/migrate/20170803130232_reorganise_issues_indexes_for_faster_sorting.rb
index eb7d1be1732..e92b5f28685 100644
--- a/db/migrate/20170803130232_reorganise_issues_indexes_for_faster_sorting.rb
+++ b/db/migrate/20170803130232_reorganise_issues_indexes_for_faster_sorting.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ReorganiseIssuesIndexesForFasterSorting < ActiveRecord::Migration
+class ReorganiseIssuesIndexesForFasterSorting < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170807071105_add_hashed_storage_to_settings.rb b/db/migrate/20170807071105_add_hashed_storage_to_settings.rb
index 0846557add8..cfb89743127 100644
--- a/db/migrate/20170807071105_add_hashed_storage_to_settings.rb
+++ b/db/migrate/20170807071105_add_hashed_storage_to_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddHashedStorageToSettings < ActiveRecord::Migration
+class AddHashedStorageToSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170809133343_add_broadcast_messages_index.rb b/db/migrate/20170809133343_add_broadcast_messages_index.rb
index 4ab2ddb059d..bcbc6c9f7d2 100644
--- a/db/migrate/20170809133343_add_broadcast_messages_index.rb
+++ b/db/migrate/20170809133343_add_broadcast_messages_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddBroadcastMessagesIndex < ActiveRecord::Migration
+class AddBroadcastMessagesIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170809134534_add_broadcast_message_not_null_constraints.rb b/db/migrate/20170809134534_add_broadcast_message_not_null_constraints.rb
index 5551fb51a6e..fd8cdbb95aa 100644
--- a/db/migrate/20170809134534_add_broadcast_message_not_null_constraints.rb
+++ b/db/migrate/20170809134534_add_broadcast_message_not_null_constraints.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddBroadcastMessageNotNullConstraints < ActiveRecord::Migration
+class AddBroadcastMessageNotNullConstraints < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170809142252_cleanup_appearances_schema.rb b/db/migrate/20170809142252_cleanup_appearances_schema.rb
index acf45060114..4c5d6a6d75d 100644
--- a/db/migrate/20170809142252_cleanup_appearances_schema.rb
+++ b/db/migrate/20170809142252_cleanup_appearances_schema.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupAppearancesSchema < ActiveRecord::Migration
+class CleanupAppearancesSchema < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170809161910_add_project_export_enabled_to_application_settings.rb b/db/migrate/20170809161910_add_project_export_enabled_to_application_settings.rb
index 4baba1ade6d..9dd520de264 100644
--- a/db/migrate/20170809161910_add_project_export_enabled_to_application_settings.rb
+++ b/db/migrate/20170809161910_add_project_export_enabled_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddProjectExportEnabledToApplicationSettings < ActiveRecord::Migration
+class AddProjectExportEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20170815221154_add_discussion_locked_to_issuable.rb b/db/migrate/20170815221154_add_discussion_locked_to_issuable.rb
index 5bd777c53a0..1444ca480b3 100644
--- a/db/migrate/20170815221154_add_discussion_locked_to_issuable.rb
+++ b/db/migrate/20170815221154_add_discussion_locked_to_issuable.rb
@@ -1,4 +1,4 @@
-class AddDiscussionLockedToIssuable < ActiveRecord::Migration
+class AddDiscussionLockedToIssuable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170816133938_add_access_level_to_ci_runners.rb b/db/migrate/20170816133938_add_access_level_to_ci_runners.rb
index fc484730f42..5a1ea9514d1 100644
--- a/db/migrate/20170816133938_add_access_level_to_ci_runners.rb
+++ b/db/migrate/20170816133938_add_access_level_to_ci_runners.rb
@@ -1,4 +1,4 @@
-class AddAccessLevelToCiRunners < ActiveRecord::Migration
+class AddAccessLevelToCiRunners < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170816133940_add_protected_to_ci_builds.rb b/db/migrate/20170816133940_add_protected_to_ci_builds.rb
index c73a4387d29..13e1be0d89c 100644
--- a/db/migrate/20170816133940_add_protected_to_ci_builds.rb
+++ b/db/migrate/20170816133940_add_protected_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddProtectedToCiBuilds < ActiveRecord::Migration
+class AddProtectedToCiBuilds < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170816143940_add_protected_to_ci_pipelines.rb b/db/migrate/20170816143940_add_protected_to_ci_pipelines.rb
index ce8f1e03686..aefaf4a487b 100644
--- a/db/migrate/20170816143940_add_protected_to_ci_pipelines.rb
+++ b/db/migrate/20170816143940_add_protected_to_ci_pipelines.rb
@@ -1,4 +1,4 @@
-class AddProtectedToCiPipelines < ActiveRecord::Migration
+class AddProtectedToCiPipelines < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170816153940_add_index_on_ci_builds_protected.rb b/db/migrate/20170816153940_add_index_on_ci_builds_protected.rb
index caf7c705a6e..fbe5fe31ae8 100644
--- a/db/migrate/20170816153940_add_index_on_ci_builds_protected.rb
+++ b/db/migrate/20170816153940_add_index_on_ci_builds_protected.rb
@@ -1,4 +1,4 @@
-class AddIndexOnCiBuildsProtected < ActiveRecord::Migration
+class AddIndexOnCiBuildsProtected < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170816234252_add_theme_id_to_users.rb b/db/migrate/20170816234252_add_theme_id_to_users.rb
index 5043f9ec591..bd04445cac6 100644
--- a/db/migrate/20170816234252_add_theme_id_to_users.rb
+++ b/db/migrate/20170816234252_add_theme_id_to_users.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddThemeIdToUsers < ActiveRecord::Migration
+class AddThemeIdToUsers < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170817123339_add_verification_status_to_gpg_signatures.rb b/db/migrate/20170817123339_add_verification_status_to_gpg_signatures.rb
index 128cd109f8d..c7d81dc005a 100644
--- a/db/migrate/20170817123339_add_verification_status_to_gpg_signatures.rb
+++ b/db/migrate/20170817123339_add_verification_status_to_gpg_signatures.rb
@@ -1,4 +1,4 @@
-class AddVerificationStatusToGpgSignatures < ActiveRecord::Migration
+class AddVerificationStatusToGpgSignatures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   include Gitlab::Database::MigrationHelpers
diff --git a/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
index 229298e1946..82e05885b0e 100644
--- a/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
+++ b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CorrectProtectedTagsForeignKeys < ActiveRecord::Migration
+class CorrectProtectedTagsForeignKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170820120108_create_user_synced_attributes_metadata.rb b/db/migrate/20170820120108_create_user_synced_attributes_metadata.rb
index 79028e34987..131dcf7ac25 100644
--- a/db/migrate/20170820120108_create_user_synced_attributes_metadata.rb
+++ b/db/migrate/20170820120108_create_user_synced_attributes_metadata.rb
@@ -1,4 +1,4 @@
-class CreateUserSyncedAttributesMetadata < ActiveRecord::Migration
+class CreateUserSyncedAttributesMetadata < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170824101926_add_auto_devops_enabled_to_application_settings.rb b/db/migrate/20170824101926_add_auto_devops_enabled_to_application_settings.rb
index da518d8215c..f7c0aeab8f9 100644
--- a/db/migrate/20170824101926_add_auto_devops_enabled_to_application_settings.rb
+++ b/db/migrate/20170824101926_add_auto_devops_enabled_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddAutoDevopsEnabledToApplicationSettings < ActiveRecord::Migration
+class AddAutoDevopsEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170824162758_allow_appearances_description_html_null.rb b/db/migrate/20170824162758_allow_appearances_description_html_null.rb
index d7f481ee894..6efa3452796 100644
--- a/db/migrate/20170824162758_allow_appearances_description_html_null.rb
+++ b/db/migrate/20170824162758_allow_appearances_description_html_null.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AllowAppearancesDescriptionHtmlNull < ActiveRecord::Migration
+class AllowAppearancesDescriptionHtmlNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170825015534_add_file_store_to_lfs_objects.rb b/db/migrate/20170825015534_add_file_store_to_lfs_objects.rb
index 41bb031014f..be543ffc983 100644
--- a/db/migrate/20170825015534_add_file_store_to_lfs_objects.rb
+++ b/db/migrate/20170825015534_add_file_store_to_lfs_objects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddFileStoreToLfsObjects < ActiveRecord::Migration
+class AddFileStoreToLfsObjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170825104051_migrate_issues_to_ghost_user.rb b/db/migrate/20170825104051_migrate_issues_to_ghost_user.rb
index c5fb5762d61..b1adccc9c5c 100644
--- a/db/migrate/20170825104051_migrate_issues_to_ghost_user.rb
+++ b/db/migrate/20170825104051_migrate_issues_to_ghost_user.rb
@@ -1,4 +1,4 @@
-class MigrateIssuesToGhostUser < ActiveRecord::Migration
+class MigrateIssuesToGhostUser < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/migrate/20170825154015_resolve_outdated_diff_discussions.rb b/db/migrate/20170825154015_resolve_outdated_diff_discussions.rb
index 235530bb1e6..1aed21f10a0 100644
--- a/db/migrate/20170825154015_resolve_outdated_diff_discussions.rb
+++ b/db/migrate/20170825154015_resolve_outdated_diff_discussions.rb
@@ -1,4 +1,4 @@
-class ResolveOutdatedDiffDiscussions < ActiveRecord::Migration
+class ResolveOutdatedDiffDiscussions < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170827123848_add_index_on_merge_request_diff_commit_sha.rb b/db/migrate/20170827123848_add_index_on_merge_request_diff_commit_sha.rb
index 2140ff7b05e..e2061b5600a 100644
--- a/db/migrate/20170827123848_add_index_on_merge_request_diff_commit_sha.rb
+++ b/db/migrate/20170827123848_add_index_on_merge_request_diff_commit_sha.rb
@@ -1,6 +1,6 @@
 # rubocop:disable RemoveIndex
 
-class AddIndexOnMergeRequestDiffCommitSha < ActiveRecord::Migration
+class AddIndexOnMergeRequestDiffCommitSha < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170828093725_create_project_auto_dev_ops.rb b/db/migrate/20170828093725_create_project_auto_dev_ops.rb
index c1bb4f20c1d..ea895dc14c1 100644
--- a/db/migrate/20170828093725_create_project_auto_dev_ops.rb
+++ b/db/migrate/20170828093725_create_project_auto_dev_ops.rb
@@ -1,4 +1,4 @@
-class CreateProjectAutoDevOps < ActiveRecord::Migration
+class CreateProjectAutoDevOps < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170828135939_migrate_user_external_mail_data.rb b/db/migrate/20170828135939_migrate_user_external_mail_data.rb
index f7ac87374b6..9ee4a4598bf 100644
--- a/db/migrate/20170828135939_migrate_user_external_mail_data.rb
+++ b/db/migrate/20170828135939_migrate_user_external_mail_data.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateUserExternalMailData < ActiveRecord::Migration
+class MigrateUserExternalMailData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170830125940_add_failure_reason_to_ci_builds.rb b/db/migrate/20170830125940_add_failure_reason_to_ci_builds.rb
index 5a7487b9227..44f709868ca 100644
--- a/db/migrate/20170830125940_add_failure_reason_to_ci_builds.rb
+++ b/db/migrate/20170830125940_add_failure_reason_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddFailureReasonToCiBuilds < ActiveRecord::Migration
+class AddFailureReasonToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb b/db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb
index 0dfdc4ed261..bcc34d56d2d 100644
--- a/db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb
+++ b/db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class StealRemainingEventMigrationJobs < ActiveRecord::Migration
+class StealRemainingEventMigrationJobs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170830131015_swap_event_migration_tables.rb b/db/migrate/20170830131015_swap_event_migration_tables.rb
index a256de4a8af..fb3b2472ffe 100644
--- a/db/migrate/20170830131015_swap_event_migration_tables.rb
+++ b/db/migrate/20170830131015_swap_event_migration_tables.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class SwapEventMigrationTables < ActiveRecord::Migration
+class SwapEventMigrationTables < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170831092813_add_config_source_to_pipelines.rb b/db/migrate/20170831092813_add_config_source_to_pipelines.rb
index ff51e968abd..ba1f73f0e68 100644
--- a/db/migrate/20170831092813_add_config_source_to_pipelines.rb
+++ b/db/migrate/20170831092813_add_config_source_to_pipelines.rb
@@ -1,4 +1,4 @@
-class AddConfigSourceToPipelines < ActiveRecord::Migration
+class AddConfigSourceToPipelines < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170901071411_add_foreign_key_to_issue_author.rb b/db/migrate/20170901071411_add_foreign_key_to_issue_author.rb
index ab6e9fb565a..00d0b0f2c7f 100644
--- a/db/migrate/20170901071411_add_foreign_key_to_issue_author.rb
+++ b/db/migrate/20170901071411_add_foreign_key_to_issue_author.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyToIssueAuthor < ActiveRecord::Migration
+class AddForeignKeyToIssueAuthor < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170904092148_add_email_confirmation.rb b/db/migrate/20170904092148_add_email_confirmation.rb
index 17ff424b319..8bfb2005936 100644
--- a/db/migrate/20170904092148_add_email_confirmation.rb
+++ b/db/migrate/20170904092148_add_email_confirmation.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddEmailConfirmation < ActiveRecord::Migration
+class AddEmailConfirmation < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170905112933_add_resolved_by_push_to_notes.rb b/db/migrate/20170905112933_add_resolved_by_push_to_notes.rb
index ceb31ffb08a..1f27ea3c467 100644
--- a/db/migrate/20170905112933_add_resolved_by_push_to_notes.rb
+++ b/db/migrate/20170905112933_add_resolved_by_push_to_notes.rb
@@ -1,4 +1,4 @@
-class AddResolvedByPushToNotes < ActiveRecord::Migration
+class AddResolvedByPushToNotes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170906133745_add_runners_token_to_groups.rb b/db/migrate/20170906133745_add_runners_token_to_groups.rb
index 852f4cba670..a02160feb83 100644
--- a/db/migrate/20170906133745_add_runners_token_to_groups.rb
+++ b/db/migrate/20170906133745_add_runners_token_to_groups.rb
@@ -1,4 +1,4 @@
-class AddRunnersTokenToGroups < ActiveRecord::Migration
+class AddRunnersTokenToGroups < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170909090114_add_email_confirmation_index.rb b/db/migrate/20170909090114_add_email_confirmation_index.rb
index a8c1023c482..31c48db2bd2 100644
--- a/db/migrate/20170909090114_add_email_confirmation_index.rb
+++ b/db/migrate/20170909090114_add_email_confirmation_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddEmailConfirmationIndex < ActiveRecord::Migration
+class AddEmailConfirmationIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170909150936_add_spent_at_to_timelogs.rb b/db/migrate/20170909150936_add_spent_at_to_timelogs.rb
index ffff719c289..3a2c900b445 100644
--- a/db/migrate/20170909150936_add_spent_at_to_timelogs.rb
+++ b/db/migrate/20170909150936_add_spent_at_to_timelogs.rb
@@ -1,4 +1,4 @@
-class AddSpentAtToTimelogs < ActiveRecord::Migration
+class AddSpentAtToTimelogs < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20170912113435_clean_stages_statuses_migration.rb b/db/migrate/20170912113435_clean_stages_statuses_migration.rb
index fc091d7894e..f2040f819cd 100644
--- a/db/migrate/20170912113435_clean_stages_statuses_migration.rb
+++ b/db/migrate/20170912113435_clean_stages_statuses_migration.rb
@@ -1,4 +1,4 @@
-class CleanStagesStatusesMigration < ActiveRecord::Migration
+class CleanStagesStatusesMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170913131410_environments_project_id_not_null.rb b/db/migrate/20170913131410_environments_project_id_not_null.rb
index d5404f8ede9..ba66113945b 100644
--- a/db/migrate/20170913131410_environments_project_id_not_null.rb
+++ b/db/migrate/20170913131410_environments_project_id_not_null.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class EnvironmentsProjectIdNotNull < ActiveRecord::Migration
+class EnvironmentsProjectIdNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170914135630_add_index_for_recent_push_events.rb b/db/migrate/20170914135630_add_index_for_recent_push_events.rb
index 99f593b0465..ac86185ba50 100644
--- a/db/migrate/20170914135630_add_index_for_recent_push_events.rb
+++ b/db/migrate/20170914135630_add_index_for_recent_push_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexForRecentPushEvents < ActiveRecord::Migration
+class AddIndexForRecentPushEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170918072948_create_job_artifacts.rb b/db/migrate/20170918072948_create_job_artifacts.rb
index 95f2c6c8ce8..4dd24aaff99 100644
--- a/db/migrate/20170918072948_create_job_artifacts.rb
+++ b/db/migrate/20170918072948_create_job_artifacts.rb
@@ -1,4 +1,4 @@
-class CreateJobArtifacts < ActiveRecord::Migration
+class CreateJobArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170918072949_add_file_store_job_artifacts.rb b/db/migrate/20170918072949_add_file_store_job_artifacts.rb
index b1f1bea6deb..3eb355c9305 100644
--- a/db/migrate/20170918072949_add_file_store_job_artifacts.rb
+++ b/db/migrate/20170918072949_add_file_store_job_artifacts.rb
@@ -1,4 +1,4 @@
-class AddFileStoreJobArtifacts < ActiveRecord::Migration
+class AddFileStoreJobArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20170918111708_create_project_custom_attributes.rb b/db/migrate/20170918111708_create_project_custom_attributes.rb
index b5bc90ec02e..bd6064689ff 100644
--- a/db/migrate/20170918111708_create_project_custom_attributes.rb
+++ b/db/migrate/20170918111708_create_project_custom_attributes.rb
@@ -1,4 +1,4 @@
-class CreateProjectCustomAttributes < ActiveRecord::Migration
+class CreateProjectCustomAttributes < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170918140927_create_group_custom_attributes.rb b/db/migrate/20170918140927_create_group_custom_attributes.rb
index 3879ea15eb6..215a0f16b6f 100644
--- a/db/migrate/20170918140927_create_group_custom_attributes.rb
+++ b/db/migrate/20170918140927_create_group_custom_attributes.rb
@@ -1,4 +1,4 @@
-class CreateGroupCustomAttributes < ActiveRecord::Migration
+class CreateGroupCustomAttributes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170918222253_reorganize_deployments_indexes.rb b/db/migrate/20170918222253_reorganize_deployments_indexes.rb
index 139427ed2b9..480847ac393 100644
--- a/db/migrate/20170918222253_reorganize_deployments_indexes.rb
+++ b/db/migrate/20170918222253_reorganize_deployments_indexes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ReorganizeDeploymentsIndexes < ActiveRecord::Migration
+class ReorganizeDeploymentsIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170918223303_add_deployments_index_for_last_deployment.rb b/db/migrate/20170918223303_add_deployments_index_for_last_deployment.rb
index b91efb86d98..8e165ac647d 100644
--- a/db/migrate/20170918223303_add_deployments_index_for_last_deployment.rb
+++ b/db/migrate/20170918223303_add_deployments_index_for_last_deployment.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddDeploymentsIndexForLastDeployment < ActiveRecord::Migration
+class AddDeploymentsIndexForLastDeployment < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb b/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb
index 8423bf13fd9..23c94a809d4 100644
--- a/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb
+++ b/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveTemporaryCiBuildsIndex < ActiveRecord::Migration
+class RemoveTemporaryCiBuildsIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170921115009_add_project_repository_storage_index.rb b/db/migrate/20170921115009_add_project_repository_storage_index.rb
index 1c5a8fd65e1..9e1f5052f28 100644
--- a/db/migrate/20170921115009_add_project_repository_storage_index.rb
+++ b/db/migrate/20170921115009_add_project_repository_storage_index.rb
@@ -1,4 +1,4 @@
-class AddProjectRepositoryStorageIndex < ActiveRecord::Migration
+class AddProjectRepositoryStorageIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170924094327_create_gcp_clusters.rb b/db/migrate/20170924094327_create_gcp_clusters.rb
index 657dddcbbc4..43201f75ad7 100644
--- a/db/migrate/20170924094327_create_gcp_clusters.rb
+++ b/db/migrate/20170924094327_create_gcp_clusters.rb
@@ -1,4 +1,4 @@
-class CreateGcpClusters < ActiveRecord::Migration
+class CreateGcpClusters < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170925184228_add_favicon_to_appearances.rb b/db/migrate/20170925184228_add_favicon_to_appearances.rb
index 65083733afb..1ce750f7e83 100644
--- a/db/migrate/20170925184228_add_favicon_to_appearances.rb
+++ b/db/migrate/20170925184228_add_favicon_to_appearances.rb
@@ -1,4 +1,4 @@
-class AddFaviconToAppearances < ActiveRecord::Migration
+class AddFaviconToAppearances < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20170927095921_add_ci_builds_index_for_jobscontroller.rb b/db/migrate/20170927095921_add_ci_builds_index_for_jobscontroller.rb
index c2cb1df2586..85aa78006db 100644
--- a/db/migrate/20170927095921_add_ci_builds_index_for_jobscontroller.rb
+++ b/db/migrate/20170927095921_add_ci_builds_index_for_jobscontroller.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddCiBuildsIndexForJobscontroller < ActiveRecord::Migration
+class AddCiBuildsIndexForJobscontroller < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170927122209_add_partial_index_for_labels_template.rb b/db/migrate/20170927122209_add_partial_index_for_labels_template.rb
index c3e5077ba20..dd79e024df4 100644
--- a/db/migrate/20170927122209_add_partial_index_for_labels_template.rb
+++ b/db/migrate/20170927122209_add_partial_index_for_labels_template.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPartialIndexForLabelsTemplate < ActiveRecord::Migration
+class AddPartialIndexForLabelsTemplate < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170927161718_create_gpg_key_subkeys.rb b/db/migrate/20170927161718_create_gpg_key_subkeys.rb
index d9dc2404cac..3b5d452ee12 100644
--- a/db/migrate/20170927161718_create_gpg_key_subkeys.rb
+++ b/db/migrate/20170927161718_create_gpg_key_subkeys.rb
@@ -1,4 +1,4 @@
-class CreateGpgKeySubkeys < ActiveRecord::Migration
+class CreateGpgKeySubkeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170928100231_add_composite_index_on_merge_requests_merge_commit_sha.rb b/db/migrate/20170928100231_add_composite_index_on_merge_requests_merge_commit_sha.rb
index 9f02daf04c1..cb16589e8db 100644
--- a/db/migrate/20170928100231_add_composite_index_on_merge_requests_merge_commit_sha.rb
+++ b/db/migrate/20170928100231_add_composite_index_on_merge_requests_merge_commit_sha.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddCompositeIndexOnMergeRequestsMergeCommitSha < ActiveRecord::Migration
+class AddCompositeIndexOnMergeRequestsMergeCommitSha < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20170928124105_create_fork_networks.rb b/db/migrate/20170928124105_create_fork_networks.rb
index 89e5b871967..01f623117f5 100644
--- a/db/migrate/20170928124105_create_fork_networks.rb
+++ b/db/migrate/20170928124105_create_fork_networks.rb
@@ -1,4 +1,4 @@
-class CreateForkNetworks < ActiveRecord::Migration
+class CreateForkNetworks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170928133643_create_fork_network_members.rb b/db/migrate/20170928133643_create_fork_network_members.rb
index 8c7d9ba859a..e2a6d7b0e8a 100644
--- a/db/migrate/20170928133643_create_fork_network_members.rb
+++ b/db/migrate/20170928133643_create_fork_network_members.rb
@@ -1,4 +1,4 @@
-class CreateForkNetworkMembers < ActiveRecord::Migration
+class CreateForkNetworkMembers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170929080234_add_failure_reason_to_pipelines.rb b/db/migrate/20170929080234_add_failure_reason_to_pipelines.rb
index 82adddbc1ec..e000ee27eef 100644
--- a/db/migrate/20170929080234_add_failure_reason_to_pipelines.rb
+++ b/db/migrate/20170929080234_add_failure_reason_to_pipelines.rb
@@ -1,4 +1,4 @@
-class AddFailureReasonToPipelines < ActiveRecord::Migration
+class AddFailureReasonToPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20170929131201_populate_fork_networks.rb b/db/migrate/20170929131201_populate_fork_networks.rb
index ddbf27e1852..ba4f8ef2531 100644
--- a/db/migrate/20170929131201_populate_fork_networks.rb
+++ b/db/migrate/20170929131201_populate_fork_networks.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PopulateForkNetworks < ActiveRecord::Migration
+class PopulateForkNetworks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171004121444_make_sure_fast_forward_option_exists.rb b/db/migrate/20171004121444_make_sure_fast_forward_option_exists.rb
index ac266c3e22e..9b417de1793 100644
--- a/db/migrate/20171004121444_make_sure_fast_forward_option_exists.rb
+++ b/db/migrate/20171004121444_make_sure_fast_forward_option_exists.rb
@@ -1,5 +1,5 @@
 # rubocop:disable all
-class MakeSureFastForwardOptionExists < ActiveRecord::Migration
+class MakeSureFastForwardOptionExists < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171006090001_create_ci_build_trace_sections.rb b/db/migrate/20171006090001_create_ci_build_trace_sections.rb
index ab5ef319618..a2eca0832f2 100644
--- a/db/migrate/20171006090001_create_ci_build_trace_sections.rb
+++ b/db/migrate/20171006090001_create_ci_build_trace_sections.rb
@@ -1,4 +1,4 @@
-class CreateCiBuildTraceSections < ActiveRecord::Migration
+class CreateCiBuildTraceSections < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171006090010_add_build_foreign_key_to_ci_build_trace_sections.rb b/db/migrate/20171006090010_add_build_foreign_key_to_ci_build_trace_sections.rb
index d279463eb4b..7b17763ac84 100644
--- a/db/migrate/20171006090010_add_build_foreign_key_to_ci_build_trace_sections.rb
+++ b/db/migrate/20171006090010_add_build_foreign_key_to_ci_build_trace_sections.rb
@@ -1,4 +1,4 @@
-class AddBuildForeignKeyToCiBuildTraceSections < ActiveRecord::Migration
+class AddBuildForeignKeyToCiBuildTraceSections < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171006090100_create_ci_build_trace_section_names.rb b/db/migrate/20171006090100_create_ci_build_trace_section_names.rb
index 88f3e60699a..00a38fa59c2 100644
--- a/db/migrate/20171006090100_create_ci_build_trace_section_names.rb
+++ b/db/migrate/20171006090100_create_ci_build_trace_section_names.rb
@@ -1,4 +1,4 @@
-class CreateCiBuildTraceSectionNames < ActiveRecord::Migration
+class CreateCiBuildTraceSectionNames < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171006091000_add_name_foreign_key_to_ci_build_trace_sections.rb b/db/migrate/20171006091000_add_name_foreign_key_to_ci_build_trace_sections.rb
index 08422885a98..1342ff013b7 100644
--- a/db/migrate/20171006091000_add_name_foreign_key_to_ci_build_trace_sections.rb
+++ b/db/migrate/20171006091000_add_name_foreign_key_to_ci_build_trace_sections.rb
@@ -1,4 +1,4 @@
-class AddNameForeignKeyToCiBuildTraceSections < ActiveRecord::Migration
+class AddNameForeignKeyToCiBuildTraceSections < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171006220837_add_global_rate_limits_to_application_settings.rb b/db/migrate/20171006220837_add_global_rate_limits_to_application_settings.rb
index 55e822752af..96d76069b35 100644
--- a/db/migrate/20171006220837_add_global_rate_limits_to_application_settings.rb
+++ b/db/migrate/20171006220837_add_global_rate_limits_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddGlobalRateLimitsToApplicationSettings < ActiveRecord::Migration
+class AddGlobalRateLimitsToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171012101043_add_circuit_breaker_properties_to_application_settings.rb b/db/migrate/20171012101043_add_circuit_breaker_properties_to_application_settings.rb
index bcf7dbd8e64..91bba07b4d7 100644
--- a/db/migrate/20171012101043_add_circuit_breaker_properties_to_application_settings.rb
+++ b/db/migrate/20171012101043_add_circuit_breaker_properties_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddCircuitBreakerPropertiesToApplicationSettings < ActiveRecord::Migration
+class AddCircuitBreakerPropertiesToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171012125712_migrate_user_authentication_token_to_personal_access_token.rb b/db/migrate/20171012125712_migrate_user_authentication_token_to_personal_access_token.rb
index 9a909644a44..305c12e31f8 100644
--- a/db/migrate/20171012125712_migrate_user_authentication_token_to_personal_access_token.rb
+++ b/db/migrate/20171012125712_migrate_user_authentication_token_to_personal_access_token.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateUserAuthenticationTokenToPersonalAccessToken < ActiveRecord::Migration
+class MigrateUserAuthenticationTokenToPersonalAccessToken < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171013094327_create_new_clusters_architectures.rb b/db/migrate/20171013094327_create_new_clusters_architectures.rb
index dabb3e25e48..98f91e6130f 100644
--- a/db/migrate/20171013094327_create_new_clusters_architectures.rb
+++ b/db/migrate/20171013094327_create_new_clusters_architectures.rb
@@ -1,4 +1,4 @@
-class CreateNewClustersArchitectures < ActiveRecord::Migration
+class CreateNewClustersArchitectures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20171017145932_add_new_circuitbreaker_settings_to_application_settings.rb b/db/migrate/20171017145932_add_new_circuitbreaker_settings_to_application_settings.rb
index 07eb25c0b0f..4a0cadea364 100644
--- a/db/migrate/20171017145932_add_new_circuitbreaker_settings_to_application_settings.rb
+++ b/db/migrate/20171017145932_add_new_circuitbreaker_settings_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddNewCircuitbreakerSettingsToApplicationSettings < ActiveRecord::Migration
+class AddNewCircuitbreakerSettingsToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171019141859_fix_dev_timezone_schema.rb b/db/migrate/20171019141859_fix_dev_timezone_schema.rb
index fb7c17dd747..68c8b528e17 100644
--- a/db/migrate/20171019141859_fix_dev_timezone_schema.rb
+++ b/db/migrate/20171019141859_fix_dev_timezone_schema.rb
@@ -1,4 +1,4 @@
-class FixDevTimezoneSchema < ActiveRecord::Migration
+class FixDevTimezoneSchema < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # The this migrations tries to help solve unwanted changes to `schema.rb`
diff --git a/db/migrate/20171025110159_add_latest_merge_request_diff_id_to_merge_requests.rb b/db/migrate/20171025110159_add_latest_merge_request_diff_id_to_merge_requests.rb
index 74a2badc130..1af0cf70958 100644
--- a/db/migrate/20171025110159_add_latest_merge_request_diff_id_to_merge_requests.rb
+++ b/db/migrate/20171025110159_add_latest_merge_request_diff_id_to_merge_requests.rb
@@ -1,4 +1,4 @@
-class AddLatestMergeRequestDiffIdToMergeRequests < ActiveRecord::Migration
+class AddLatestMergeRequestDiffIdToMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171031100710_create_clusters_kubernetes_helm_apps.rb b/db/migrate/20171031100710_create_clusters_kubernetes_helm_apps.rb
index a2ce37127ea..0af05f5c94a 100644
--- a/db/migrate/20171031100710_create_clusters_kubernetes_helm_apps.rb
+++ b/db/migrate/20171031100710_create_clusters_kubernetes_helm_apps.rb
@@ -1,4 +1,4 @@
-class CreateClustersKubernetesHelmApps < ActiveRecord::Migration
+class CreateClustersKubernetesHelmApps < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171101130535_add_gitaly_timeout_properties_to_application_settings.rb b/db/migrate/20171101130535_add_gitaly_timeout_properties_to_application_settings.rb
index de621e7111c..6d60fdc6132 100644
--- a/db/migrate/20171101130535_add_gitaly_timeout_properties_to_application_settings.rb
+++ b/db/migrate/20171101130535_add_gitaly_timeout_properties_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddGitalyTimeoutPropertiesToApplicationSettings < ActiveRecord::Migration
+class AddGitalyTimeoutPropertiesToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171103000000_set_uploads_path_size_for_mysql.rb b/db/migrate/20171103000000_set_uploads_path_size_for_mysql.rb
index 1fbe505f804..93cec87f999 100644
--- a/db/migrate/20171103000000_set_uploads_path_size_for_mysql.rb
+++ b/db/migrate/20171103000000_set_uploads_path_size_for_mysql.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class SetUploadsPathSizeForMysql < ActiveRecord::Migration
+class SetUploadsPathSizeForMysql < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106101200_create_clusters_kubernetes_ingress_apps.rb b/db/migrate/20171106101200_create_clusters_kubernetes_ingress_apps.rb
index 21f48b1d1b4..770cb94ee18 100644
--- a/db/migrate/20171106101200_create_clusters_kubernetes_ingress_apps.rb
+++ b/db/migrate/20171106101200_create_clusters_kubernetes_ingress_apps.rb
@@ -1,4 +1,4 @@
-class CreateClustersKubernetesIngressApps < ActiveRecord::Migration
+class CreateClustersKubernetesIngressApps < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171106132212_issues_confidential_not_null.rb b/db/migrate/20171106132212_issues_confidential_not_null.rb
index c959d2dd938..444a38c2dc5 100644
--- a/db/migrate/20171106132212_issues_confidential_not_null.rb
+++ b/db/migrate/20171106132212_issues_confidential_not_null.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IssuesConfidentialNotNull < ActiveRecord::Migration
+class IssuesConfidentialNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106133143_rename_application_settings_password_authentication_enabled_to_password_authentication_enabled_for_web.rb b/db/migrate/20171106133143_rename_application_settings_password_authentication_enabled_to_password_authentication_enabled_for_web.rb
index 6d369e93361..58762a4f852 100644
--- a/db/migrate/20171106133143_rename_application_settings_password_authentication_enabled_to_password_authentication_enabled_for_web.rb
+++ b/db/migrate/20171106133143_rename_application_settings_password_authentication_enabled_to_password_authentication_enabled_for_web.rb
@@ -1,4 +1,4 @@
-class RenameApplicationSettingsPasswordAuthenticationEnabledToPasswordAuthenticationEnabledForWeb < ActiveRecord::Migration
+class RenameApplicationSettingsPasswordAuthenticationEnabledToPasswordAuthenticationEnabledForWeb < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171106133911_add_password_authentication_enabled_for_git_to_application_settings.rb b/db/migrate/20171106133911_add_password_authentication_enabled_for_git_to_application_settings.rb
index b8aa600864e..1f96a0426a1 100644
--- a/db/migrate/20171106133911_add_password_authentication_enabled_for_git_to_application_settings.rb
+++ b/db/migrate/20171106133911_add_password_authentication_enabled_for_git_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddPasswordAuthenticationEnabledForGitToApplicationSettings < ActiveRecord::Migration
+class AddPasswordAuthenticationEnabledForGitToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171106135924_issues_milestone_id_foreign_key.rb b/db/migrate/20171106135924_issues_milestone_id_foreign_key.rb
index bfb3dcae511..1de7d5e768e 100644
--- a/db/migrate/20171106135924_issues_milestone_id_foreign_key.rb
+++ b/db/migrate/20171106135924_issues_milestone_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IssuesMilestoneIdForeignKey < ActiveRecord::Migration
+class IssuesMilestoneIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106150657_issues_updated_by_id_foreign_key.rb b/db/migrate/20171106150657_issues_updated_by_id_foreign_key.rb
index 3b8844d7d9f..b2992b1ff5d 100644
--- a/db/migrate/20171106150657_issues_updated_by_id_foreign_key.rb
+++ b/db/migrate/20171106150657_issues_updated_by_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IssuesUpdatedByIdForeignKey < ActiveRecord::Migration
+class IssuesUpdatedByIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106151218_issues_moved_to_id_foreign_key.rb b/db/migrate/20171106151218_issues_moved_to_id_foreign_key.rb
index 6395462384b..66bfb5718dc 100644
--- a/db/migrate/20171106151218_issues_moved_to_id_foreign_key.rb
+++ b/db/migrate/20171106151218_issues_moved_to_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class IssuesMovedToIdForeignKey < ActiveRecord::Migration
+class IssuesMovedToIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106155656_turn_issues_due_date_index_to_partial_index.rb b/db/migrate/20171106155656_turn_issues_due_date_index_to_partial_index.rb
index 08784de4043..58392de5e6b 100644
--- a/db/migrate/20171106155656_turn_issues_due_date_index_to_partial_index.rb
+++ b/db/migrate/20171106155656_turn_issues_due_date_index_to_partial_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class TurnIssuesDueDateIndexToPartialIndex < ActiveRecord::Migration
+class TurnIssuesDueDateIndexToPartialIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171106171453_add_timezone_to_issues_closed_at.rb b/db/migrate/20171106171453_add_timezone_to_issues_closed_at.rb
index 0f1e937545b..c6edc1af6cb 100644
--- a/db/migrate/20171106171453_add_timezone_to_issues_closed_at.rb
+++ b/db/migrate/20171106171453_add_timezone_to_issues_closed_at.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddTimezoneToIssuesClosedAt < ActiveRecord::Migration
+class AddTimezoneToIssuesClosedAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114150259_merge_requests_author_id_foreign_key.rb b/db/migrate/20171114150259_merge_requests_author_id_foreign_key.rb
index 021eaa04a0c..4ebb6fad059 100644
--- a/db/migrate/20171114150259_merge_requests_author_id_foreign_key.rb
+++ b/db/migrate/20171114150259_merge_requests_author_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsAuthorIdForeignKey < ActiveRecord::Migration
+class MergeRequestsAuthorIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114160005_merge_requests_assignee_id_foreign_key.rb b/db/migrate/20171114160005_merge_requests_assignee_id_foreign_key.rb
index 1a242f01051..73c177c44f9 100644
--- a/db/migrate/20171114160005_merge_requests_assignee_id_foreign_key.rb
+++ b/db/migrate/20171114160005_merge_requests_assignee_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsAssigneeIdForeignKey < ActiveRecord::Migration
+class MergeRequestsAssigneeIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114160904_merge_requests_updated_by_id_foreign_key.rb b/db/migrate/20171114160904_merge_requests_updated_by_id_foreign_key.rb
index eb3872e38da..69f9c181c10 100644
--- a/db/migrate/20171114160904_merge_requests_updated_by_id_foreign_key.rb
+++ b/db/migrate/20171114160904_merge_requests_updated_by_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsUpdatedByIdForeignKey < ActiveRecord::Migration
+class MergeRequestsUpdatedByIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114161720_merge_requests_merge_user_id_foreign_key.rb b/db/migrate/20171114161720_merge_requests_merge_user_id_foreign_key.rb
index 925b3e537d7..ccd275d5bb4 100644
--- a/db/migrate/20171114161720_merge_requests_merge_user_id_foreign_key.rb
+++ b/db/migrate/20171114161720_merge_requests_merge_user_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsMergeUserIdForeignKey < ActiveRecord::Migration
+class MergeRequestsMergeUserIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114161914_merge_requests_source_project_id_foreign_key.rb b/db/migrate/20171114161914_merge_requests_source_project_id_foreign_key.rb
index 99740f64fe6..250928a6551 100644
--- a/db/migrate/20171114161914_merge_requests_source_project_id_foreign_key.rb
+++ b/db/migrate/20171114161914_merge_requests_source_project_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsSourceProjectIdForeignKey < ActiveRecord::Migration
+class MergeRequestsSourceProjectIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171114162227_merge_requests_milestone_id_foreign_key.rb b/db/migrate/20171114162227_merge_requests_milestone_id_foreign_key.rb
index c005cf7d173..cafe0ce0853 100644
--- a/db/migrate/20171114162227_merge_requests_milestone_id_foreign_key.rb
+++ b/db/migrate/20171114162227_merge_requests_milestone_id_foreign_key.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsMilestoneIdForeignKey < ActiveRecord::Migration
+class MergeRequestsMilestoneIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171115164540_populate_merge_requests_latest_merge_request_diff_id_take_two.rb b/db/migrate/20171115164540_populate_merge_requests_latest_merge_request_diff_id_take_two.rb
index 27b6b4ebddc..935092ce46a 100644
--- a/db/migrate/20171115164540_populate_merge_requests_latest_merge_request_diff_id_take_two.rb
+++ b/db/migrate/20171115164540_populate_merge_requests_latest_merge_request_diff_id_take_two.rb
@@ -1,5 +1,5 @@
 # This is identical to the stolen background migration, which already has specs.
-class PopulateMergeRequestsLatestMergeRequestDiffIdTakeTwo < ActiveRecord::Migration
+class PopulateMergeRequestsLatestMergeRequestDiffIdTakeTwo < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171116135628_add_environment_scope_to_clusters.rb b/db/migrate/20171116135628_add_environment_scope_to_clusters.rb
index cce757095dd..39bb8759cc0 100644
--- a/db/migrate/20171116135628_add_environment_scope_to_clusters.rb
+++ b/db/migrate/20171116135628_add_environment_scope_to_clusters.rb
@@ -1,4 +1,4 @@
-class AddEnvironmentScopeToClusters < ActiveRecord::Migration
+class AddEnvironmentScopeToClusters < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171121135738_clean_up_from_merge_request_diffs_and_commits.rb b/db/migrate/20171121135738_clean_up_from_merge_request_diffs_and_commits.rb
index 30cf08b29fc..6be7b75492d 100644
--- a/db/migrate/20171121135738_clean_up_from_merge_request_diffs_and_commits.rb
+++ b/db/migrate/20171121135738_clean_up_from_merge_request_diffs_and_commits.rb
@@ -1,4 +1,4 @@
-class CleanUpFromMergeRequestDiffsAndCommits < ActiveRecord::Migration
+class CleanUpFromMergeRequestDiffsAndCommits < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171121144800_ci_pipelines_index_on_project_id_ref_status_id.rb b/db/migrate/20171121144800_ci_pipelines_index_on_project_id_ref_status_id.rb
index 5a8ae6e4b57..a1dcfc70650 100644
--- a/db/migrate/20171121144800_ci_pipelines_index_on_project_id_ref_status_id.rb
+++ b/db/migrate/20171121144800_ci_pipelines_index_on_project_id_ref_status_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CiPipelinesIndexOnProjectIdRefStatusId < ActiveRecord::Migration
+class CiPipelinesIndexOnProjectIdRefStatusId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171122131600_add_new_project_guidelines_to_appearances.rb b/db/migrate/20171122131600_add_new_project_guidelines_to_appearances.rb
index 328cc65a549..cbcbb5d988a 100644
--- a/db/migrate/20171122131600_add_new_project_guidelines_to_appearances.rb
+++ b/db/migrate/20171122131600_add_new_project_guidelines_to_appearances.rb
@@ -1,4 +1,4 @@
-class AddNewProjectGuidelinesToAppearances < ActiveRecord::Migration
+class AddNewProjectGuidelinesToAppearances < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171123094802_add_circuitbreaker_check_interval_to_application_settings.rb b/db/migrate/20171123094802_add_circuitbreaker_check_interval_to_application_settings.rb
index 213d46018fc..94360c64926 100644
--- a/db/migrate/20171123094802_add_circuitbreaker_check_interval_to_application_settings.rb
+++ b/db/migrate/20171123094802_add_circuitbreaker_check_interval_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddCircuitbreakerCheckIntervalToApplicationSettings < ActiveRecord::Migration
+class AddCircuitbreakerCheckIntervalToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171124125042_add_default_values_to_merge_request_states.rb b/db/migrate/20171124125042_add_default_values_to_merge_request_states.rb
index d08863c3b78..d0d06863777 100644
--- a/db/migrate/20171124125042_add_default_values_to_merge_request_states.rb
+++ b/db/migrate/20171124125042_add_default_values_to_merge_request_states.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddDefaultValuesToMergeRequestStates < ActiveRecord::Migration
+class AddDefaultValuesToMergeRequestStates < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171124125748_populate_missing_merge_request_statuses.rb b/db/migrate/20171124125748_populate_missing_merge_request_statuses.rb
index 72fbab59f4c..67444f36e24 100644
--- a/db/migrate/20171124125748_populate_missing_merge_request_statuses.rb
+++ b/db/migrate/20171124125748_populate_missing_merge_request_statuses.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PopulateMissingMergeRequestStatuses < ActiveRecord::Migration
+class PopulateMissingMergeRequestStatuses < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171124132536_make_merge_request_statuses_not_null.rb b/db/migrate/20171124132536_make_merge_request_statuses_not_null.rb
index 4bb09126036..49b693c5950 100644
--- a/db/migrate/20171124132536_make_merge_request_statuses_not_null.rb
+++ b/db/migrate/20171124132536_make_merge_request_statuses_not_null.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MakeMergeRequestStatusesNotNull < ActiveRecord::Migration
+class MakeMergeRequestStatusesNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171127151038_add_events_related_columns_to_merge_request_metrics.rb b/db/migrate/20171127151038_add_events_related_columns_to_merge_request_metrics.rb
index 18af697cf88..385de9dd73d 100644
--- a/db/migrate/20171127151038_add_events_related_columns_to_merge_request_metrics.rb
+++ b/db/migrate/20171127151038_add_events_related_columns_to_merge_request_metrics.rb
@@ -1,4 +1,4 @@
-class AddEventsRelatedColumnsToMergeRequestMetrics < ActiveRecord::Migration
+class AddEventsRelatedColumnsToMergeRequestMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171204204233_add_permanent_to_redirect_route.rb b/db/migrate/20171204204233_add_permanent_to_redirect_route.rb
index f3ae471201e..bc0658035d6 100644
--- a/db/migrate/20171204204233_add_permanent_to_redirect_route.rb
+++ b/db/migrate/20171204204233_add_permanent_to_redirect_route.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPermanentToRedirectRoute < ActiveRecord::Migration
+class AddPermanentToRedirectRoute < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20171206221519_add_permanent_index_to_redirect_route.rb b/db/migrate/20171206221519_add_permanent_index_to_redirect_route.rb
index 33ce7e1aa68..ba924c4eecc 100644
--- a/db/migrate/20171206221519_add_permanent_index_to_redirect_route.rb
+++ b/db/migrate/20171206221519_add_permanent_index_to_redirect_route.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPermanentIndexToRedirectRoute < ActiveRecord::Migration
+class AddPermanentIndexToRedirectRoute < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171207185153_add_merge_request_state_index.rb b/db/migrate/20171207185153_add_merge_request_state_index.rb
index 72f846c5c38..167470cf7fe 100644
--- a/db/migrate/20171207185153_add_merge_request_state_index.rb
+++ b/db/migrate/20171207185153_add_merge_request_state_index.rb
@@ -1,4 +1,4 @@
-class AddMergeRequestStateIndex < ActiveRecord::Migration
+class AddMergeRequestStateIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171211145425_add_can_push_to_deploy_keys_projects.rb b/db/migrate/20171211145425_add_can_push_to_deploy_keys_projects.rb
index 5dc723db9f9..63e86b23aad 100644
--- a/db/migrate/20171211145425_add_can_push_to_deploy_keys_projects.rb
+++ b/db/migrate/20171211145425_add_can_push_to_deploy_keys_projects.rb
@@ -1,4 +1,4 @@
-class AddCanPushToDeployKeysProjects < ActiveRecord::Migration
+class AddCanPushToDeployKeysProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171212203433_create_clusters_applications_prometheus.rb b/db/migrate/20171212203433_create_clusters_applications_prometheus.rb
index dc2531d2691..6eb9fec609e 100644
--- a/db/migrate/20171212203433_create_clusters_applications_prometheus.rb
+++ b/db/migrate/20171212203433_create_clusters_applications_prometheus.rb
@@ -1,4 +1,4 @@
-class CreateClustersApplicationsPrometheus < ActiveRecord::Migration
+class CreateClustersApplicationsPrometheus < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171214144320_add_store_column_to_uploads.rb b/db/migrate/20171214144320_add_store_column_to_uploads.rb
index e35798e2c41..11b3951a3fa 100644
--- a/db/migrate/20171214144320_add_store_column_to_uploads.rb
+++ b/db/migrate/20171214144320_add_store_column_to_uploads.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddStoreColumnToUploads < ActiveRecord::Migration
+class AddStoreColumnToUploads < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171215113714_populate_can_push_from_deploy_keys_projects.rb b/db/migrate/20171215113714_populate_can_push_from_deploy_keys_projects.rb
index 680855af945..e2d7879b140 100644
--- a/db/migrate/20171215113714_populate_can_push_from_deploy_keys_projects.rb
+++ b/db/migrate/20171215113714_populate_can_push_from_deploy_keys_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PopulateCanPushFromDeployKeysProjects < ActiveRecord::Migration
+class PopulateCanPushFromDeployKeysProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171216111734_clean_up_for_members.rb b/db/migrate/20171216111734_clean_up_for_members.rb
index 22e0997dce6..2fefc6c7fd1 100644
--- a/db/migrate/20171216111734_clean_up_for_members.rb
+++ b/db/migrate/20171216111734_clean_up_for_members.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanUpForMembers < ActiveRecord::Migration
+class CleanUpForMembers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171216112339_add_foreign_key_for_members.rb b/db/migrate/20171216112339_add_foreign_key_for_members.rb
index be17769be6a..06c2c5068da 100644
--- a/db/migrate/20171216112339_add_foreign_key_for_members.rb
+++ b/db/migrate/20171216112339_add_foreign_key_for_members.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddForeignKeyForMembers < ActiveRecord::Migration
+class AddForeignKeyForMembers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171220191323_add_index_on_namespaces_lower_name.rb b/db/migrate/20171220191323_add_index_on_namespaces_lower_name.rb
index 130b24fe6f0..7543e435941 100644
--- a/db/migrate/20171220191323_add_index_on_namespaces_lower_name.rb
+++ b/db/migrate/20171220191323_add_index_on_namespaces_lower_name.rb
@@ -1,4 +1,4 @@
-class AddIndexOnNamespacesLowerName < ActiveRecord::Migration
+class AddIndexOnNamespacesLowerName < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
   INDEX_NAME = 'index_on_namespaces_lower_name'
diff --git a/db/migrate/20171222115326_add_confidential_note_events_to_web_hooks.rb b/db/migrate/20171222115326_add_confidential_note_events_to_web_hooks.rb
index 900a6386922..788a842a3ad 100644
--- a/db/migrate/20171222115326_add_confidential_note_events_to_web_hooks.rb
+++ b/db/migrate/20171222115326_add_confidential_note_events_to_web_hooks.rb
@@ -1,4 +1,4 @@
-class AddConfidentialNoteEventsToWebHooks < ActiveRecord::Migration
+class AddConfidentialNoteEventsToWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20171222183504_add_jobs_cache_index_to_project.rb b/db/migrate/20171222183504_add_jobs_cache_index_to_project.rb
index 607e9d027d7..78a195c351c 100644
--- a/db/migrate/20171222183504_add_jobs_cache_index_to_project.rb
+++ b/db/migrate/20171222183504_add_jobs_cache_index_to_project.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddJobsCacheIndexToProject < ActiveRecord::Migration
+class AddJobsCacheIndexToProject < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171229225929_change_user_project_limit_not_null_and_remove_default.rb b/db/migrate/20171229225929_change_user_project_limit_not_null_and_remove_default.rb
index 54fbbcf1a0d..b9efdb8bb8f 100644
--- a/db/migrate/20171229225929_change_user_project_limit_not_null_and_remove_default.rb
+++ b/db/migrate/20171229225929_change_user_project_limit_not_null_and_remove_default.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ChangeUserProjectLimitNotNullAndRemoveDefault < ActiveRecord::Migration
+class ChangeUserProjectLimitNotNullAndRemoveDefault < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20171230123729_add_rebase_commit_sha_to_merge_requests_ce.rb b/db/migrate/20171230123729_add_rebase_commit_sha_to_merge_requests_ce.rb
index 94a7c1019d8..4e1107e1ff5 100644
--- a/db/migrate/20171230123729_add_rebase_commit_sha_to_merge_requests_ce.rb
+++ b/db/migrate/20171230123729_add_rebase_commit_sha_to_merge_requests_ce.rb
@@ -1,4 +1,4 @@
-class AddRebaseCommitShaToMergeRequestsCe < ActiveRecord::Migration
+class AddRebaseCommitShaToMergeRequestsCe < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20180101160629_create_prometheus_metrics.rb b/db/migrate/20180101160629_create_prometheus_metrics.rb
index c3be0939b17..e3b1ed710d6 100644
--- a/db/migrate/20180101160629_create_prometheus_metrics.rb
+++ b/db/migrate/20180101160629_create_prometheus_metrics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreatePrometheusMetrics < ActiveRecord::Migration
+class CreatePrometheusMetrics < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180101160630_change_project_id_for_prometheus_metrics.rb b/db/migrate/20180101160630_change_project_id_for_prometheus_metrics.rb
index 66820f13f54..d225899af18 100644
--- a/db/migrate/20180101160630_change_project_id_for_prometheus_metrics.rb
+++ b/db/migrate/20180101160630_change_project_id_for_prometheus_metrics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class ChangeProjectIdForPrometheusMetrics < ActiveRecord::Migration
+class ChangeProjectIdForPrometheusMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180102220145_add_pages_https_only_to_projects.rb b/db/migrate/20180102220145_add_pages_https_only_to_projects.rb
index ef6bc6896c0..75488f57fa9 100644
--- a/db/migrate/20180102220145_add_pages_https_only_to_projects.rb
+++ b/db/migrate/20180102220145_add_pages_https_only_to_projects.rb
@@ -1,4 +1,4 @@
-class AddPagesHttpsOnlyToProjects < ActiveRecord::Migration
+class AddPagesHttpsOnlyToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180103123548_add_confidential_note_events_to_services.rb b/db/migrate/20180103123548_add_confidential_note_events_to_services.rb
index b54ad88df43..02724575e6c 100644
--- a/db/migrate/20180103123548_add_confidential_note_events_to_services.rb
+++ b/db/migrate/20180103123548_add_confidential_note_events_to_services.rb
@@ -1,4 +1,4 @@
-class AddConfidentialNoteEventsToServices < ActiveRecord::Migration
+class AddConfidentialNoteEventsToServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180105212544_add_commits_count_to_merge_request_diff.rb b/db/migrate/20180105212544_add_commits_count_to_merge_request_diff.rb
index f942b4c062e..e27eecde906 100644
--- a/db/migrate/20180105212544_add_commits_count_to_merge_request_diff.rb
+++ b/db/migrate/20180105212544_add_commits_count_to_merge_request_diff.rb
@@ -1,4 +1,4 @@
-class AddCommitsCountToMergeRequestDiff < ActiveRecord::Migration
+class AddCommitsCountToMergeRequestDiff < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180109183319_change_default_value_for_pages_https_only.rb b/db/migrate/20180109183319_change_default_value_for_pages_https_only.rb
index c242e1b0d24..558eb60ac3f 100644
--- a/db/migrate/20180109183319_change_default_value_for_pages_https_only.rb
+++ b/db/migrate/20180109183319_change_default_value_for_pages_https_only.rb
@@ -1,4 +1,4 @@
-class ChangeDefaultValueForPagesHttpsOnly < ActiveRecord::Migration
+class ChangeDefaultValueForPagesHttpsOnly < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180113220114_rework_redirect_routes_indexes.rb b/db/migrate/20180113220114_rework_redirect_routes_indexes.rb
index 53f82a31203..4c3bb0a26ce 100644
--- a/db/migrate/20180113220114_rework_redirect_routes_indexes.rb
+++ b/db/migrate/20180113220114_rework_redirect_routes_indexes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ReworkRedirectRoutesIndexes < ActiveRecord::Migration
+class ReworkRedirectRoutesIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180115201419_add_index_updated_at_to_issues.rb b/db/migrate/20180115201419_add_index_updated_at_to_issues.rb
index a5a48fc97be..8707307eed0 100644
--- a/db/migrate/20180115201419_add_index_updated_at_to_issues.rb
+++ b/db/migrate/20180115201419_add_index_updated_at_to_issues.rb
@@ -1,4 +1,4 @@
-class AddIndexUpdatedAtToIssues < ActiveRecord::Migration
+class AddIndexUpdatedAtToIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180116193854_create_lfs_file_locks.rb b/db/migrate/20180116193854_create_lfs_file_locks.rb
index 23b0c90484b..2dd0e71916b 100644
--- a/db/migrate/20180116193854_create_lfs_file_locks.rb
+++ b/db/migrate/20180116193854_create_lfs_file_locks.rb
@@ -1,4 +1,4 @@
-class CreateLfsFileLocks < ActiveRecord::Migration
+class CreateLfsFileLocks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180119135717_add_uploader_index_to_uploads.rb b/db/migrate/20180119135717_add_uploader_index_to_uploads.rb
index a678c3d049f..7dd0a06e3bf 100644
--- a/db/migrate/20180119135717_add_uploader_index_to_uploads.rb
+++ b/db/migrate/20180119135717_add_uploader_index_to_uploads.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddUploaderIndexToUploads < ActiveRecord::Migration
+class AddUploaderIndexToUploads < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180119160751_optimize_ci_job_artifacts.rb b/db/migrate/20180119160751_optimize_ci_job_artifacts.rb
index 9b4340ed7b7..3598689d78c 100644
--- a/db/migrate/20180119160751_optimize_ci_job_artifacts.rb
+++ b/db/migrate/20180119160751_optimize_ci_job_artifacts.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class OptimizeCiJobArtifacts < ActiveRecord::Migration
+class OptimizeCiJobArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb b/db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb
index 7e16cb83087..c76dc5b3a68 100644
--- a/db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb
+++ b/db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddAutoDevopsDomainToApplicationSettings < ActiveRecord::Migration
+class AddAutoDevopsDomainToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180125214301_create_user_callouts.rb b/db/migrate/20180125214301_create_user_callouts.rb
index 856eff36ae0..6eb2f932ccc 100644
--- a/db/migrate/20180125214301_create_user_callouts.rb
+++ b/db/migrate/20180125214301_create_user_callouts.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CreateUserCallouts < ActiveRecord::Migration
+class CreateUserCallouts < ActiveRecord::Migration[4.2]
   # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
diff --git a/db/migrate/20180129193323_add_uploads_builder_context.rb b/db/migrate/20180129193323_add_uploads_builder_context.rb
index b3909a770ca..c7227bf0f1e 100644
--- a/db/migrate/20180129193323_add_uploads_builder_context.rb
+++ b/db/migrate/20180129193323_add_uploads_builder_context.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddUploadsBuilderContext < ActiveRecord::Migration
+class AddUploadsBuilderContext < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180201102129_add_unique_constraint_to_trending_projects_project_id.rb b/db/migrate/20180201102129_add_unique_constraint_to_trending_projects_project_id.rb
index 02e53b8fa8a..1f2a79d36a5 100644
--- a/db/migrate/20180201102129_add_unique_constraint_to_trending_projects_project_id.rb
+++ b/db/migrate/20180201102129_add_unique_constraint_to_trending_projects_project_id.rb
@@ -1,4 +1,4 @@
-class AddUniqueConstraintToTrendingProjectsProjectId < ActiveRecord::Migration
+class AddUniqueConstraintToTrendingProjectsProjectId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180201110056_add_foreign_keys_to_todos.rb b/db/migrate/20180201110056_add_foreign_keys_to_todos.rb
index 020b0550321..6b217632a52 100644
--- a/db/migrate/20180201110056_add_foreign_keys_to_todos.rb
+++ b/db/migrate/20180201110056_add_foreign_keys_to_todos.rb
@@ -1,4 +1,4 @@
-class AddForeignKeysToTodos < ActiveRecord::Migration
+class AddForeignKeysToTodos < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class Todo < ActiveRecord::Base
diff --git a/db/migrate/20180201145907_migrate_remaining_issues_closed_at.rb b/db/migrate/20180201145907_migrate_remaining_issues_closed_at.rb
index 36a85b61968..d398909f25b 100644
--- a/db/migrate/20180201145907_migrate_remaining_issues_closed_at.rb
+++ b/db/migrate/20180201145907_migrate_remaining_issues_closed_at.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateRemainingIssuesClosedAt < ActiveRecord::Migration
+class MigrateRemainingIssuesClosedAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180206200543_reset_events_primary_key_sequence.rb b/db/migrate/20180206200543_reset_events_primary_key_sequence.rb
index eb5c4a6a1e7..d395c5725e4 100644
--- a/db/migrate/20180206200543_reset_events_primary_key_sequence.rb
+++ b/db/migrate/20180206200543_reset_events_primary_key_sequence.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ResetEventsPrimaryKeySequence < ActiveRecord::Migration
+class ResetEventsPrimaryKeySequence < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180208183958_schedule_populate_untracked_uploads_if_needed.rb b/db/migrate/20180208183958_schedule_populate_untracked_uploads_if_needed.rb
index e46e793d9d2..b69ac8f94c1 100644
--- a/db/migrate/20180208183958_schedule_populate_untracked_uploads_if_needed.rb
+++ b/db/migrate/20180208183958_schedule_populate_untracked_uploads_if_needed.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class SchedulePopulateUntrackedUploadsIfNeeded < ActiveRecord::Migration
+class SchedulePopulateUntrackedUploadsIfNeeded < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180209165249_add_closed_by_to_issues.rb b/db/migrate/20180209165249_add_closed_by_to_issues.rb
index e251afd7b49..91a1e021ab9 100644
--- a/db/migrate/20180209165249_add_closed_by_to_issues.rb
+++ b/db/migrate/20180209165249_add_closed_by_to_issues.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddClosedByToIssues < ActiveRecord::Migration
+class AddClosedByToIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb b/db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb
index dbe09a43aa7..e2a9a68b1ad 100644
--- a/db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb
+++ b/db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb
@@ -1,4 +1,4 @@
-class AddExternalIpToClustersApplicationsIngress < ActiveRecord::Migration
+class AddExternalIpToClustersApplicationsIngress < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb b/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb
index cedf2510dda..905915d9239 100644
--- a/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb
+++ b/db/migrate/20180213131630_add_partial_index_to_projects_for_index_only_scans.rb
@@ -1,4 +1,4 @@
-class AddPartialIndexToProjectsForIndexOnlyScans < ActiveRecord::Migration
+class AddPartialIndexToProjectsForIndexOnlyScans < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180214093516_create_badges.rb b/db/migrate/20180214093516_create_badges.rb
index a1d77328f77..66e017b115a 100644
--- a/db/migrate/20180214093516_create_badges.rb
+++ b/db/migrate/20180214093516_create_badges.rb
@@ -1,4 +1,4 @@
-class CreateBadges < ActiveRecord::Migration
+class CreateBadges < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180214155405_create_clusters_applications_runners.rb b/db/migrate/20180214155405_create_clusters_applications_runners.rb
index fc4c0881338..ce594c91890 100644
--- a/db/migrate/20180214155405_create_clusters_applications_runners.rb
+++ b/db/migrate/20180214155405_create_clusters_applications_runners.rb
@@ -1,4 +1,4 @@
-class CreateClustersApplicationsRunners < ActiveRecord::Migration
+class CreateClustersApplicationsRunners < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180215181245_users_name_lower_index.rb b/db/migrate/20180215181245_users_name_lower_index.rb
index d3f68cb7d45..3b80601a727 100644
--- a/db/migrate/20180215181245_users_name_lower_index.rb
+++ b/db/migrate/20180215181245_users_name_lower_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class UsersNameLowerIndex < ActiveRecord::Migration
+class UsersNameLowerIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180216120000_add_pages_domain_verification.rb b/db/migrate/20180216120000_add_pages_domain_verification.rb
index 8b7cae92285..f709f5a5809 100644
--- a/db/migrate/20180216120000_add_pages_domain_verification.rb
+++ b/db/migrate/20180216120000_add_pages_domain_verification.rb
@@ -1,4 +1,4 @@
-class AddPagesDomainVerification < ActiveRecord::Migration
+class AddPagesDomainVerification < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180216120010_add_pages_domain_verified_at_index.rb b/db/migrate/20180216120010_add_pages_domain_verified_at_index.rb
index 825dfb52dce..6e7cb89c765 100644
--- a/db/migrate/20180216120010_add_pages_domain_verified_at_index.rb
+++ b/db/migrate/20180216120010_add_pages_domain_verified_at_index.rb
@@ -1,4 +1,4 @@
-class AddPagesDomainVerifiedAtIndex < ActiveRecord::Migration
+class AddPagesDomainVerifiedAtIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180216120020_allow_domain_verification_to_be_disabled.rb b/db/migrate/20180216120020_allow_domain_verification_to_be_disabled.rb
index 06d458028b3..18e4f534105 100644
--- a/db/migrate/20180216120020_allow_domain_verification_to_be_disabled.rb
+++ b/db/migrate/20180216120020_allow_domain_verification_to_be_disabled.rb
@@ -1,4 +1,4 @@
-class AllowDomainVerificationToBeDisabled < ActiveRecord::Migration
+class AllowDomainVerificationToBeDisabled < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180216120030_add_pages_domain_enabled_until.rb b/db/migrate/20180216120030_add_pages_domain_enabled_until.rb
index b40653044dd..3347bb6deaa 100644
--- a/db/migrate/20180216120030_add_pages_domain_enabled_until.rb
+++ b/db/migrate/20180216120030_add_pages_domain_enabled_until.rb
@@ -1,4 +1,4 @@
-class AddPagesDomainEnabledUntil < ActiveRecord::Migration
+class AddPagesDomainEnabledUntil < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180216120040_add_pages_domain_enabled_until_index.rb b/db/migrate/20180216120040_add_pages_domain_enabled_until_index.rb
index 00f6e4979da..3880a8ea139 100644
--- a/db/migrate/20180216120040_add_pages_domain_enabled_until_index.rb
+++ b/db/migrate/20180216120040_add_pages_domain_enabled_until_index.rb
@@ -1,4 +1,4 @@
-class AddPagesDomainEnabledUntilIndex < ActiveRecord::Migration
+class AddPagesDomainEnabledUntilIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180216120050_pages_domains_verification_grace_period.rb b/db/migrate/20180216120050_pages_domains_verification_grace_period.rb
index d7f8634b536..e51cff68b50 100644
--- a/db/migrate/20180216120050_pages_domains_verification_grace_period.rb
+++ b/db/migrate/20180216120050_pages_domains_verification_grace_period.rb
@@ -1,4 +1,4 @@
-class PagesDomainsVerificationGracePeriod < ActiveRecord::Migration
+class PagesDomainsVerificationGracePeriod < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   class PagesDomain < ActiveRecord::Base
diff --git a/db/migrate/20180219153455_add_maximum_timeout_to_ci_runners.rb b/db/migrate/20180219153455_add_maximum_timeout_to_ci_runners.rb
index 072e696a43e..68578c23207 100644
--- a/db/migrate/20180219153455_add_maximum_timeout_to_ci_runners.rb
+++ b/db/migrate/20180219153455_add_maximum_timeout_to_ci_runners.rb
@@ -1,4 +1,4 @@
-class AddMaximumTimeoutToCiRunners < ActiveRecord::Migration
+class AddMaximumTimeoutToCiRunners < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb b/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb
index 81acfbc3655..71f6bc46a88 100644
--- a/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb
+++ b/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddAllowMaintainerToPushToMergeRequests < ActiveRecord::Migration
+class AddAllowMaintainerToPushToMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180222043024_add_ip_address_to_runner.rb b/db/migrate/20180222043024_add_ip_address_to_runner.rb
index bf00560b5a8..b52366c0be1 100644
--- a/db/migrate/20180222043024_add_ip_address_to_runner.rb
+++ b/db/migrate/20180222043024_add_ip_address_to_runner.rb
@@ -1,4 +1,4 @@
-class AddIpAddressToRunner < ActiveRecord::Migration
+class AddIpAddressToRunner < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180223120443_create_user_interacted_projects_table.rb b/db/migrate/20180223120443_create_user_interacted_projects_table.rb
index 8da8cf68088..185a690ad3d 100644
--- a/db/migrate/20180223120443_create_user_interacted_projects_table.rb
+++ b/db/migrate/20180223120443_create_user_interacted_projects_table.rb
@@ -1,4 +1,4 @@
-class CreateUserInteractedProjectsTable < ActiveRecord::Migration
+class CreateUserInteractedProjectsTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180223144945_add_allow_local_requests_from_hooks_and_services_to_application_settings.rb b/db/migrate/20180223144945_add_allow_local_requests_from_hooks_and_services_to_application_settings.rb
index c994a54698b..3bd7d6fd827 100644
--- a/db/migrate/20180223144945_add_allow_local_requests_from_hooks_and_services_to_application_settings.rb
+++ b/db/migrate/20180223144945_add_allow_local_requests_from_hooks_and_services_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddAllowLocalRequestsFromHooksAndServicesToApplicationSettings < ActiveRecord::Migration
+class AddAllowLocalRequestsFromHooksAndServicesToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180226050030_add_checksum_to_ci_job_artifacts.rb b/db/migrate/20180226050030_add_checksum_to_ci_job_artifacts.rb
index 54e6e35449e..bccb7ac26ec 100644
--- a/db/migrate/20180226050030_add_checksum_to_ci_job_artifacts.rb
+++ b/db/migrate/20180226050030_add_checksum_to_ci_job_artifacts.rb
@@ -1,4 +1,4 @@
-class AddChecksumToCiJobArtifacts < ActiveRecord::Migration
+class AddChecksumToCiJobArtifacts < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180227182112_add_group_id_to_boards_ce.rb b/db/migrate/20180227182112_add_group_id_to_boards_ce.rb
index 5b2691b3a00..b887be0cc55 100644
--- a/db/migrate/20180227182112_add_group_id_to_boards_ce.rb
+++ b/db/migrate/20180227182112_add_group_id_to_boards_ce.rb
@@ -1,4 +1,4 @@
-class AddGroupIdToBoardsCe < ActiveRecord::Migration
+class AddGroupIdToBoardsCe < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/migrate/20180228172924_add_include_private_contributions_to_users.rb b/db/migrate/20180228172924_add_include_private_contributions_to_users.rb
index ea3ebdd83d1..7921d3a14b6 100644
--- a/db/migrate/20180228172924_add_include_private_contributions_to_users.rb
+++ b/db/migrate/20180228172924_add_include_private_contributions_to_users.rb
@@ -1,4 +1,4 @@
-class AddIncludePrivateContributionsToUsers < ActiveRecord::Migration
+class AddIncludePrivateContributionsToUsers < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180301010859_create_ci_builds_metadata_table.rb b/db/migrate/20180301010859_create_ci_builds_metadata_table.rb
index ce737444092..29652c675e1 100644
--- a/db/migrate/20180301010859_create_ci_builds_metadata_table.rb
+++ b/db/migrate/20180301010859_create_ci_builds_metadata_table.rb
@@ -1,4 +1,4 @@
-class CreateCiBuildsMetadataTable < ActiveRecord::Migration
+class CreateCiBuildsMetadataTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180302152117_ensure_foreign_keys_on_clusters_applications.rb b/db/migrate/20180302152117_ensure_foreign_keys_on_clusters_applications.rb
index e6cec39e61f..d660c7cfd2d 100644
--- a/db/migrate/20180302152117_ensure_foreign_keys_on_clusters_applications.rb
+++ b/db/migrate/20180302152117_ensure_foreign_keys_on_clusters_applications.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class EnsureForeignKeysOnClustersApplications < ActiveRecord::Migration
+class EnsureForeignKeysOnClustersApplications < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180305095250_create_internal_ids_table.rb b/db/migrate/20180305095250_create_internal_ids_table.rb
index 432086fe98b..8565f5d848b 100644
--- a/db/migrate/20180305095250_create_internal_ids_table.rb
+++ b/db/migrate/20180305095250_create_internal_ids_table.rb
@@ -1,4 +1,4 @@
-class CreateInternalIdsTable < ActiveRecord::Migration
+class CreateInternalIdsTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180305144721_add_privileged_to_runner.rb b/db/migrate/20180305144721_add_privileged_to_runner.rb
index 32e73dba8d5..359498bf9b0 100644
--- a/db/migrate/20180305144721_add_privileged_to_runner.rb
+++ b/db/migrate/20180305144721_add_privileged_to_runner.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPrivilegedToRunner < ActiveRecord::Migration
+class AddPrivilegedToRunner < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180306134842_add_missing_indexes_acts_as_taggable_on_engine.rb b/db/migrate/20180306134842_add_missing_indexes_acts_as_taggable_on_engine.rb
index 06e402adcd7..b400ff94dbe 100644
--- a/db/migrate/20180306134842_add_missing_indexes_acts_as_taggable_on_engine.rb
+++ b/db/migrate/20180306134842_add_missing_indexes_acts_as_taggable_on_engine.rb
@@ -2,7 +2,7 @@
 #
 # It has been modified to handle no-downtime GitLab migrations. Several
 # indexes have been removed since they are not needed for GitLab.
-class AddMissingIndexesActsAsTaggableOnEngine < ActiveRecord::Migration
+class AddMissingIndexesActsAsTaggableOnEngine < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180308052825_add_section_name_id_index_on_ci_build_trace_sections.rb b/db/migrate/20180308052825_add_section_name_id_index_on_ci_build_trace_sections.rb
index b616cc2fd30..4d2ab7d757f 100644
--- a/db/migrate/20180308052825_add_section_name_id_index_on_ci_build_trace_sections.rb
+++ b/db/migrate/20180308052825_add_section_name_id_index_on_ci_build_trace_sections.rb
@@ -1,4 +1,4 @@
-class AddSectionNameIdIndexOnCiBuildTraceSections < ActiveRecord::Migration
+class AddSectionNameIdIndexOnCiBuildTraceSections < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb b/db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb
index fe50e909563..5e4bf96f86f 100644
--- a/db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb
+++ b/db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb
@@ -1,4 +1,4 @@
-class AddUserInternalRegexToApplicationSetting < ActiveRecord::Migration
+class AddUserInternalRegexToApplicationSetting < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180309121820_reschedule_commits_count_for_merge_request_diff.rb b/db/migrate/20180309121820_reschedule_commits_count_for_merge_request_diff.rb
index 990759104b0..ecb06dd4312 100644
--- a/db/migrate/20180309121820_reschedule_commits_count_for_merge_request_diff.rb
+++ b/db/migrate/20180309121820_reschedule_commits_count_for_merge_request_diff.rb
@@ -1,4 +1,4 @@
-class RescheduleCommitsCountForMergeRequestDiff < ActiveRecord::Migration
+class RescheduleCommitsCountForMergeRequestDiff < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180309160427_add_partial_indexes_on_todos.rb b/db/migrate/20180309160427_add_partial_indexes_on_todos.rb
index 671fa743cec..c22ed0a5177 100644
--- a/db/migrate/20180309160427_add_partial_indexes_on_todos.rb
+++ b/db/migrate/20180309160427_add_partial_indexes_on_todos.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPartialIndexesOnTodos < ActiveRecord::Migration
+class AddPartialIndexesOnTodos < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180319190020_create_deploy_tokens.rb b/db/migrate/20180319190020_create_deploy_tokens.rb
index d129459ea0a..a4d797679c5 100644
--- a/db/migrate/20180319190020_create_deploy_tokens.rb
+++ b/db/migrate/20180319190020_create_deploy_tokens.rb
@@ -1,4 +1,4 @@
-class CreateDeployTokens < ActiveRecord::Migration
+class CreateDeployTokens < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180320182229_add_indexes_for_user_activity_queries.rb b/db/migrate/20180320182229_add_indexes_for_user_activity_queries.rb
index 824bbb3ac05..a15e1d68a95 100644
--- a/db/migrate/20180320182229_add_indexes_for_user_activity_queries.rb
+++ b/db/migrate/20180320182229_add_indexes_for_user_activity_queries.rb
@@ -1,4 +1,4 @@
-class AddIndexesForUserActivityQueries < ActiveRecord::Migration
+class AddIndexesForUserActivityQueries < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180323150945_add_push_to_merge_request_to_notification_settings.rb b/db/migrate/20180323150945_add_push_to_merge_request_to_notification_settings.rb
index 12b8875d8dc..3b38d21a8aa 100644
--- a/db/migrate/20180323150945_add_push_to_merge_request_to_notification_settings.rb
+++ b/db/migrate/20180323150945_add_push_to_merge_request_to_notification_settings.rb
@@ -1,4 +1,4 @@
-class AddPushToMergeRequestToNotificationSettings < ActiveRecord::Migration
+class AddPushToMergeRequestToNotificationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180326202229_create_ci_build_trace_chunks.rb b/db/migrate/20180326202229_create_ci_build_trace_chunks.rb
index fb3f5786e85..45a64ec23d1 100644
--- a/db/migrate/20180326202229_create_ci_build_trace_chunks.rb
+++ b/db/migrate/20180326202229_create_ci_build_trace_chunks.rb
@@ -1,4 +1,4 @@
-class CreateCiBuildTraceChunks < ActiveRecord::Migration
+class CreateCiBuildTraceChunks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180327101207_remove_index_from_events_table.rb b/db/migrate/20180327101207_remove_index_from_events_table.rb
index 172441da65b..0583a2641ec 100644
--- a/db/migrate/20180327101207_remove_index_from_events_table.rb
+++ b/db/migrate/20180327101207_remove_index_from_events_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveIndexFromEventsTable < ActiveRecord::Migration
+class RemoveIndexFromEventsTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180330121048_add_issue_due_to_notification_settings.rb b/db/migrate/20180330121048_add_issue_due_to_notification_settings.rb
index c64a481fcf0..2d9ca002872 100644
--- a/db/migrate/20180330121048_add_issue_due_to_notification_settings.rb
+++ b/db/migrate/20180330121048_add_issue_due_to_notification_settings.rb
@@ -1,4 +1,4 @@
-class AddIssueDueToNotificationSettings < ActiveRecord::Migration
+class AddIssueDueToNotificationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180403035759_create_project_ci_cd_settings.rb b/db/migrate/20180403035759_create_project_ci_cd_settings.rb
index 173e662cffc..00028689779 100644
--- a/db/migrate/20180403035759_create_project_ci_cd_settings.rb
+++ b/db/migrate/20180403035759_create_project_ci_cd_settings.rb
@@ -1,4 +1,4 @@
-class CreateProjectCiCdSettings < ActiveRecord::Migration
+class CreateProjectCiCdSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180405142733_create_project_deploy_tokens.rb b/db/migrate/20180405142733_create_project_deploy_tokens.rb
index 9d8f89243a8..ba000492247 100644
--- a/db/migrate/20180405142733_create_project_deploy_tokens.rb
+++ b/db/migrate/20180405142733_create_project_deploy_tokens.rb
@@ -1,4 +1,4 @@
-class CreateProjectDeployTokens < ActiveRecord::Migration
+class CreateProjectDeployTokens < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180406204716_add_limits_ci_build_trace_chunks_raw_data_for_mysql.rb b/db/migrate/20180406204716_add_limits_ci_build_trace_chunks_raw_data_for_mysql.rb
index 0f2734853e6..0b541e94353 100644
--- a/db/migrate/20180406204716_add_limits_ci_build_trace_chunks_raw_data_for_mysql.rb
+++ b/db/migrate/20180406204716_add_limits_ci_build_trace_chunks_raw_data_for_mysql.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 require Rails.root.join('db/migrate/limits_ci_build_trace_chunks_raw_data_for_mysql')
 
-class AddLimitsCiBuildTraceChunksRawDataForMysql < ActiveRecord::Migration
+class AddLimitsCiBuildTraceChunksRawDataForMysql < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180408143354_rename_users_rss_token_to_feed_token.rb b/db/migrate/20180408143354_rename_users_rss_token_to_feed_token.rb
index e852d50b25e..4b8844a134d 100644
--- a/db/migrate/20180408143354_rename_users_rss_token_to_feed_token.rb
+++ b/db/migrate/20180408143354_rename_users_rss_token_to_feed_token.rb
@@ -1,4 +1,4 @@
-class RenameUsersRssTokenToFeedToken < ActiveRecord::Migration
+class RenameUsersRssTokenToFeedToken < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180413022611_create_missing_namespace_for_internal_users.rb b/db/migrate/20180413022611_create_missing_namespace_for_internal_users.rb
index b7b346cb10e..90d869a8c10 100644
--- a/db/migrate/20180413022611_create_missing_namespace_for_internal_users.rb
+++ b/db/migrate/20180413022611_create_missing_namespace_for_internal_users.rb
@@ -1,4 +1,4 @@
-class CreateMissingNamespaceForInternalUsers < ActiveRecord::Migration
+class CreateMissingNamespaceForInternalUsers < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20180416155103_add_further_scope_columns_to_internal_id_table.rb b/db/migrate/20180416155103_add_further_scope_columns_to_internal_id_table.rb
index 37e2d19e022..7c28cbb6795 100644
--- a/db/migrate/20180416155103_add_further_scope_columns_to_internal_id_table.rb
+++ b/db/migrate/20180416155103_add_further_scope_columns_to_internal_id_table.rb
@@ -1,4 +1,4 @@
-class AddFurtherScopeColumnsToInternalIdTable < ActiveRecord::Migration
+class AddFurtherScopeColumnsToInternalIdTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180417090132_add_index_constraints_to_internal_id_table.rb b/db/migrate/20180417090132_add_index_constraints_to_internal_id_table.rb
index 58de795472a..ac6bb1a8cab 100644
--- a/db/migrate/20180417090132_add_index_constraints_to_internal_id_table.rb
+++ b/db/migrate/20180417090132_add_index_constraints_to_internal_id_table.rb
@@ -1,4 +1,4 @@
-class AddIndexConstraintsToInternalIdTable < ActiveRecord::Migration
+class AddIndexConstraintsToInternalIdTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180417101040_add_tmp_stage_priority_index_to_ci_builds.rb b/db/migrate/20180417101040_add_tmp_stage_priority_index_to_ci_builds.rb
index ee82c70ecf8..ce470884999 100644
--- a/db/migrate/20180417101040_add_tmp_stage_priority_index_to_ci_builds.rb
+++ b/db/migrate/20180417101040_add_tmp_stage_priority_index_to_ci_builds.rb
@@ -1,4 +1,4 @@
-class AddTmpStagePriorityIndexToCiBuilds < ActiveRecord::Migration
+class AddTmpStagePriorityIndexToCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180417101940_add_index_to_ci_stage.rb b/db/migrate/20180417101940_add_index_to_ci_stage.rb
index 9dac78db774..97a8f5efce0 100644
--- a/db/migrate/20180417101940_add_index_to_ci_stage.rb
+++ b/db/migrate/20180417101940_add_index_to_ci_stage.rb
@@ -1,4 +1,4 @@
-class AddIndexToCiStage < ActiveRecord::Migration
+class AddIndexToCiStage < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180418053107_add_index_to_ci_job_artifacts_file_store.rb b/db/migrate/20180418053107_add_index_to_ci_job_artifacts_file_store.rb
index ac91624c3d5..4b574923483 100644
--- a/db/migrate/20180418053107_add_index_to_ci_job_artifacts_file_store.rb
+++ b/db/migrate/20180418053107_add_index_to_ci_job_artifacts_file_store.rb
@@ -1,4 +1,4 @@
-class AddIndexToCiJobArtifactsFileStore < ActiveRecord::Migration
+class AddIndexToCiJobArtifactsFileStore < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180420010016_add_pipeline_build_foreign_key.rb b/db/migrate/20180420010016_add_pipeline_build_foreign_key.rb
index 6fabe07bc9c..90a908feaee 100644
--- a/db/migrate/20180420010016_add_pipeline_build_foreign_key.rb
+++ b/db/migrate/20180420010016_add_pipeline_build_foreign_key.rb
@@ -1,4 +1,4 @@
-class AddPipelineBuildForeignKey < ActiveRecord::Migration
+class AddPipelineBuildForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180420010616_cleanup_build_stage_migration.rb b/db/migrate/20180420010616_cleanup_build_stage_migration.rb
index 5e9fe756efd..30c0d97781d 100644
--- a/db/migrate/20180420010616_cleanup_build_stage_migration.rb
+++ b/db/migrate/20180420010616_cleanup_build_stage_migration.rb
@@ -1,4 +1,4 @@
-class CleanupBuildStageMigration < ActiveRecord::Migration
+class CleanupBuildStageMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180423204600_add_pages_access_level_to_project_feature.rb b/db/migrate/20180423204600_add_pages_access_level_to_project_feature.rb
index 1d2f8cf9c76..0c536f917ce 100644
--- a/db/migrate/20180423204600_add_pages_access_level_to_project_feature.rb
+++ b/db/migrate/20180423204600_add_pages_access_level_to_project_feature.rb
@@ -1,4 +1,4 @@
-class AddPagesAccessLevelToProjectFeature < ActiveRecord::Migration
+class AddPagesAccessLevelToProjectFeature < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20180424090541_add_enforce_terms_to_application_settings.rb b/db/migrate/20180424090541_add_enforce_terms_to_application_settings.rb
index f5afdb0e4e6..b8fd71002a1 100644
--- a/db/migrate/20180424090541_add_enforce_terms_to_application_settings.rb
+++ b/db/migrate/20180424090541_add_enforce_terms_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddEnforceTermsToApplicationSettings < ActiveRecord::Migration
+class AddEnforceTermsToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180424134533_create_application_setting_terms.rb b/db/migrate/20180424134533_create_application_setting_terms.rb
index f29335cfc51..8741f20daeb 100644
--- a/db/migrate/20180424134533_create_application_setting_terms.rb
+++ b/db/migrate/20180424134533_create_application_setting_terms.rb
@@ -1,4 +1,4 @@
-class CreateApplicationSettingTerms < ActiveRecord::Migration
+class CreateApplicationSettingTerms < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb b/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb
index e8f0c91d612..550b5a2c149 100644
--- a/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb
+++ b/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb
@@ -1,4 +1,4 @@
-class AddPipelineIidToCiPipelines < ActiveRecord::Migration
+class AddPipelineIidToCiPipelines < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180425075446_create_term_agreements.rb b/db/migrate/20180425075446_create_term_agreements.rb
index 1fa2c8dd3be..25182215841 100644
--- a/db/migrate/20180425075446_create_term_agreements.rb
+++ b/db/migrate/20180425075446_create_term_agreements.rb
@@ -1,4 +1,4 @@
-class CreateTermAgreements < ActiveRecord::Migration
+class CreateTermAgreements < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180425131009_assure_commits_count_for_merge_request_diff.rb b/db/migrate/20180425131009_assure_commits_count_for_merge_request_diff.rb
index 0e991c23bfa..7d38a15b850 100644
--- a/db/migrate/20180425131009_assure_commits_count_for_merge_request_diff.rb
+++ b/db/migrate/20180425131009_assure_commits_count_for_merge_request_diff.rb
@@ -1,4 +1,4 @@
-class AssureCommitsCountForMergeRequestDiff < ActiveRecord::Migration
+class AssureCommitsCountForMergeRequestDiff < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb b/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb
index 3fa59b44d5d..8a0cb7ae4e4 100644
--- a/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb
+++ b/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb
@@ -1,4 +1,4 @@
-class AddIndexConstraintsToPipelineIid < ActiveRecord::Migration
+class AddIndexConstraintsToPipelineIid < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180426102016_add_accepted_term_to_users.rb b/db/migrate/20180426102016_add_accepted_term_to_users.rb
index 3d446f66214..3c6665b4264 100644
--- a/db/migrate/20180426102016_add_accepted_term_to_users.rb
+++ b/db/migrate/20180426102016_add_accepted_term_to_users.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddAcceptedTermToUsers < ActiveRecord::Migration
+class AddAcceptedTermToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180430101916_add_runner_type_to_ci_runners.rb b/db/migrate/20180430101916_add_runner_type_to_ci_runners.rb
index 42409349b75..a74231e0f44 100644
--- a/db/migrate/20180430101916_add_runner_type_to_ci_runners.rb
+++ b/db/migrate/20180430101916_add_runner_type_to_ci_runners.rb
@@ -1,4 +1,4 @@
-class AddRunnerTypeToCiRunners < ActiveRecord::Migration
+class AddRunnerTypeToCiRunners < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180502122856_create_project_mirror_data.rb b/db/migrate/20180502122856_create_project_mirror_data.rb
index d449f944844..8bc114afc0c 100644
--- a/db/migrate/20180502122856_create_project_mirror_data.rb
+++ b/db/migrate/20180502122856_create_project_mirror_data.rb
@@ -1,4 +1,4 @@
-class CreateProjectMirrorData < ActiveRecord::Migration
+class CreateProjectMirrorData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503131624_create_remote_mirrors.rb b/db/migrate/20180503131624_create_remote_mirrors.rb
index 249882f8613..9f4bd463e66 100644
--- a/db/migrate/20180503131624_create_remote_mirrors.rb
+++ b/db/migrate/20180503131624_create_remote_mirrors.rb
@@ -1,4 +1,4 @@
-class CreateRemoteMirrors < ActiveRecord::Migration
+class CreateRemoteMirrors < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503141722_add_remote_mirror_available_overridden_to_projects.rb b/db/migrate/20180503141722_add_remote_mirror_available_overridden_to_projects.rb
index 841393971f4..5e2ef5706ee 100644
--- a/db/migrate/20180503141722_add_remote_mirror_available_overridden_to_projects.rb
+++ b/db/migrate/20180503141722_add_remote_mirror_available_overridden_to_projects.rb
@@ -1,4 +1,4 @@
-class AddRemoteMirrorAvailableOverriddenToProjects < ActiveRecord::Migration
+class AddRemoteMirrorAvailableOverriddenToProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503150427_add_index_to_namespaces_runners_token.rb b/db/migrate/20180503150427_add_index_to_namespaces_runners_token.rb
index 9e55690bd33..899e4a05cbd 100644
--- a/db/migrate/20180503150427_add_index_to_namespaces_runners_token.rb
+++ b/db/migrate/20180503150427_add_index_to_namespaces_runners_token.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexToNamespacesRunnersToken < ActiveRecord::Migration
+class AddIndexToNamespacesRunnersToken < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb b/db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb
index 970a53d68d0..3775b3a08c9 100644
--- a/db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb
+++ b/db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb
@@ -1,4 +1,4 @@
-class EnsureMissingColumnsToProjectMirrorData < ActiveRecord::Migration
+class EnsureMissingColumnsToProjectMirrorData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503175054_add_indexes_to_project_mirror_data.rb b/db/migrate/20180503175054_add_indexes_to_project_mirror_data.rb
index b59b941c815..15a188594b0 100644
--- a/db/migrate/20180503175054_add_indexes_to_project_mirror_data.rb
+++ b/db/migrate/20180503175054_add_indexes_to_project_mirror_data.rb
@@ -1,4 +1,4 @@
-class AddIndexesToProjectMirrorData < ActiveRecord::Migration
+class AddIndexesToProjectMirrorData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503193542_add_indexes_to_remote_mirror.rb b/db/migrate/20180503193542_add_indexes_to_remote_mirror.rb
index 4af42b4fb29..bdf05c4e69b 100644
--- a/db/migrate/20180503193542_add_indexes_to_remote_mirror.rb
+++ b/db/migrate/20180503193542_add_indexes_to_remote_mirror.rb
@@ -1,4 +1,4 @@
-class AddIndexesToRemoteMirror < ActiveRecord::Migration
+class AddIndexesToRemoteMirror < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503193953_add_mirror_available_to_application_settings.rb b/db/migrate/20180503193953_add_mirror_available_to_application_settings.rb
index 25b9905b1a9..64f65cd23be 100644
--- a/db/migrate/20180503193953_add_mirror_available_to_application_settings.rb
+++ b/db/migrate/20180503193953_add_mirror_available_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddMirrorAvailableToApplicationSettings < ActiveRecord::Migration
+class AddMirrorAvailableToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180503200320_enable_prometheus_metrics_by_default.rb b/db/migrate/20180503200320_enable_prometheus_metrics_by_default.rb
index 2c8f86ff0f4..bab3b178713 100644
--- a/db/migrate/20180503200320_enable_prometheus_metrics_by_default.rb
+++ b/db/migrate/20180503200320_enable_prometheus_metrics_by_default.rb
@@ -1,4 +1,4 @@
-class EnablePrometheusMetricsByDefault < ActiveRecord::Migration
+class EnablePrometheusMetricsByDefault < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20180504195842_project_name_lower_index.rb b/db/migrate/20180504195842_project_name_lower_index.rb
index 74f3673bb03..3fe90c3fbb1 100644
--- a/db/migrate/20180504195842_project_name_lower_index.rb
+++ b/db/migrate/20180504195842_project_name_lower_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ProjectNameLowerIndex < ActiveRecord::Migration
+class ProjectNameLowerIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180508055821_make_remote_mirrors_disabled_by_default.rb b/db/migrate/20180508055821_make_remote_mirrors_disabled_by_default.rb
index 0d8a8357a1e..81aa18c8b86 100644
--- a/db/migrate/20180508055821_make_remote_mirrors_disabled_by_default.rb
+++ b/db/migrate/20180508055821_make_remote_mirrors_disabled_by_default.rb
@@ -1,4 +1,4 @@
-class MakeRemoteMirrorsDisabledByDefault < ActiveRecord::Migration
+class MakeRemoteMirrorsDisabledByDefault < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/20180508100222_add_not_null_constraint_to_project_mirror_data_foreign_key.rb b/db/migrate/20180508100222_add_not_null_constraint_to_project_mirror_data_foreign_key.rb
index 82087d15ccb..dba5d20f276 100644
--- a/db/migrate/20180508100222_add_not_null_constraint_to_project_mirror_data_foreign_key.rb
+++ b/db/migrate/20180508100222_add_not_null_constraint_to_project_mirror_data_foreign_key.rb
@@ -1,4 +1,4 @@
-class AddNotNullConstraintToProjectMirrorDataForeignKey < ActiveRecord::Migration
+class AddNotNullConstraintToProjectMirrorDataForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180508102840_add_unique_constraint_to_project_mirror_data_project_id_index.rb b/db/migrate/20180508102840_add_unique_constraint_to_project_mirror_data_project_id_index.rb
index acb976b52fa..b225354ca43 100644
--- a/db/migrate/20180508102840_add_unique_constraint_to_project_mirror_data_project_id_index.rb
+++ b/db/migrate/20180508102840_add_unique_constraint_to_project_mirror_data_project_id_index.rb
@@ -1,4 +1,4 @@
-class AddUniqueConstraintToProjectMirrorDataProjectIdIndex < ActiveRecord::Migration
+class AddUniqueConstraintToProjectMirrorDataProjectIdIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180508135515_set_runner_type_not_null.rb b/db/migrate/20180508135515_set_runner_type_not_null.rb
index dd043ec7179..00c546c8f47 100644
--- a/db/migrate/20180508135515_set_runner_type_not_null.rb
+++ b/db/migrate/20180508135515_set_runner_type_not_null.rb
@@ -1,4 +1,4 @@
-class SetRunnerTypeNotNull < ActiveRecord::Migration
+class SetRunnerTypeNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180511090724_add_index_on_ci_runners_runner_type.rb b/db/migrate/20180511090724_add_index_on_ci_runners_runner_type.rb
index f3ed20fd243..4913b8602c9 100644
--- a/db/migrate/20180511090724_add_index_on_ci_runners_runner_type.rb
+++ b/db/migrate/20180511090724_add_index_on_ci_runners_runner_type.rb
@@ -1,4 +1,4 @@
-class AddIndexOnCiRunnersRunnerType < ActiveRecord::Migration
+class AddIndexOnCiRunnersRunnerType < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180511131058_create_clusters_applications_jupyter.rb b/db/migrate/20180511131058_create_clusters_applications_jupyter.rb
index f3923884e37..749aeeb4792 100644
--- a/db/migrate/20180511131058_create_clusters_applications_jupyter.rb
+++ b/db/migrate/20180511131058_create_clusters_applications_jupyter.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CreateClustersApplicationsJupyter < ActiveRecord::Migration
+class CreateClustersApplicationsJupyter < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180515005612_add_squash_to_merge_requests.rb b/db/migrate/20180515005612_add_squash_to_merge_requests.rb
index fd85e968acd..14636d6fd8e 100644
--- a/db/migrate/20180515005612_add_squash_to_merge_requests.rb
+++ b/db/migrate/20180515005612_add_squash_to_merge_requests.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddSquashToMergeRequests < ActiveRecord::Migration
+class AddSquashToMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/migrate/20180515121227_create_notes_diff_files.rb b/db/migrate/20180515121227_create_notes_diff_files.rb
index efcd3bb9c7e..e50324d8599 100644
--- a/db/migrate/20180515121227_create_notes_diff_files.rb
+++ b/db/migrate/20180515121227_create_notes_diff_files.rb
@@ -1,4 +1,4 @@
-class CreateNotesDiffFiles < ActiveRecord::Migration
+class CreateNotesDiffFiles < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   disable_ddl_transaction!
diff --git a/db/migrate/20180517082340_add_not_null_constraints_to_project_authorizations.rb b/db/migrate/20180517082340_add_not_null_constraints_to_project_authorizations.rb
index 3b7b877232b..36f4770ff32 100644
--- a/db/migrate/20180517082340_add_not_null_constraints_to_project_authorizations.rb
+++ b/db/migrate/20180517082340_add_not_null_constraints_to_project_authorizations.rb
@@ -1,4 +1,4 @@
-class AddNotNullConstraintsToProjectAuthorizations < ActiveRecord::Migration
+class AddNotNullConstraintsToProjectAuthorizations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180523042841_rename_merge_requests_allow_maintainer_to_push.rb b/db/migrate/20180523042841_rename_merge_requests_allow_maintainer_to_push.rb
index 41bc7b71694..131dca1fbc2 100644
--- a/db/migrate/20180523042841_rename_merge_requests_allow_maintainer_to_push.rb
+++ b/db/migrate/20180523042841_rename_merge_requests_allow_maintainer_to_push.rb
@@ -1,4 +1,4 @@
-class RenameMergeRequestsAllowMaintainerToPush < ActiveRecord::Migration
+class RenameMergeRequestsAllowMaintainerToPush < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180524132016_merge_requests_target_id_iid_state_partial_index.rb b/db/migrate/20180524132016_merge_requests_target_id_iid_state_partial_index.rb
index cee576b91c8..bff4690427e 100644
--- a/db/migrate/20180524132016_merge_requests_target_id_iid_state_partial_index.rb
+++ b/db/migrate/20180524132016_merge_requests_target_id_iid_state_partial_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeRequestsTargetIdIidStatePartialIndex < ActiveRecord::Migration
+class MergeRequestsTargetIdIidStatePartialIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180529093006_ensure_remote_mirror_columns.rb b/db/migrate/20180529093006_ensure_remote_mirror_columns.rb
index 22e9482cb1d..207e1f089fb 100644
--- a/db/migrate/20180529093006_ensure_remote_mirror_columns.rb
+++ b/db/migrate/20180529093006_ensure_remote_mirror_columns.rb
@@ -1,4 +1,4 @@
-class EnsureRemoteMirrorColumns < ActiveRecord::Migration
+class EnsureRemoteMirrorColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180530135500_add_index_to_stages_position.rb b/db/migrate/20180530135500_add_index_to_stages_position.rb
index 61150f33a25..eabf94ab8ec 100644
--- a/db/migrate/20180530135500_add_index_to_stages_position.rb
+++ b/db/migrate/20180530135500_add_index_to_stages_position.rb
@@ -1,4 +1,4 @@
-class AddIndexToStagesPosition < ActiveRecord::Migration
+class AddIndexToStagesPosition < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180531185349_add_repository_languages.rb b/db/migrate/20180531185349_add_repository_languages.rb
index bfcfb618c87..26a01c3bb26 100644
--- a/db/migrate/20180531185349_add_repository_languages.rb
+++ b/db/migrate/20180531185349_add_repository_languages.rb
@@ -1,4 +1,4 @@
-class AddRepositoryLanguages < ActiveRecord::Migration
+class AddRepositoryLanguages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180531220618_change_default_value_for_dsa_key_restriction.rb b/db/migrate/20180531220618_change_default_value_for_dsa_key_restriction.rb
index dbbbcd1f622..cf621c46f2b 100644
--- a/db/migrate/20180531220618_change_default_value_for_dsa_key_restriction.rb
+++ b/db/migrate/20180531220618_change_default_value_for_dsa_key_restriction.rb
@@ -1,4 +1,4 @@
-class ChangeDefaultValueForDsaKeyRestriction < ActiveRecord::Migration
+class ChangeDefaultValueForDsaKeyRestriction < ActiveRecord::Migration[4.2]
   # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
diff --git a/db/migrate/20180601213245_add_deploy_strategy_to_project_auto_devops.rb b/db/migrate/20180601213245_add_deploy_strategy_to_project_auto_devops.rb
index 6f50d428965..78a3617ec93 100644
--- a/db/migrate/20180601213245_add_deploy_strategy_to_project_auto_devops.rb
+++ b/db/migrate/20180601213245_add_deploy_strategy_to_project_auto_devops.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddDeployStrategyToProjectAutoDevops < ActiveRecord::Migration
+class AddDeployStrategyToProjectAutoDevops < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180607071808_add_push_events_branch_filter_to_web_hooks.rb b/db/migrate/20180607071808_add_push_events_branch_filter_to_web_hooks.rb
index 6a69460e611..e6a1daaffc2 100644
--- a/db/migrate/20180607071808_add_push_events_branch_filter_to_web_hooks.rb
+++ b/db/migrate/20180607071808_add_push_events_branch_filter_to_web_hooks.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPushEventsBranchFilterToWebHooks < ActiveRecord::Migration
+class AddPushEventsBranchFilterToWebHooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180608091413_add_group_to_todos.rb b/db/migrate/20180608091413_add_group_to_todos.rb
index 20ba4849057..7f8efd78c59 100644
--- a/db/migrate/20180608091413_add_group_to_todos.rb
+++ b/db/migrate/20180608091413_add_group_to_todos.rb
@@ -1,4 +1,4 @@
-class AddGroupToTodos < ActiveRecord::Migration
+class AddGroupToTodos < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180608110058_rename_merge_requests_allow_collaboration.rb b/db/migrate/20180608110058_rename_merge_requests_allow_collaboration.rb
index 36f2a593fbe..0f2d5ba3a5e 100644
--- a/db/migrate/20180608110058_rename_merge_requests_allow_collaboration.rb
+++ b/db/migrate/20180608110058_rename_merge_requests_allow_collaboration.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameMergeRequestsAllowCollaboration < ActiveRecord::Migration
+class RenameMergeRequestsAllowCollaboration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180612103626_add_columns_for_helm_tiller_certificates.rb b/db/migrate/20180612103626_add_columns_for_helm_tiller_certificates.rb
index 57cea18abcd..d7273dff48e 100644
--- a/db/migrate/20180612103626_add_columns_for_helm_tiller_certificates.rb
+++ b/db/migrate/20180612103626_add_columns_for_helm_tiller_certificates.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class AddColumnsForHelmTillerCertificates < ActiveRecord::Migration
+class AddColumnsForHelmTillerCertificates < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180613081317_create_ci_builds_runner_session.rb b/db/migrate/20180613081317_create_ci_builds_runner_session.rb
index e550c07b9ab..eb41f76b105 100644
--- a/db/migrate/20180613081317_create_ci_builds_runner_session.rb
+++ b/db/migrate/20180613081317_create_ci_builds_runner_session.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CreateCiBuildsRunnerSession < ActiveRecord::Migration
+class CreateCiBuildsRunnerSession < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180625113853_create_import_export_uploads.rb b/db/migrate/20180625113853_create_import_export_uploads.rb
index be42304b0ae..d76b3e8cc15 100644
--- a/db/migrate/20180625113853_create_import_export_uploads.rb
+++ b/db/migrate/20180625113853_create_import_export_uploads.rb
@@ -1,4 +1,4 @@
-class CreateImportExportUploads < ActiveRecord::Migration
+class CreateImportExportUploads < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180626125654_add_index_on_deployable_for_deployments.rb b/db/migrate/20180626125654_add_index_on_deployable_for_deployments.rb
index a0e3a228f6c..0fc14b43fae 100644
--- a/db/migrate/20180626125654_add_index_on_deployable_for_deployments.rb
+++ b/db/migrate/20180626125654_add_index_on_deployable_for_deployments.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexOnDeployableForDeployments < ActiveRecord::Migration
+class AddIndexOnDeployableForDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180628124813_alter_web_hook_logs_indexes.rb b/db/migrate/20180628124813_alter_web_hook_logs_indexes.rb
index 289c87b30d2..64ef165c5e6 100644
--- a/db/migrate/20180628124813_alter_web_hook_logs_indexes.rb
+++ b/db/migrate/20180628124813_alter_web_hook_logs_indexes.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AlterWebHookLogsIndexes < ActiveRecord::Migration
+class AlterWebHookLogsIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180629153018_create_site_statistics.rb b/db/migrate/20180629153018_create_site_statistics.rb
index 085ce1ba64b..60a32b3b2a7 100644
--- a/db/migrate/20180629153018_create_site_statistics.rb
+++ b/db/migrate/20180629153018_create_site_statistics.rb
@@ -1,4 +1,4 @@
-class CreateSiteStatistics < ActiveRecord::Migration
+class CreateSiteStatistics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180702124358_remove_orphaned_routes.rb b/db/migrate/20180702124358_remove_orphaned_routes.rb
index 4068e479b6c..62c15f9cd00 100644
--- a/db/migrate/20180702124358_remove_orphaned_routes.rb
+++ b/db/migrate/20180702124358_remove_orphaned_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveOrphanedRoutes < ActiveRecord::Migration
+class RemoveOrphanedRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180702134423_generate_missing_routes.rb b/db/migrate/20180702134423_generate_missing_routes.rb
index 994725f9bd1..a440bc3179c 100644
--- a/db/migrate/20180702134423_generate_missing_routes.rb
+++ b/db/migrate/20180702134423_generate_missing_routes.rb
@@ -7,7 +7,7 @@
 # On GitLab.com this would insert 611 project routes, and 0 namespace routes.
 # The exact number could vary per instance, so we take care of both just in
 # case.
-class GenerateMissingRoutes < ActiveRecord::Migration
+class GenerateMissingRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180704204006_add_hide_third_party_offers_to_application_settings.rb b/db/migrate/20180704204006_add_hide_third_party_offers_to_application_settings.rb
index 6631c5d1b6c..03afbe217b5 100644
--- a/db/migrate/20180704204006_add_hide_third_party_offers_to_application_settings.rb
+++ b/db/migrate/20180704204006_add_hide_third_party_offers_to_application_settings.rb
@@ -1,4 +1,4 @@
-class AddHideThirdPartyOffersToApplicationSettings < ActiveRecord::Migration
+class AddHideThirdPartyOffersToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180705160945_add_file_format_to_ci_job_artifacts.rb b/db/migrate/20180705160945_add_file_format_to_ci_job_artifacts.rb
index 63c188693f3..938438841a5 100644
--- a/db/migrate/20180705160945_add_file_format_to_ci_job_artifacts.rb
+++ b/db/migrate/20180705160945_add_file_format_to_ci_job_artifacts.rb
@@ -1,4 +1,4 @@
-class AddFileFormatToCiJobArtifacts < ActiveRecord::Migration
+class AddFileFormatToCiJobArtifacts < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180710162338_add_foreign_key_from_notification_settings_to_users.rb b/db/migrate/20180710162338_add_foreign_key_from_notification_settings_to_users.rb
index 91656f194e5..79691f2b24c 100644
--- a/db/migrate/20180710162338_add_foreign_key_from_notification_settings_to_users.rb
+++ b/db/migrate/20180710162338_add_foreign_key_from_notification_settings_to_users.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyFromNotificationSettingsToUsers < ActiveRecord::Migration
+class AddForeignKeyFromNotificationSettingsToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class NotificationSetting < ActiveRecord::Base
diff --git a/db/migrate/20180711103851_drop_duplicate_protected_tags.rb b/db/migrate/20180711103851_drop_duplicate_protected_tags.rb
index 8fa2137551e..6166aa65f1f 100644
--- a/db/migrate/20180711103851_drop_duplicate_protected_tags.rb
+++ b/db/migrate/20180711103851_drop_duplicate_protected_tags.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class DropDuplicateProtectedTags < ActiveRecord::Migration
+class DropDuplicateProtectedTags < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   disable_ddl_transaction!
diff --git a/db/migrate/20180711103922_add_protected_tags_index.rb b/db/migrate/20180711103922_add_protected_tags_index.rb
index 7ed2258ebaf..ef81ca633c3 100644
--- a/db/migrate/20180711103922_add_protected_tags_index.rb
+++ b/db/migrate/20180711103922_add_protected_tags_index.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddProtectedTagsIndex < ActiveRecord::Migration
+class AddProtectedTagsIndex < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180713092803_create_user_statuses.rb b/db/migrate/20180713092803_create_user_statuses.rb
index cbe21b89ad9..43b96805c1e 100644
--- a/db/migrate/20180713092803_create_user_statuses.rb
+++ b/db/migrate/20180713092803_create_user_statuses.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateUserStatuses < ActiveRecord::Migration
+class CreateUserStatuses < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180717125853_remove_restricted_todos.rb b/db/migrate/20180717125853_remove_restricted_todos.rb
index fdf43921a73..1d4bbf6571e 100644
--- a/db/migrate/20180717125853_remove_restricted_todos.rb
+++ b/db/migrate/20180717125853_remove_restricted_todos.rb
@@ -2,7 +2,7 @@
 # for more information on how to write migrations for GitLab.
 # frozen_string_literal: true
 
-class RemoveRestrictedTodos < ActiveRecord::Migration
+class RemoveRestrictedTodos < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   disable_ddl_transaction!
 
diff --git a/db/migrate/20180718005113_add_instance_statistics_visibility_to_application_setting.rb b/db/migrate/20180718005113_add_instance_statistics_visibility_to_application_setting.rb
index 4b6c1f74346..ed5fa58b481 100644
--- a/db/migrate/20180718005113_add_instance_statistics_visibility_to_application_setting.rb
+++ b/db/migrate/20180718005113_add_instance_statistics_visibility_to_application_setting.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddInstanceStatisticsVisibilityToApplicationSetting < ActiveRecord::Migration
+class AddInstanceStatisticsVisibilityToApplicationSetting < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180720023512_add_receive_max_input_size_to_application_settings.rb b/db/migrate/20180720023512_add_receive_max_input_size_to_application_settings.rb
index 4ed851a0780..0cf3c78507e 100644
--- a/db/migrate/20180720023512_add_receive_max_input_size_to_application_settings.rb
+++ b/db/migrate/20180720023512_add_receive_max_input_size_to_application_settings.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddReceiveMaxInputSizeToApplicationSettings < ActiveRecord::Migration
+class AddReceiveMaxInputSizeToApplicationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180722103201_add_private_profile_to_users.rb b/db/migrate/20180722103201_add_private_profile_to_users.rb
index 4f7ef1322d8..c8d917065bb 100644
--- a/db/migrate/20180722103201_add_private_profile_to_users.rb
+++ b/db/migrate/20180722103201_add_private_profile_to_users.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPrivateProfileToUsers < ActiveRecord::Migration
+class AddPrivateProfileToUsers < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180723135214_add_web_ide_client_side_preview_enabled_to_application_settings.rb b/db/migrate/20180723135214_add_web_ide_client_side_preview_enabled_to_application_settings.rb
index 1ebb91da00c..23b8e04674a 100644
--- a/db/migrate/20180723135214_add_web_ide_client_side_preview_enabled_to_application_settings.rb
+++ b/db/migrate/20180723135214_add_web_ide_client_side_preview_enabled_to_application_settings.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddWebIdeClientSidePreviewEnabledToApplicationSettings < ActiveRecord::Migration
+class AddWebIdeClientSidePreviewEnabledToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180726172057_create_resource_label_events.rb b/db/migrate/20180726172057_create_resource_label_events.rb
index 2ef7078d898..550e35d6f90 100644
--- a/db/migrate/20180726172057_create_resource_label_events.rb
+++ b/db/migrate/20180726172057_create_resource_label_events.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateResourceLabelEvents < ActiveRecord::Migration
+class CreateResourceLabelEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180807153545_remove_redundant_status_index_on_ci_builds.rb b/db/migrate/20180807153545_remove_redundant_status_index_on_ci_builds.rb
index f4f7cb6f8ca..c957fc2f6fc 100644
--- a/db/migrate/20180807153545_remove_redundant_status_index_on_ci_builds.rb
+++ b/db/migrate/20180807153545_remove_redundant_status_index_on_ci_builds.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class RemoveRedundantStatusIndexOnCiBuilds < ActiveRecord::Migration
+class RemoveRedundantStatusIndexOnCiBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180808162000_add_user_show_add_ssh_key_message_to_application_settings.rb b/db/migrate/20180808162000_add_user_show_add_ssh_key_message_to_application_settings.rb
index e3019af2cc9..946d99a4c5f 100644
--- a/db/migrate/20180808162000_add_user_show_add_ssh_key_message_to_application_settings.rb
+++ b/db/migrate/20180808162000_add_user_show_add_ssh_key_message_to_application_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddUserShowAddSshKeyMessageToApplicationSettings < ActiveRecord::Migration
+class AddUserShowAddSshKeyMessageToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180813101999_change_default_of_auto_devops_instance_wide.rb b/db/migrate/20180813101999_change_default_of_auto_devops_instance_wide.rb
index 05d1124f5c4..da101bc76e3 100644
--- a/db/migrate/20180813101999_change_default_of_auto_devops_instance_wide.rb
+++ b/db/migrate/20180813101999_change_default_of_auto_devops_instance_wide.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class ChangeDefaultOfAutoDevopsInstanceWide < ActiveRecord::Migration
+class ChangeDefaultOfAutoDevopsInstanceWide < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180813102000_enable_auto_devops_instance_wide_for_everyone.rb b/db/migrate/20180813102000_enable_auto_devops_instance_wide_for_everyone.rb
index 21fb62806b3..1531fad2c6c 100644
--- a/db/migrate/20180813102000_enable_auto_devops_instance_wide_for_everyone.rb
+++ b/db/migrate/20180813102000_enable_auto_devops_instance_wide_for_everyone.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class EnableAutoDevopsInstanceWideForEveryone < ActiveRecord::Migration
+class EnableAutoDevopsInstanceWideForEveryone < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180814153625_add_commit_email_to_users.rb b/db/migrate/20180814153625_add_commit_email_to_users.rb
index 5c87d73688e..4d9217ea504 100644
--- a/db/migrate/20180814153625_add_commit_email_to_users.rb
+++ b/db/migrate/20180814153625_add_commit_email_to_users.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddCommitEmailToUsers < ActiveRecord::Migration
+class AddCommitEmailToUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180815040323_add_authorization_type_to_cluster_platforms_kubernetes.rb b/db/migrate/20180815040323_add_authorization_type_to_cluster_platforms_kubernetes.rb
index 6397d6dd99f..44125b4696a 100644
--- a/db/migrate/20180815040323_add_authorization_type_to_cluster_platforms_kubernetes.rb
+++ b/db/migrate/20180815040323_add_authorization_type_to_cluster_platforms_kubernetes.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddAuthorizationTypeToClusterPlatformsKubernetes < ActiveRecord::Migration
+class AddAuthorizationTypeToClusterPlatformsKubernetes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb b/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb
index 620342005fe..389101902d0 100644
--- a/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb
+++ b/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb
@@ -1,4 +1,4 @@
-class AddFileLocationToCiJobArtifacts < ActiveRecord::Migration
+class AddFileLocationToCiJobArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb b/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb
index 5e041ea6559..237e6ba4559 100644
--- a/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb
+++ b/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb
@@ -1,4 +1,4 @@
-class AddPartialIndexToCiBuildsArtifactsFile < ActiveRecord::Migration
+class AddPartialIndexToCiBuildsArtifactsFile < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180815175440_add_index_on_list_type.rb b/db/migrate/20180815175440_add_index_on_list_type.rb
index aad805e436e..3fe0f6b8de5 100644
--- a/db/migrate/20180815175440_add_index_on_list_type.rb
+++ b/db/migrate/20180815175440_add_index_on_list_type.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class AddIndexOnListType < ActiveRecord::Migration
+class AddIndexOnListType < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164904_fix_prometheus_metric_query_limits.rb b/db/migrate/20180831164904_fix_prometheus_metric_query_limits.rb
index 28c92e7c7ac..80c4d11a38e 100644
--- a/db/migrate/20180831164904_fix_prometheus_metric_query_limits.rb
+++ b/db/migrate/20180831164904_fix_prometheus_metric_query_limits.rb
@@ -4,7 +4,7 @@
 # for more information on how to write migrations for GitLab.
 require Rails.root.join('db/migrate/prometheus_metrics_limits_to_mysql')
 
-class FixPrometheusMetricQueryLimits < ActiveRecord::Migration
+class FixPrometheusMetricQueryLimits < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164905_add_common_to_prometheus_metrics.rb b/db/migrate/20180831164905_add_common_to_prometheus_metrics.rb
index e21c156fff6..5eb77d0480d 100644
--- a/db/migrate/20180831164905_add_common_to_prometheus_metrics.rb
+++ b/db/migrate/20180831164905_add_common_to_prometheus_metrics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddCommonToPrometheusMetrics < ActiveRecord::Migration
+class AddCommonToPrometheusMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164907_add_index_on_common_for_prometheus_metrics.rb b/db/migrate/20180831164907_add_index_on_common_for_prometheus_metrics.rb
index fdbaaf67b87..5758321891a 100644
--- a/db/migrate/20180831164907_add_index_on_common_for_prometheus_metrics.rb
+++ b/db/migrate/20180831164907_add_index_on_common_for_prometheus_metrics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexOnCommonForPrometheusMetrics < ActiveRecord::Migration
+class AddIndexOnCommonForPrometheusMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb b/db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb
index 67de990757e..7aa5950249c 100644
--- a/db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb
+++ b/db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIdentifierToPrometheusMetric < ActiveRecord::Migration
+class AddIdentifierToPrometheusMetric < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164909_add_index_for_identifier_to_prometheus_metric.rb b/db/migrate/20180831164909_add_index_for_identifier_to_prometheus_metric.rb
index b30c24ccafe..1f6cfc181f4 100644
--- a/db/migrate/20180831164909_add_index_for_identifier_to_prometheus_metric.rb
+++ b/db/migrate/20180831164909_add_index_for_identifier_to_prometheus_metric.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexForIdentifierToPrometheusMetric < ActiveRecord::Migration
+class AddIndexForIdentifierToPrometheusMetric < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180831164910_import_common_metrics.rb b/db/migrate/20180831164910_import_common_metrics.rb
index 72658c09b8e..f67d5f40aad 100644
--- a/db/migrate/20180831164910_import_common_metrics.rb
+++ b/db/migrate/20180831164910_import_common_metrics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class ImportCommonMetrics < ActiveRecord::Migration
+class ImportCommonMetrics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   require Rails.root.join('db/importers/common_metrics_importer.rb')
diff --git a/db/migrate/20180901171833_add_project_config_source_status_index_to_pipeline.rb b/db/migrate/20180901171833_add_project_config_source_status_index_to_pipeline.rb
index 99dfcc94b12..f2136657d95 100644
--- a/db/migrate/20180901171833_add_project_config_source_status_index_to_pipeline.rb
+++ b/db/migrate/20180901171833_add_project_config_source_status_index_to_pipeline.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddProjectConfigSourceStatusIndexToPipeline < ActiveRecord::Migration
+class AddProjectConfigSourceStatusIndexToPipeline < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180901200537_add_resource_label_event_reference_fields.rb b/db/migrate/20180901200537_add_resource_label_event_reference_fields.rb
index 264970ceed8..c8875e16914 100644
--- a/db/migrate/20180901200537_add_resource_label_event_reference_fields.rb
+++ b/db/migrate/20180901200537_add_resource_label_event_reference_fields.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddResourceLabelEventReferenceFields < ActiveRecord::Migration
+class AddResourceLabelEventReferenceFields < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180906101639_add_user_ping_consent_to_application_settings.rb b/db/migrate/20180906101639_add_user_ping_consent_to_application_settings.rb
index 5d0e67d2648..334efa12e7b 100644
--- a/db/migrate/20180906101639_add_user_ping_consent_to_application_settings.rb
+++ b/db/migrate/20180906101639_add_user_ping_consent_to_application_settings.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddUserPingConsentToApplicationSettings < ActiveRecord::Migration
+class AddUserPingConsentToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180907015926_add_legacy_abac_to_cluster_providers_gcp.rb b/db/migrate/20180907015926_add_legacy_abac_to_cluster_providers_gcp.rb
index 933047e32de..c57611a0f7d 100644
--- a/db/migrate/20180907015926_add_legacy_abac_to_cluster_providers_gcp.rb
+++ b/db/migrate/20180907015926_add_legacy_abac_to_cluster_providers_gcp.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddLegacyAbacToClusterProvidersGcp < ActiveRecord::Migration
+class AddLegacyAbacToClusterProvidersGcp < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb b/db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb
index 72f5c8d653b..ca8dbdba2bb 100644
--- a/db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb
+++ b/db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddAttrEncryptedColumnsToWebHook < ActiveRecord::Migration
+class AddAttrEncryptedColumnsToWebHook < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb b/db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb
index 203fcfe8eae..142e454832f 100644
--- a/db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb
+++ b/db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddTokenDigestToPersonalAccessTokens < ActiveRecord::Migration
+class AddTokenDigestToPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180910153413_add_index_to_token_digest_on_personal_access_tokens.rb b/db/migrate/20180910153413_add_index_to_token_digest_on_personal_access_tokens.rb
index 4300cd13a45..d501b07614a 100644
--- a/db/migrate/20180910153413_add_index_to_token_digest_on_personal_access_tokens.rb
+++ b/db/migrate/20180910153413_add_index_to_token_digest_on_personal_access_tokens.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexToTokenDigestOnPersonalAccessTokens < ActiveRecord::Migration
+class AddIndexToTokenDigestOnPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180912111628_add_knative_application.rb b/db/migrate/20180912111628_add_knative_application.rb
index bfda6a945a7..86d9100d2e7 100644
--- a/db/migrate/20180912111628_add_knative_application.rb
+++ b/db/migrate/20180912111628_add_knative_application.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddKnativeApplication < ActiveRecord::Migration
+class AddKnativeApplication < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180916011959_add_index_pipelines_project_id_source.rb b/db/migrate/20180916011959_add_index_pipelines_project_id_source.rb
index b9bebf30cf0..5b71c79ac86 100644
--- a/db/migrate/20180916011959_add_index_pipelines_project_id_source.rb
+++ b/db/migrate/20180916011959_add_index_pipelines_project_id_source.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddIndexPipelinesProjectIdSource < ActiveRecord::Migration
+class AddIndexPipelinesProjectIdSource < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180924141949_add_diff_max_patch_bytes_to_application_settings.rb b/db/migrate/20180924141949_add_diff_max_patch_bytes_to_application_settings.rb
index 084dfc65ce5..5dac5f0d100 100644
--- a/db/migrate/20180924141949_add_diff_max_patch_bytes_to_application_settings.rb
+++ b/db/migrate/20180924141949_add_diff_max_patch_bytes_to_application_settings.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddDiffMaxPatchBytesToApplicationSettings < ActiveRecord::Migration
+class AddDiffMaxPatchBytesToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/migrate/20180924190739_add_scheduled_at_to_ci_builds.rb b/db/migrate/20180924190739_add_scheduled_at_to_ci_builds.rb
index c163fbb1fd6..cd2f8b59d41 100644
--- a/db/migrate/20180924190739_add_scheduled_at_to_ci_builds.rb
+++ b/db/migrate/20180924190739_add_scheduled_at_to_ci_builds.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddScheduledAtToCiBuilds < ActiveRecord::Migration
+class AddScheduledAtToCiBuilds < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20180924201039_add_partial_index_to_scheduled_at.rb b/db/migrate/20180924201039_add_partial_index_to_scheduled_at.rb
index 81bf0d94e11..378fc4e5fea 100644
--- a/db/migrate/20180924201039_add_partial_index_to_scheduled_at.rb
+++ b/db/migrate/20180924201039_add_partial_index_to_scheduled_at.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddPartialIndexToScheduledAt < ActiveRecord::Migration
+class AddPartialIndexToScheduledAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20180925200829_create_user_preferences.rb b/db/migrate/20180925200829_create_user_preferences.rb
index 755cabdabde..b46df8157a6 100644
--- a/db/migrate/20180925200829_create_user_preferences.rb
+++ b/db/migrate/20180925200829_create_user_preferences.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateUserPreferences < ActiveRecord::Migration
+class CreateUserPreferences < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   class UserPreference < ActiveRecord::Base
diff --git a/db/migrate/20180927073410_add_index_to_project_deploy_tokens_deploy_token_id.rb b/db/migrate/20180927073410_add_index_to_project_deploy_tokens_deploy_token_id.rb
index 61d32fe16eb..80577c52a01 100644
--- a/db/migrate/20180927073410_add_index_to_project_deploy_tokens_deploy_token_id.rb
+++ b/db/migrate/20180927073410_add_index_to_project_deploy_tokens_deploy_token_id.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexToProjectDeployTokensDeployTokenId < ActiveRecord::Migration
+class AddIndexToProjectDeployTokensDeployTokenId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181002172433_remove_restricted_todos_with_cte.rb b/db/migrate/20181002172433_remove_restricted_todos_with_cte.rb
index 0a8f4a12266..7826c8d802e 100644
--- a/db/migrate/20181002172433_remove_restricted_todos_with_cte.rb
+++ b/db/migrate/20181002172433_remove_restricted_todos_with_cte.rb
@@ -3,7 +3,7 @@
 # for more information on how to write migrations for GitLab.
 
 # rescheduling of the revised RemoveRestrictedTodos background migration
-class RemoveRestrictedTodosWithCte < ActiveRecord::Migration
+class RemoveRestrictedTodosWithCte < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   disable_ddl_transaction!
 
diff --git a/db/migrate/20181005110927_add_index_to_lfs_objects_file_store.rb b/db/migrate/20181005110927_add_index_to_lfs_objects_file_store.rb
index d09543aa4cc..ff17a0a567d 100644
--- a/db/migrate/20181005110927_add_index_to_lfs_objects_file_store.rb
+++ b/db/migrate/20181005110927_add_index_to_lfs_objects_file_store.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexToLfsObjectsFileStore < ActiveRecord::Migration
+class AddIndexToLfsObjectsFileStore < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181005125926_add_index_to_uploads_store.rb b/db/migrate/20181005125926_add_index_to_uploads_store.rb
index d32ca05e980..d9e31225b6f 100644
--- a/db/migrate/20181005125926_add_index_to_uploads_store.rb
+++ b/db/migrate/20181005125926_add_index_to_uploads_store.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexToUploadsStore < ActiveRecord::Migration
+class AddIndexToUploadsStore < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb b/db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb
index a58c190e1d6..62ad6c63d0a 100644
--- a/db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb
+++ b/db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateClustersKubernetesNamespaces < ActiveRecord::Migration
+class CreateClustersKubernetesNamespaces < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   INDEX_NAME = 'kubernetes_namespaces_cluster_and_namespace'
 
diff --git a/db/migrate/20181010235606_create_board_project_recent_visits.rb b/db/migrate/20181010235606_create_board_project_recent_visits.rb
index 426f41e202a..07bfbdda26b 100644
--- a/db/migrate/20181010235606_create_board_project_recent_visits.rb
+++ b/db/migrate/20181010235606_create_board_project_recent_visits.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateBoardProjectRecentVisits < ActiveRecord::Migration
+class CreateBoardProjectRecentVisits < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181014203236_create_cluster_groups.rb b/db/migrate/20181014203236_create_cluster_groups.rb
index 69382d5c851..33ae9a4a478 100644
--- a/db/migrate/20181014203236_create_cluster_groups.rb
+++ b/db/migrate/20181014203236_create_cluster_groups.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateClusterGroups < ActiveRecord::Migration
+class CreateClusterGroups < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181015155839_add_finished_at_to_deployments.rb b/db/migrate/20181015155839_add_finished_at_to_deployments.rb
index 1a061bb0f5f..bb8d6cdcf2c 100644
--- a/db/migrate/20181015155839_add_finished_at_to_deployments.rb
+++ b/db/migrate/20181015155839_add_finished_at_to_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddFinishedAtToDeployments < ActiveRecord::Migration
+class AddFinishedAtToDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181016141739_add_status_to_deployments.rb b/db/migrate/20181016141739_add_status_to_deployments.rb
index 321172696b4..2ff778448b4 100644
--- a/db/migrate/20181016141739_add_status_to_deployments.rb
+++ b/db/migrate/20181016141739_add_status_to_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddStatusToDeployments < ActiveRecord::Migration
+class AddStatusToDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DEPLOYMENT_STATUS_SUCCESS = 2 # Equivalent to Deployment.state_machine.states['success'].value
diff --git a/db/migrate/20181016152238_create_board_group_recent_visits.rb b/db/migrate/20181016152238_create_board_group_recent_visits.rb
index 1e55dc8658e..9e240a5f97f 100644
--- a/db/migrate/20181016152238_create_board_group_recent_visits.rb
+++ b/db/migrate/20181016152238_create_board_group_recent_visits.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class CreateBoardGroupRecentVisits < ActiveRecord::Migration
+class CreateBoardGroupRecentVisits < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181017001059_add_cluster_type_to_clusters.rb b/db/migrate/20181017001059_add_cluster_type_to_clusters.rb
index 191e7eb4fb3..d032afe1a43 100644
--- a/db/migrate/20181017001059_add_cluster_type_to_clusters.rb
+++ b/db/migrate/20181017001059_add_cluster_type_to_clusters.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddClusterTypeToClusters < ActiveRecord::Migration
+class AddClusterTypeToClusters < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181019032400_add_shards_table.rb b/db/migrate/20181019032400_add_shards_table.rb
index 5e0a6960548..e31af97cc94 100644
--- a/db/migrate/20181019032400_add_shards_table.rb
+++ b/db/migrate/20181019032400_add_shards_table.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddShardsTable < ActiveRecord::Migration
+class AddShardsTable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20181019032408_add_repositories_table.rb b/db/migrate/20181019032408_add_repositories_table.rb
index 077f264d3ce..2153c1c9fc6 100644
--- a/db/migrate/20181019032408_add_repositories_table.rb
+++ b/db/migrate/20181019032408_add_repositories_table.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddRepositoriesTable < ActiveRecord::Migration
+class AddRepositoriesTable < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/migrate/20181019105553_add_projects_pool_repository_id_foreign_key.rb b/db/migrate/20181019105553_add_projects_pool_repository_id_foreign_key.rb
index 059988de38a..dddf44ce488 100644
--- a/db/migrate/20181019105553_add_projects_pool_repository_id_foreign_key.rb
+++ b/db/migrate/20181019105553_add_projects_pool_repository_id_foreign_key.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddProjectsPoolRepositoryIdForeignKey < ActiveRecord::Migration
+class AddProjectsPoolRepositoryIdForeignKey < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181022135539_add_index_on_status_to_deployments.rb b/db/migrate/20181022135539_add_index_on_status_to_deployments.rb
index 2eed20aa855..9c7a722c626 100644
--- a/db/migrate/20181022135539_add_index_on_status_to_deployments.rb
+++ b/db/migrate/20181022135539_add_index_on_status_to_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexOnStatusToDeployments < ActiveRecord::Migration
+class AddIndexOnStatusToDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181023104858_add_archive_builds_duration_to_application_settings.rb b/db/migrate/20181023104858_add_archive_builds_duration_to_application_settings.rb
index 744748b3fad..5d7a21fc5b5 100644
--- a/db/migrate/20181023104858_add_archive_builds_duration_to_application_settings.rb
+++ b/db/migrate/20181023104858_add_archive_builds_duration_to_application_settings.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddArchiveBuildsDurationToApplicationSettings < ActiveRecord::Migration
+class AddArchiveBuildsDurationToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181023144439_add_partial_index_for_legacy_successful_deployments.rb b/db/migrate/20181023144439_add_partial_index_for_legacy_successful_deployments.rb
index 5896102af1c..e90e59b57a9 100644
--- a/db/migrate/20181023144439_add_partial_index_for_legacy_successful_deployments.rb
+++ b/db/migrate/20181023144439_add_partial_index_for_legacy_successful_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddPartialIndexForLegacySuccessfulDeployments < ActiveRecord::Migration
+class AddPartialIndexForLegacySuccessfulDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb b/db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb
index 89ddaf2ae2b..052a344f182 100644
--- a/db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb
+++ b/db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddPrivateCommitEmailHostnameToApplicationSettings < ActiveRecord::Migration
+class AddPrivateCommitEmailHostnameToApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181026143227_migrate_snippets_access_level_default_value.rb b/db/migrate/20181026143227_migrate_snippets_access_level_default_value.rb
index ede0ee27b8a..2f4ef33b253 100644
--- a/db/migrate/20181026143227_migrate_snippets_access_level_default_value.rb
+++ b/db/migrate/20181026143227_migrate_snippets_access_level_default_value.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateSnippetsAccessLevelDefaultValue < ActiveRecord::Migration
+class MigrateSnippetsAccessLevelDefaultValue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181030154446_add_missing_indexes_for_foreign_keys.rb b/db/migrate/20181030154446_add_missing_indexes_for_foreign_keys.rb
index 176d55565d8..2b5cd45e92c 100644
--- a/db/migrate/20181030154446_add_missing_indexes_for_foreign_keys.rb
+++ b/db/migrate/20181030154446_add_missing_indexes_for_foreign_keys.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddMissingIndexesForForeignKeys < ActiveRecord::Migration
+class AddMissingIndexesForForeignKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb b/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb
index a7106111f46..2c1dea05808 100644
--- a/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb
+++ b/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class DropFkGcpClustersTable < ActiveRecord::Migration
+class DropFkGcpClustersTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181031190559_drop_gcp_clusters_table.rb b/db/migrate/20181031190559_drop_gcp_clusters_table.rb
index 808d474b4fc..597fe49f4c8 100644
--- a/db/migrate/20181031190559_drop_gcp_clusters_table.rb
+++ b/db/migrate/20181031190559_drop_gcp_clusters_table.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class DropGcpClustersTable < ActiveRecord::Migration
+class DropGcpClustersTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181101144347_add_index_for_stuck_mr_query.rb b/db/migrate/20181101144347_add_index_for_stuck_mr_query.rb
index 5d3ace54e5c..569eaa8b22c 100644
--- a/db/migrate/20181101144347_add_index_for_stuck_mr_query.rb
+++ b/db/migrate/20181101144347_add_index_for_stuck_mr_query.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class AddIndexForStuckMrQuery < ActiveRecord::Migration
+class AddIndexForStuckMrQuery < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181106135939_add_index_to_deployments.rb b/db/migrate/20181106135939_add_index_to_deployments.rb
index 5f988a4723c..e8181e61d22 100644
--- a/db/migrate/20181106135939_add_index_to_deployments.rb
+++ b/db/migrate/20181106135939_add_index_to_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class AddIndexToDeployments < ActiveRecord::Migration
+class AddIndexToDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/migrate/20181112103239_drop_default_value_on_status_deployments.rb b/db/migrate/20181112103239_drop_default_value_on_status_deployments.rb
index a480c15e66b..59d6d2f29ff 100644
--- a/db/migrate/20181112103239_drop_default_value_on_status_deployments.rb
+++ b/db/migrate/20181112103239_drop_default_value_on_status_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class DropDefaultValueOnStatusDeployments < ActiveRecord::Migration
+class DropDefaultValueOnStatusDeployments < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   DEPLOYMENT_STATUS_SUCCESS = 2 # Equivalent to Deployment.state_machine.states['success'].value
 
diff --git a/db/migrate/gpg_keys_limits_to_mysql.rb b/db/migrate/gpg_keys_limits_to_mysql.rb
index 38729320d8c..2cd347a0463 100644
--- a/db/migrate/gpg_keys_limits_to_mysql.rb
+++ b/db/migrate/gpg_keys_limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class IncreaseMysqlTextLimitForGpgKeys < ActiveRecord::Migration
+class IncreaseMysqlTextLimitForGpgKeys < ActiveRecord::Migration[4.2]
   # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
diff --git a/db/migrate/limits_ci_build_trace_chunks_raw_data_for_mysql.rb b/db/migrate/limits_ci_build_trace_chunks_raw_data_for_mysql.rb
index 9fd23aae1e5..92402cf387b 100644
--- a/db/migrate/limits_ci_build_trace_chunks_raw_data_for_mysql.rb
+++ b/db/migrate/limits_ci_build_trace_chunks_raw_data_for_mysql.rb
@@ -1,4 +1,4 @@
-class LimitsCiBuildTraceChunksRawDataForMysql < ActiveRecord::Migration
+class LimitsCiBuildTraceChunksRawDataForMysql < ActiveRecord::Migration[4.2]
   def up
     return unless Gitlab::Database.mysql?
 
diff --git a/db/migrate/limits_to_mysql.rb b/db/migrate/limits_to_mysql.rb
index 7507a4bb431..87992b541b1 100644
--- a/db/migrate/limits_to_mysql.rb
+++ b/db/migrate/limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class LimitsToMysql < ActiveRecord::Migration
+class LimitsToMysql < ActiveRecord::Migration[4.2]
   def up
     return unless ActiveRecord::Base.configurations[Rails.env]['adapter'] =~ /^mysql/
 
diff --git a/db/migrate/markdown_cache_limits_to_mysql.rb b/db/migrate/markdown_cache_limits_to_mysql.rb
index f6686db3dc0..f99d500a137 100644
--- a/db/migrate/markdown_cache_limits_to_mysql.rb
+++ b/db/migrate/markdown_cache_limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class MarkdownCacheLimitsToMysql < ActiveRecord::Migration
+class MarkdownCacheLimitsToMysql < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/merge_request_diff_file_limits_to_mysql.rb b/db/migrate/merge_request_diff_file_limits_to_mysql.rb
index ca3bc7d6be9..65dd0b5b7f7 100644
--- a/db/migrate/merge_request_diff_file_limits_to_mysql.rb
+++ b/db/migrate/merge_request_diff_file_limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class MergeRequestDiffFileLimitsToMysql < ActiveRecord::Migration
+class MergeRequestDiffFileLimitsToMysql < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/migrate/prometheus_metrics_limits_to_mysql.rb b/db/migrate/prometheus_metrics_limits_to_mysql.rb
index 79f4ab9b64b..f7a2fcba8c2 100644
--- a/db/migrate/prometheus_metrics_limits_to_mysql.rb
+++ b/db/migrate/prometheus_metrics_limits_to_mysql.rb
@@ -1,4 +1,4 @@
-class PrometheusMetricsLimitsToMysql < ActiveRecord::Migration
+class PrometheusMetricsLimitsToMysql < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/optional_migrations/composite_primary_keys.rb b/db/optional_migrations/composite_primary_keys.rb
index b330da13d43..e0bb0312a35 100644
--- a/db/optional_migrations/composite_primary_keys.rb
+++ b/db/optional_migrations/composite_primary_keys.rb
@@ -7,7 +7,7 @@
 # which requires all tables to have a primary key constraint.
 #
 # In that sense, the migration is optional and not strictly needed.
-class CompositePrimaryKeysMigration < ActiveRecord::Migration
+class CompositePrimaryKeysMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20160824121037_change_personal_access_tokens_default_back_to_empty_array.rb b/db/post_migrate/20160824121037_change_personal_access_tokens_default_back_to_empty_array.rb
index 7df561d82dd..099814d7556 100644
--- a/db/post_migrate/20160824121037_change_personal_access_tokens_default_back_to_empty_array.rb
+++ b/db/post_migrate/20160824121037_change_personal_access_tokens_default_back_to_empty_array.rb
@@ -4,7 +4,7 @@
 #
 # Details: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5951#note_19721973
 
-class ChangePersonalAccessTokensDefaultBackToEmptyArray < ActiveRecord::Migration
+class ChangePersonalAccessTokensDefaultBackToEmptyArray < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20161011222551_remove_inactive_jira_service_properties.rb b/db/post_migrate/20161011222551_remove_inactive_jira_service_properties.rb
index 319d86ac159..bf3aee99418 100644
--- a/db/post_migrate/20161011222551_remove_inactive_jira_service_properties.rb
+++ b/db/post_migrate/20161011222551_remove_inactive_jira_service_properties.rb
@@ -1,4 +1,4 @@
-class RemoveInactiveJiraServiceProperties < ActiveRecord::Migration
+class RemoveInactiveJiraServiceProperties < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = true
diff --git a/db/post_migrate/20161109150329_fix_project_records_with_invalid_visibility.rb b/db/post_migrate/20161109150329_fix_project_records_with_invalid_visibility.rb
index f058e85c1ec..d77a22bfb69 100644
--- a/db/post_migrate/20161109150329_fix_project_records_with_invalid_visibility.rb
+++ b/db/post_migrate/20161109150329_fix_project_records_with_invalid_visibility.rb
@@ -1,4 +1,4 @@
-class FixProjectRecordsWithInvalidVisibility < ActiveRecord::Migration
+class FixProjectRecordsWithInvalidVisibility < ActiveRecord::Migration[4.2]
   include Gitlab::Database::ArelMethods
   include Gitlab::Database::MigrationHelpers
 
diff --git a/db/post_migrate/20161128170531_drop_user_activities_table.rb b/db/post_migrate/20161128170531_drop_user_activities_table.rb
index 00bc0c73015..64d13a08953 100644
--- a/db/post_migrate/20161128170531_drop_user_activities_table.rb
+++ b/db/post_migrate/20161128170531_drop_user_activities_table.rb
@@ -1,4 +1,4 @@
-class DropUserActivitiesTable < ActiveRecord::Migration
+class DropUserActivitiesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20161221140236_remove_unneeded_services.rb b/db/post_migrate/20161221140236_remove_unneeded_services.rb
index 6b7e94c8641..31f24263877 100644
--- a/db/post_migrate/20161221140236_remove_unneeded_services.rb
+++ b/db/post_migrate/20161221140236_remove_unneeded_services.rb
@@ -1,4 +1,4 @@
-class RemoveUnneededServices < ActiveRecord::Migration
+class RemoveUnneededServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20161221153951_rename_reserved_project_names.rb b/db/post_migrate/20161221153951_rename_reserved_project_names.rb
index 678876e886c..b7665e98490 100644
--- a/db/post_migrate/20161221153951_rename_reserved_project_names.rb
+++ b/db/post_migrate/20161221153951_rename_reserved_project_names.rb
@@ -1,4 +1,4 @@
-class RenameReservedProjectNames < ActiveRecord::Migration
+class RenameReservedProjectNames < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   include Gitlab::ShellAdapter
 
diff --git a/db/post_migrate/20170104150317_requeue_pending_delete_projects.rb b/db/post_migrate/20170104150317_requeue_pending_delete_projects.rb
index d7be004d47f..f567accb051 100644
--- a/db/post_migrate/20170104150317_requeue_pending_delete_projects.rb
+++ b/db/post_migrate/20170104150317_requeue_pending_delete_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RequeuePendingDeleteProjects < ActiveRecord::Migration
+class RequeuePendingDeleteProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170106142508_fill_authorized_projects.rb b/db/post_migrate/20170106142508_fill_authorized_projects.rb
index 0ca20587981..1f1dd0f47f0 100644
--- a/db/post_migrate/20170106142508_fill_authorized_projects.rb
+++ b/db/post_migrate/20170106142508_fill_authorized_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class FillAuthorizedProjects < ActiveRecord::Migration
+class FillAuthorizedProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class User < ActiveRecord::Base
diff --git a/db/post_migrate/20170106172224_remove_project_authorizations_id_column.rb b/db/post_migrate/20170106172224_remove_project_authorizations_id_column.rb
index 7c788160022..893af23465a 100644
--- a/db/post_migrate/20170106172224_remove_project_authorizations_id_column.rb
+++ b/db/post_migrate/20170106172224_remove_project_authorizations_id_column.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveProjectAuthorizationsIdColumn < ActiveRecord::Migration
+class RemoveProjectAuthorizationsIdColumn < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170131214021_reset_users_authorized_projects_populated.rb b/db/post_migrate/20170131214021_reset_users_authorized_projects_populated.rb
index f1f81691f81..055a14ad729 100644
--- a/db/post_migrate/20170131214021_reset_users_authorized_projects_populated.rb
+++ b/db/post_migrate/20170131214021_reset_users_authorized_projects_populated.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class ResetUsersAuthorizedProjectsPopulated < ActiveRecord::Migration
+class ResetUsersAuthorizedProjectsPopulated < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170206040400_remove_inactive_default_email_services.rb b/db/post_migrate/20170206040400_remove_inactive_default_email_services.rb
index a8e63e8bc7d..f221dac8e20 100644
--- a/db/post_migrate/20170206040400_remove_inactive_default_email_services.rb
+++ b/db/post_migrate/20170206040400_remove_inactive_default_email_services.rb
@@ -1,4 +1,4 @@
-class RemoveInactiveDefaultEmailServices < ActiveRecord::Migration
+class RemoveInactiveDefaultEmailServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170206101007_remove_trackable_columns_from_timelogs.rb b/db/post_migrate/20170206101007_remove_trackable_columns_from_timelogs.rb
index aee0c1b6245..14f5d0d4add 100644
--- a/db/post_migrate/20170206101007_remove_trackable_columns_from_timelogs.rb
+++ b/db/post_migrate/20170206101007_remove_trackable_columns_from_timelogs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveTrackableColumnsFromTimelogs < ActiveRecord::Migration
+class RemoveTrackableColumnsFromTimelogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170206101030_validate_foreign_keys_on_timelogs.rb b/db/post_migrate/20170206101030_validate_foreign_keys_on_timelogs.rb
index f397ef919cc..b5a5c0f06c7 100644
--- a/db/post_migrate/20170206101030_validate_foreign_keys_on_timelogs.rb
+++ b/db/post_migrate/20170206101030_validate_foreign_keys_on_timelogs.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ValidateForeignKeysOnTimelogs < ActiveRecord::Migration
+class ValidateForeignKeysOnTimelogs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170209140523_validate_foreign_keys_on_oauth_openid_requests.rb b/db/post_migrate/20170209140523_validate_foreign_keys_on_oauth_openid_requests.rb
index e206f9af636..81ac4cf1373 100644
--- a/db/post_migrate/20170209140523_validate_foreign_keys_on_oauth_openid_requests.rb
+++ b/db/post_migrate/20170209140523_validate_foreign_keys_on_oauth_openid_requests.rb
@@ -1,4 +1,4 @@
-class ValidateForeignKeysOnOauthOpenidRequests < ActiveRecord::Migration
+class ValidateForeignKeysOnOauthOpenidRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170211073944_disable_invalid_service_templates.rb b/db/post_migrate/20170211073944_disable_invalid_service_templates.rb
index 603efc43782..31234e5b086 100644
--- a/db/post_migrate/20170211073944_disable_invalid_service_templates.rb
+++ b/db/post_migrate/20170211073944_disable_invalid_service_templates.rb
@@ -1,4 +1,4 @@
-class DisableInvalidServiceTemplates < ActiveRecord::Migration
+class DisableInvalidServiceTemplates < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   class Service < ActiveRecord::Base
diff --git a/db/post_migrate/20170214111112_delete_deprecated_gitlab_ci_service.rb b/db/post_migrate/20170214111112_delete_deprecated_gitlab_ci_service.rb
index 09a827d22b0..c273060f8b0 100644
--- a/db/post_migrate/20170214111112_delete_deprecated_gitlab_ci_service.rb
+++ b/db/post_migrate/20170214111112_delete_deprecated_gitlab_ci_service.rb
@@ -1,4 +1,4 @@
-class DeleteDeprecatedGitlabCiService < ActiveRecord::Migration
+class DeleteDeprecatedGitlabCiService < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170215200045_remove_theme_id_from_users.rb b/db/post_migrate/20170215200045_remove_theme_id_from_users.rb
index c51646fbe52..937fe3f57af 100644
--- a/db/post_migrate/20170215200045_remove_theme_id_from_users.rb
+++ b/db/post_migrate/20170215200045_remove_theme_id_from_users.rb
@@ -1,4 +1,4 @@
-class RemoveThemeIdFromUsers < ActiveRecord::Migration
+class RemoveThemeIdFromUsers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170301205640_migrate_build_events_to_pipeline_events.rb b/db/post_migrate/20170301205640_migrate_build_events_to_pipeline_events.rb
index 04bf89c9687..c2d28d79491 100644
--- a/db/post_migrate/20170301205640_migrate_build_events_to_pipeline_events.rb
+++ b/db/post_migrate/20170301205640_migrate_build_events_to_pipeline_events.rb
@@ -1,4 +1,4 @@
-class MigrateBuildEventsToPipelineEvents < ActiveRecord::Migration
+class MigrateBuildEventsToPipelineEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170306170512_migrate_legacy_manual_actions.rb b/db/post_migrate/20170306170512_migrate_legacy_manual_actions.rb
index ec6e8cdfc45..aa12e8ac3da 100644
--- a/db/post_migrate/20170306170512_migrate_legacy_manual_actions.rb
+++ b/db/post_migrate/20170306170512_migrate_legacy_manual_actions.rb
@@ -1,4 +1,4 @@
-class MigrateLegacyManualActions < ActiveRecord::Migration
+class MigrateLegacyManualActions < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170309171644_reset_relative_position_for_issue.rb b/db/post_migrate/20170309171644_reset_relative_position_for_issue.rb
index 49fd46b0262..2cf4cf61d8f 100644
--- a/db/post_migrate/20170309171644_reset_relative_position_for_issue.rb
+++ b/db/post_migrate/20170309171644_reset_relative_position_for_issue.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class ResetRelativePositionForIssue < ActiveRecord::Migration
+class ResetRelativePositionForIssue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170313133418_rename_more_reserved_project_names.rb b/db/post_migrate/20170313133418_rename_more_reserved_project_names.rb
index 26a67b0f814..cac3fd713eb 100644
--- a/db/post_migrate/20170313133418_rename_more_reserved_project_names.rb
+++ b/db/post_migrate/20170313133418_rename_more_reserved_project_names.rb
@@ -1,4 +1,4 @@
-class RenameMoreReservedProjectNames < ActiveRecord::Migration
+class RenameMoreReservedProjectNames < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   include Gitlab::ShellAdapter
 
diff --git a/db/post_migrate/20170317162059_update_upload_paths_to_system.rb b/db/post_migrate/20170317162059_update_upload_paths_to_system.rb
index 92e33848bf0..a5a6f043e10 100644
--- a/db/post_migrate/20170317162059_update_upload_paths_to_system.rb
+++ b/db/post_migrate/20170317162059_update_upload_paths_to_system.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class UpdateUploadPathsToSystem < ActiveRecord::Migration
+class UpdateUploadPathsToSystem < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170324160416_migrate_user_activities_to_users_last_activity_on.rb b/db/post_migrate/20170324160416_migrate_user_activities_to_users_last_activity_on.rb
index 392fa00b1ba..73989339ad9 100644
--- a/db/post_migrate/20170324160416_migrate_user_activities_to_users_last_activity_on.rb
+++ b/db/post_migrate/20170324160416_migrate_user_activities_to_users_last_activity_on.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class MigrateUserActivitiesToUsersLastActivityOn < ActiveRecord::Migration
+class MigrateUserActivitiesToUsersLastActivityOn < ActiveRecord::Migration[4.2]
   include Gitlab::Database::ArelMethods
   include Gitlab::Database::MigrationHelpers
 
diff --git a/db/post_migrate/20170404170532_remove_notes_original_discussion_id.rb b/db/post_migrate/20170404170532_remove_notes_original_discussion_id.rb
index 0c3b3bd5eb3..334742f04e4 100644
--- a/db/post_migrate/20170404170532_remove_notes_original_discussion_id.rb
+++ b/db/post_migrate/20170404170532_remove_notes_original_discussion_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveNotesOriginalDiscussionId < ActiveRecord::Migration
+class RemoveNotesOriginalDiscussionId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170406111121_clean_upload_symlinks.rb b/db/post_migrate/20170406111121_clean_upload_symlinks.rb
index 0ab3d61730d..5fec00aa198 100644
--- a/db/post_migrate/20170406111121_clean_upload_symlinks.rb
+++ b/db/post_migrate/20170406111121_clean_upload_symlinks.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanUploadSymlinks < ActiveRecord::Migration
+class CleanUploadSymlinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/post_migrate/20170406142253_migrate_user_project_view.rb b/db/post_migrate/20170406142253_migrate_user_project_view.rb
index d6061dd416d..3601baba787 100644
--- a/db/post_migrate/20170406142253_migrate_user_project_view.rb
+++ b/db/post_migrate/20170406142253_migrate_user_project_view.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateUserProjectView < ActiveRecord::Migration
+class MigrateUserProjectView < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20170408033905_remove_old_cache_directories.rb b/db/post_migrate/20170408033905_remove_old_cache_directories.rb
index b23b52896b9..22bc5b9db7b 100644
--- a/db/post_migrate/20170408033905_remove_old_cache_directories.rb
+++ b/db/post_migrate/20170408033905_remove_old_cache_directories.rb
@@ -4,7 +4,7 @@
 # Remove all files from old custom carrierwave's cache directories.
 # See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9466
 
-class RemoveOldCacheDirectories < ActiveRecord::Migration
+class RemoveOldCacheDirectories < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170412174900_rename_reserved_dynamic_paths.rb b/db/post_migrate/20170412174900_rename_reserved_dynamic_paths.rb
index 08cf366f0a1..c9ff91b0401 100644
--- a/db/post_migrate/20170412174900_rename_reserved_dynamic_paths.rb
+++ b/db/post_migrate/20170412174900_rename_reserved_dynamic_paths.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameReservedDynamicPaths < ActiveRecord::Migration
+class RenameReservedDynamicPaths < ActiveRecord::Migration[4.2]
   include Gitlab::Database::RenameReservedPathsMigration::V1
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170425121605_migrate_trigger_schedules_to_pipeline_schedules.rb b/db/post_migrate/20170425121605_migrate_trigger_schedules_to_pipeline_schedules.rb
index dae9750558f..99ded277277 100644
--- a/db/post_migrate/20170425121605_migrate_trigger_schedules_to_pipeline_schedules.rb
+++ b/db/post_migrate/20170425121605_migrate_trigger_schedules_to_pipeline_schedules.rb
@@ -1,4 +1,4 @@
-class MigrateTriggerSchedulesToPipelineSchedules < ActiveRecord::Migration
+class MigrateTriggerSchedulesToPipelineSchedules < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170425130047_drop_ci_trigger_schedules_table.rb b/db/post_migrate/20170425130047_drop_ci_trigger_schedules_table.rb
index 24750c58ef0..9d515aca8b4 100644
--- a/db/post_migrate/20170425130047_drop_ci_trigger_schedules_table.rb
+++ b/db/post_migrate/20170425130047_drop_ci_trigger_schedules_table.rb
@@ -1,4 +1,4 @@
-class DropCiTriggerSchedulesTable < ActiveRecord::Migration
+class DropCiTriggerSchedulesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170502070007_enable_auto_cancel_pending_pipelines_for_all.rb b/db/post_migrate/20170502070007_enable_auto_cancel_pending_pipelines_for_all.rb
index 845c6f0557f..4d091d7f275 100644
--- a/db/post_migrate/20170502070007_enable_auto_cancel_pending_pipelines_for_all.rb
+++ b/db/post_migrate/20170502070007_enable_auto_cancel_pending_pipelines_for_all.rb
@@ -1,6 +1,6 @@
 # rubocop:disable Migration/UpdateLargeTable
 # rubocop:disable Migration/UpdateColumnInBatches
-class EnableAutoCancelPendingPipelinesForAll < ActiveRecord::Migration
+class EnableAutoCancelPendingPipelinesForAll < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb b/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
index 5238a2ba1b7..c018d30c175 100644
--- a/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
+++ b/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
@@ -1,6 +1,6 @@
 # This is the counterpart of RequeuePendingDeleteProjects and cleans all
 # projects with `pending_delete = true` and that do not have a namespace.
-class CleanupNamespacelessPendingDeleteProjects < ActiveRecord::Migration
+class CleanupNamespacelessPendingDeleteProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170503004427_update_retried_for_ci_build.rb b/db/post_migrate/20170503004427_update_retried_for_ci_build.rb
index 079f0e7511f..596f8593308 100644
--- a/db/post_migrate/20170503004427_update_retried_for_ci_build.rb
+++ b/db/post_migrate/20170503004427_update_retried_for_ci_build.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class UpdateRetriedForCiBuild < ActiveRecord::Migration
+class UpdateRetriedForCiBuild < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170503120310_remove_users_authorized_projects_populated.rb b/db/post_migrate/20170503120310_remove_users_authorized_projects_populated.rb
index 1b44334395f..891ce44f60a 100644
--- a/db/post_migrate/20170503120310_remove_users_authorized_projects_populated.rb
+++ b/db/post_migrate/20170503120310_remove_users_authorized_projects_populated.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveUsersAuthorizedProjectsPopulated < ActiveRecord::Migration
+class RemoveUsersAuthorizedProjectsPopulated < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20170508170547_add_head_pipeline_for_each_merge_request.rb b/db/post_migrate/20170508170547_add_head_pipeline_for_each_merge_request.rb
index 5df3ab71648..6e7365f4c56 100644
--- a/db/post_migrate/20170508170547_add_head_pipeline_for_each_merge_request.rb
+++ b/db/post_migrate/20170508170547_add_head_pipeline_for_each_merge_request.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class AddHeadPipelineForEachMergeRequest < ActiveRecord::Migration
+class AddHeadPipelineForEachMergeRequest < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170510101043_add_foreign_key_on_pipeline_schedule_owner.rb b/db/post_migrate/20170510101043_add_foreign_key_on_pipeline_schedule_owner.rb
index 6a870f08e89..85586aecd54 100644
--- a/db/post_migrate/20170510101043_add_foreign_key_on_pipeline_schedule_owner.rb
+++ b/db/post_migrate/20170510101043_add_foreign_key_on_pipeline_schedule_owner.rb
@@ -1,4 +1,4 @@
-class AddForeignKeyOnPipelineScheduleOwner < ActiveRecord::Migration
+class AddForeignKeyOnPipelineScheduleOwner < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170511100900_cleanup_rename_web_hooks_build_events_to_job_events.rb b/db/post_migrate/20170511100900_cleanup_rename_web_hooks_build_events_to_job_events.rb
index 281be90163a..b4a3db65607 100644
--- a/db/post_migrate/20170511100900_cleanup_rename_web_hooks_build_events_to_job_events.rb
+++ b/db/post_migrate/20170511100900_cleanup_rename_web_hooks_build_events_to_job_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupRenameWebHooksBuildEventsToJobEvents < ActiveRecord::Migration
+class CleanupRenameWebHooksBuildEventsToJobEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170511101000_cleanup_rename_services_build_events_to_job_events.rb b/db/post_migrate/20170511101000_cleanup_rename_services_build_events_to_job_events.rb
index 5d26df5688f..65342747321 100644
--- a/db/post_migrate/20170511101000_cleanup_rename_services_build_events_to_job_events.rb
+++ b/db/post_migrate/20170511101000_cleanup_rename_services_build_events_to_job_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupRenameServicesBuildEventsToJobEvents < ActiveRecord::Migration
+class CleanupRenameServicesBuildEventsToJobEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170516165238_cleanup_trigger_for_issues.rb b/db/post_migrate/20170516165238_cleanup_trigger_for_issues.rb
index 378fe5603c3..affeba52250 100644
--- a/db/post_migrate/20170516165238_cleanup_trigger_for_issues.rb
+++ b/db/post_migrate/20170516165238_cleanup_trigger_for_issues.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupTriggerForIssues < ActiveRecord::Migration
+class CleanupTriggerForIssues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20170516181025_add_constraints_to_issue_assignees_table.rb b/db/post_migrate/20170516181025_add_constraints_to_issue_assignees_table.rb
index 6fa573c5b49..03456a31b0d 100644
--- a/db/post_migrate/20170516181025_add_constraints_to_issue_assignees_table.rb
+++ b/db/post_migrate/20170516181025_add_constraints_to_issue_assignees_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddConstraintsToIssueAssigneesTable < ActiveRecord::Migration
+class AddConstraintsToIssueAssigneesTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20170518200835_rename_users_with_renamed_namespace.rb b/db/post_migrate/20170518200835_rename_users_with_renamed_namespace.rb
index 17ad7de065d..4ba78727cc3 100644
--- a/db/post_migrate/20170518200835_rename_users_with_renamed_namespace.rb
+++ b/db/post_migrate/20170518200835_rename_users_with_renamed_namespace.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameUsersWithRenamedNamespace < ActiveRecord::Migration
+class RenameUsersWithRenamedNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170518231126_fix_wrongly_renamed_routes.rb b/db/post_migrate/20170518231126_fix_wrongly_renamed_routes.rb
index 3e952980866..28a2a2e01bf 100644
--- a/db/post_migrate/20170518231126_fix_wrongly_renamed_routes.rb
+++ b/db/post_migrate/20170518231126_fix_wrongly_renamed_routes.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class FixWronglyRenamedRoutes < ActiveRecord::Migration
+class FixWronglyRenamedRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::RenameReservedPathsMigration::V1
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170523073948_remove_assignee_id_from_issue.rb b/db/post_migrate/20170523073948_remove_assignee_id_from_issue.rb
index 006d17b4d62..d75bbb2f612 100644
--- a/db/post_migrate/20170523073948_remove_assignee_id_from_issue.rb
+++ b/db/post_migrate/20170523073948_remove_assignee_id_from_issue.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveAssigneeIdFromIssue < ActiveRecord::Migration
+class RemoveAssigneeIdFromIssue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20170523083112_migrate_old_artifacts.rb b/db/post_migrate/20170523083112_migrate_old_artifacts.rb
index 3a77b9751d3..55e155c7619 100644
--- a/db/post_migrate/20170523083112_migrate_old_artifacts.rb
+++ b/db/post_migrate/20170523083112_migrate_old_artifacts.rb
@@ -1,4 +1,4 @@
-class MigrateOldArtifacts < ActiveRecord::Migration
+class MigrateOldArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170525140254_rename_all_reserved_paths_again.rb b/db/post_migrate/20170525140254_rename_all_reserved_paths_again.rb
index c996ddbec84..59b8daaffdf 100644
--- a/db/post_migrate/20170525140254_rename_all_reserved_paths_again.rb
+++ b/db/post_migrate/20170525140254_rename_all_reserved_paths_again.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RenameAllReservedPathsAgain < ActiveRecord::Migration
+class RenameAllReservedPathsAgain < ActiveRecord::Migration[4.2]
   include Gitlab::Database::RenameReservedPathsMigration::V1
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170526185842_migrate_pipeline_stages.rb b/db/post_migrate/20170526185842_migrate_pipeline_stages.rb
index 736aff77f02..53743fc16e6 100644
--- a/db/post_migrate/20170526185842_migrate_pipeline_stages.rb
+++ b/db/post_migrate/20170526185842_migrate_pipeline_stages.rb
@@ -1,4 +1,4 @@
-class MigratePipelineStages < ActiveRecord::Migration
+class MigratePipelineStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170526185858_create_index_in_pipeline_stages.rb b/db/post_migrate/20170526185858_create_index_in_pipeline_stages.rb
index ec9ff33b6b7..dc7b1d6d026 100644
--- a/db/post_migrate/20170526185858_create_index_in_pipeline_stages.rb
+++ b/db/post_migrate/20170526185858_create_index_in_pipeline_stages.rb
@@ -1,4 +1,4 @@
-class CreateIndexInPipelineStages < ActiveRecord::Migration
+class CreateIndexInPipelineStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170526185901_remove_stage_id_index_from_builds.rb b/db/post_migrate/20170526185901_remove_stage_id_index_from_builds.rb
index 3879cf9133b..de473e7bb91 100644
--- a/db/post_migrate/20170526185901_remove_stage_id_index_from_builds.rb
+++ b/db/post_migrate/20170526185901_remove_stage_id_index_from_builds.rb
@@ -1,4 +1,4 @@
-class RemoveStageIdIndexFromBuilds < ActiveRecord::Migration
+class RemoveStageIdIndexFromBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170526185921_migrate_build_stage_reference.rb b/db/post_migrate/20170526185921_migrate_build_stage_reference.rb
index 98c32d8284c..a9b392314fa 100644
--- a/db/post_migrate/20170526185921_migrate_build_stage_reference.rb
+++ b/db/post_migrate/20170526185921_migrate_build_stage_reference.rb
@@ -1,4 +1,4 @@
-class MigrateBuildStageReference < ActiveRecord::Migration
+class MigrateBuildStageReference < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170526190000_migrate_build_stage_reference_again.rb b/db/post_migrate/20170526190000_migrate_build_stage_reference_again.rb
index a7bfba0ab2b..01b6cf3a158 100644
--- a/db/post_migrate/20170526190000_migrate_build_stage_reference_again.rb
+++ b/db/post_migrate/20170526190000_migrate_build_stage_reference_again.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class MigrateBuildStageReferenceAgain < ActiveRecord::Migration
+class MigrateBuildStageReferenceAgain < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170531203055_cleanup_users_ldap_email_rename.rb b/db/post_migrate/20170531203055_cleanup_users_ldap_email_rename.rb
index a70e3985005..3d75c7e3eaf 100644
--- a/db/post_migrate/20170531203055_cleanup_users_ldap_email_rename.rb
+++ b/db/post_migrate/20170531203055_cleanup_users_ldap_email_rename.rb
@@ -1,4 +1,4 @@
-class CleanupUsersLdapEmailRename < ActiveRecord::Migration
+class CleanupUsersLdapEmailRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170606202615_move_appearance_to_system_dir.rb b/db/post_migrate/20170606202615_move_appearance_to_system_dir.rb
index 07935ab8a52..fb9ac8d6daf 100644
--- a/db/post_migrate/20170606202615_move_appearance_to_system_dir.rb
+++ b/db/post_migrate/20170606202615_move_appearance_to_system_dir.rb
@@ -1,4 +1,4 @@
-class MoveAppearanceToSystemDir < ActiveRecord::Migration
+class MoveAppearanceToSystemDir < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/post_migrate/20170607121233_convert_custom_notification_settings_to_columns.rb b/db/post_migrate/20170607121233_convert_custom_notification_settings_to_columns.rb
index 9abda6a1d73..8ff26130cba 100644
--- a/db/post_migrate/20170607121233_convert_custom_notification_settings_to_columns.rb
+++ b/db/post_migrate/20170607121233_convert_custom_notification_settings_to_columns.rb
@@ -1,4 +1,4 @@
-class ConvertCustomNotificationSettingsToColumns < ActiveRecord::Migration
+class ConvertCustomNotificationSettingsToColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170609183112_remove_position_from_issuables.rb b/db/post_migrate/20170609183112_remove_position_from_issuables.rb
index 4caaa2e83e8..edad0a502b4 100644
--- a/db/post_migrate/20170609183112_remove_position_from_issuables.rb
+++ b/db/post_migrate/20170609183112_remove_position_from_issuables.rb
@@ -1,4 +1,4 @@
-class RemovePositionFromIssuables < ActiveRecord::Migration
+class RemovePositionFromIssuables < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
diff --git a/db/post_migrate/20170612071012_move_personal_snippets_files.rb b/db/post_migrate/20170612071012_move_personal_snippets_files.rb
index c735dc67f44..d32d92637fa 100644
--- a/db/post_migrate/20170612071012_move_personal_snippets_files.rb
+++ b/db/post_migrate/20170612071012_move_personal_snippets_files.rb
@@ -1,6 +1,6 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
-class MovePersonalSnippetsFiles < ActiveRecord::Migration
+class MovePersonalSnippetsFiles < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/post_migrate/20170613111224_clean_appearance_symlinks.rb b/db/post_migrate/20170613111224_clean_appearance_symlinks.rb
index 17849b78ceb..14511bff3db 100644
--- a/db/post_migrate/20170613111224_clean_appearance_symlinks.rb
+++ b/db/post_migrate/20170613111224_clean_appearance_symlinks.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanAppearanceSymlinks < ActiveRecord::Migration
+class CleanAppearanceSymlinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/post_migrate/20170621102400_add_stage_id_index_to_builds.rb b/db/post_migrate/20170621102400_add_stage_id_index_to_builds.rb
index ac61b5c84a8..cca9b488547 100644
--- a/db/post_migrate/20170621102400_add_stage_id_index_to_builds.rb
+++ b/db/post_migrate/20170621102400_add_stage_id_index_to_builds.rb
@@ -1,4 +1,4 @@
-class AddStageIdIndexToBuilds < ActiveRecord::Migration
+class AddStageIdIndexToBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170627101016_schedule_event_migrations.rb b/db/post_migrate/20170627101016_schedule_event_migrations.rb
index 1e020d05f78..f026a86bc0f 100644
--- a/db/post_migrate/20170627101016_schedule_event_migrations.rb
+++ b/db/post_migrate/20170627101016_schedule_event_migrations.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ScheduleEventMigrations < ActiveRecord::Migration
+class ScheduleEventMigrations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170628080858_migrate_stage_id_reference_in_background.rb b/db/post_migrate/20170628080858_migrate_stage_id_reference_in_background.rb
index f31015d77a3..36aac3df071 100644
--- a/db/post_migrate/20170628080858_migrate_stage_id_reference_in_background.rb
+++ b/db/post_migrate/20170628080858_migrate_stage_id_reference_in_background.rb
@@ -1,4 +1,4 @@
-class MigrateStageIdReferenceInBackground < ActiveRecord::Migration
+class MigrateStageIdReferenceInBackground < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170629180131_cleanup_application_settings_signin_enabled_rename.rb b/db/post_migrate/20170629180131_cleanup_application_settings_signin_enabled_rename.rb
index 52a773ddfee..87268fb4b31 100644
--- a/db/post_migrate/20170629180131_cleanup_application_settings_signin_enabled_rename.rb
+++ b/db/post_migrate/20170629180131_cleanup_application_settings_signin_enabled_rename.rb
@@ -1,4 +1,4 @@
-class CleanupApplicationSettingsSigninEnabledRename < ActiveRecord::Migration
+class CleanupApplicationSettingsSigninEnabledRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170703130158_schedule_merge_request_diff_migrations.rb b/db/post_migrate/20170703130158_schedule_merge_request_diff_migrations.rb
index 17a9dc293f1..fd4b2859f7f 100644
--- a/db/post_migrate/20170703130158_schedule_merge_request_diff_migrations.rb
+++ b/db/post_migrate/20170703130158_schedule_merge_request_diff_migrations.rb
@@ -1,4 +1,4 @@
-class ScheduleMergeRequestDiffMigrations < ActiveRecord::Migration
+class ScheduleMergeRequestDiffMigrations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170711145558_migrate_stages_statuses.rb b/db/post_migrate/20170711145558_migrate_stages_statuses.rb
index 265f7317b9b..8ba69ea4dce 100644
--- a/db/post_migrate/20170711145558_migrate_stages_statuses.rb
+++ b/db/post_migrate/20170711145558_migrate_stages_statuses.rb
@@ -1,4 +1,4 @@
-class MigrateStagesStatuses < ActiveRecord::Migration
+class MigrateStagesStatuses < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170717111152_cleanup_move_system_upload_folder_symlink.rb b/db/post_migrate/20170717111152_cleanup_move_system_upload_folder_symlink.rb
index 3ae4406ff96..392c4f71532 100644
--- a/db/post_migrate/20170717111152_cleanup_move_system_upload_folder_symlink.rb
+++ b/db/post_migrate/20170717111152_cleanup_move_system_upload_folder_symlink.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupMoveSystemUploadFolderSymlink < ActiveRecord::Migration
+class CleanupMoveSystemUploadFolderSymlink < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170717150329_enqueue_migrate_system_uploads_to_new_folder.rb b/db/post_migrate/20170717150329_enqueue_migrate_system_uploads_to_new_folder.rb
index 87069dce006..fdd990ae2e5 100644
--- a/db/post_migrate/20170717150329_enqueue_migrate_system_uploads_to_new_folder.rb
+++ b/db/post_migrate/20170717150329_enqueue_migrate_system_uploads_to_new_folder.rb
@@ -1,4 +1,4 @@
-class EnqueueMigrateSystemUploadsToNewFolder < ActiveRecord::Migration
+class EnqueueMigrateSystemUploadsToNewFolder < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170719150301_merge_issuable_reopened_into_opened_state.rb b/db/post_migrate/20170719150301_merge_issuable_reopened_into_opened_state.rb
index acc0fc7a0ac..7af1d04f0cc 100644
--- a/db/post_migrate/20170719150301_merge_issuable_reopened_into_opened_state.rb
+++ b/db/post_migrate/20170719150301_merge_issuable_reopened_into_opened_state.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MergeIssuableReopenedIntoOpenedState < ActiveRecord::Migration
+class MergeIssuableReopenedIntoOpenedState < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170728101014_remove_events_from_notification_settings.rb b/db/post_migrate/20170728101014_remove_events_from_notification_settings.rb
index cd533391d8d..f1b0a1daec5 100644
--- a/db/post_migrate/20170728101014_remove_events_from_notification_settings.rb
+++ b/db/post_migrate/20170728101014_remove_events_from_notification_settings.rb
@@ -1,4 +1,4 @@
-class RemoveEventsFromNotificationSettings < ActiveRecord::Migration
+class RemoveEventsFromNotificationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170803090603_calculate_conv_dev_index_percentages.rb b/db/post_migrate/20170803090603_calculate_conv_dev_index_percentages.rb
index 9af76c94bf3..a148586ca89 100644
--- a/db/post_migrate/20170803090603_calculate_conv_dev_index_percentages.rb
+++ b/db/post_migrate/20170803090603_calculate_conv_dev_index_percentages.rb
@@ -1,4 +1,4 @@
-class CalculateConvDevIndexPercentages < ActiveRecord::Migration
+class CalculateConvDevIndexPercentages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/post_migrate/20170807160457_remove_locked_at_column_from_merge_requests.rb b/db/post_migrate/20170807160457_remove_locked_at_column_from_merge_requests.rb
index ea3d1fb3e02..6dc49211e5a 100644
--- a/db/post_migrate/20170807160457_remove_locked_at_column_from_merge_requests.rb
+++ b/db/post_migrate/20170807160457_remove_locked_at_column_from_merge_requests.rb
@@ -1,4 +1,4 @@
-class RemoveLockedAtColumnFromMergeRequests < ActiveRecord::Migration
+class RemoveLockedAtColumnFromMergeRequests < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/post_migrate/20170807190736_move_personal_snippet_files_into_correct_folder.rb b/db/post_migrate/20170807190736_move_personal_snippet_files_into_correct_folder.rb
index e3d2446b897..8341ac39c25 100644
--- a/db/post_migrate/20170807190736_move_personal_snippet_files_into_correct_folder.rb
+++ b/db/post_migrate/20170807190736_move_personal_snippet_files_into_correct_folder.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MovePersonalSnippetFilesIntoCorrectFolder < ActiveRecord::Migration
+class MovePersonalSnippetFilesIntoCorrectFolder < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!
 
diff --git a/db/post_migrate/20170815060945_remove_duplicate_mr_events.rb b/db/post_migrate/20170815060945_remove_duplicate_mr_events.rb
index 6132b553177..fdc126b8fd6 100644
--- a/db/post_migrate/20170815060945_remove_duplicate_mr_events.rb
+++ b/db/post_migrate/20170815060945_remove_duplicate_mr_events.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDuplicateMrEvents < ActiveRecord::Migration
+class RemoveDuplicateMrEvents < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   DOWNTIME = false
 
diff --git a/db/post_migrate/20170816102555_cleanup_nonexisting_namespace_pending_delete_projects.rb b/db/post_migrate/20170816102555_cleanup_nonexisting_namespace_pending_delete_projects.rb
index 3f085c17133..27656fd926d 100644
--- a/db/post_migrate/20170816102555_cleanup_nonexisting_namespace_pending_delete_projects.rb
+++ b/db/post_migrate/20170816102555_cleanup_nonexisting_namespace_pending_delete_projects.rb
@@ -1,7 +1,7 @@
 # Follow up of CleanupNamespacelessPendingDeleteProjects and it cleans
 # all projects with `pending_delete = true` and for which the
 # namespace no longer exists.
-class CleanupNonexistingNamespacePendingDeleteProjects < ActiveRecord::Migration
+class CleanupNonexistingNamespacePendingDeleteProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170822101017_migrate_pipeline_sidekiq_queues.rb b/db/post_migrate/20170822101017_migrate_pipeline_sidekiq_queues.rb
index 8441cfe7968..825bc9250bd 100644
--- a/db/post_migrate/20170822101017_migrate_pipeline_sidekiq_queues.rb
+++ b/db/post_migrate/20170822101017_migrate_pipeline_sidekiq_queues.rb
@@ -1,4 +1,4 @@
-class MigratePipelineSidekiqQueues < ActiveRecord::Migration
+class MigratePipelineSidekiqQueues < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170828170502_post_deploy_migrate_user_external_mail_data.rb b/db/post_migrate/20170828170502_post_deploy_migrate_user_external_mail_data.rb
index fd1437b07f5..533155aeb7a 100644
--- a/db/post_migrate/20170828170502_post_deploy_migrate_user_external_mail_data.rb
+++ b/db/post_migrate/20170828170502_post_deploy_migrate_user_external_mail_data.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PostDeployMigrateUserExternalMailData < ActiveRecord::Migration
+class PostDeployMigrateUserExternalMailData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170828170513_remove_user_email_provider_column.rb b/db/post_migrate/20170828170513_remove_user_email_provider_column.rb
index 570f2b3772a..bfc8aede540 100644
--- a/db/post_migrate/20170828170513_remove_user_email_provider_column.rb
+++ b/db/post_migrate/20170828170513_remove_user_email_provider_column.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveUserEmailProviderColumn < ActiveRecord::Migration
+class RemoveUserEmailProviderColumn < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170828170516_remove_user_external_mail_columns.rb b/db/post_migrate/20170828170516_remove_user_external_mail_columns.rb
index bb81dc682b3..0104955e5c8 100644
--- a/db/post_migrate/20170828170516_remove_user_external_mail_columns.rb
+++ b/db/post_migrate/20170828170516_remove_user_external_mail_columns.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveUserExternalMailColumns < ActiveRecord::Migration
+class RemoveUserExternalMailColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170830084744_destroy_gpg_signatures.rb b/db/post_migrate/20170830084744_destroy_gpg_signatures.rb
index b04d36f6537..2945eb9fde6 100644
--- a/db/post_migrate/20170830084744_destroy_gpg_signatures.rb
+++ b/db/post_migrate/20170830084744_destroy_gpg_signatures.rb
@@ -1,4 +1,4 @@
-class DestroyGpgSignatures < ActiveRecord::Migration
+class DestroyGpgSignatures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/post_migrate/20170830150306_drop_events_for_migration_table.rb b/db/post_migrate/20170830150306_drop_events_for_migration_table.rb
index 69a612ead40..3538b52b004 100644
--- a/db/post_migrate/20170830150306_drop_events_for_migration_table.rb
+++ b/db/post_migrate/20170830150306_drop_events_for_migration_table.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class DropEventsForMigrationTable < ActiveRecord::Migration
+class DropEventsForMigrationTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170831195038_remove_valid_signature_from_gpg_signatures.rb b/db/post_migrate/20170831195038_remove_valid_signature_from_gpg_signatures.rb
index 9b6745e33d9..8e264c1ab41 100644
--- a/db/post_migrate/20170831195038_remove_valid_signature_from_gpg_signatures.rb
+++ b/db/post_migrate/20170831195038_remove_valid_signature_from_gpg_signatures.rb
@@ -1,4 +1,4 @@
-class RemoveValidSignatureFromGpgSignatures < ActiveRecord::Migration
+class RemoveValidSignatureFromGpgSignatures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/post_migrate/20170907170235_delete_conflicting_redirect_routes.rb b/db/post_migrate/20170907170235_delete_conflicting_redirect_routes.rb
index 033019c398e..95abf2474dd 100644
--- a/db/post_migrate/20170907170235_delete_conflicting_redirect_routes.rb
+++ b/db/post_migrate/20170907170235_delete_conflicting_redirect_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class DeleteConflictingRedirectRoutes < ActiveRecord::Migration
+class DeleteConflictingRedirectRoutes < ActiveRecord::Migration[4.2]
   def up
     # No-op.
     # See https://gitlab.com/gitlab-com/infrastructure/issues/3460#note_53223252
diff --git a/db/post_migrate/20170913180600_fix_projects_without_project_feature.rb b/db/post_migrate/20170913180600_fix_projects_without_project_feature.rb
index bfa9ad80c7d..bbc624ac7c0 100644
--- a/db/post_migrate/20170913180600_fix_projects_without_project_feature.rb
+++ b/db/post_migrate/20170913180600_fix_projects_without_project_feature.rb
@@ -1,4 +1,4 @@
-class FixProjectsWithoutProjectFeature < ActiveRecord::Migration
+class FixProjectsWithoutProjectFeature < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
diff --git a/db/post_migrate/20170921101004_normalize_ldap_extern_uids.rb b/db/post_migrate/20170921101004_normalize_ldap_extern_uids.rb
index 2230bb0e53c..9080acee1d6 100644
--- a/db/post_migrate/20170921101004_normalize_ldap_extern_uids.rb
+++ b/db/post_migrate/20170921101004_normalize_ldap_extern_uids.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class NormalizeLdapExternUids < ActiveRecord::Migration
+class NormalizeLdapExternUids < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb b/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb
index 5732cb85ea5..9b675a51725 100644
--- a/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb
+++ b/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb
@@ -1,4 +1,4 @@
-class ScheduleMergeRequestDiffMigrationsTakeTwo < ActiveRecord::Migration
+class ScheduleMergeRequestDiffMigrationsTakeTwo < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170927112318_update_legacy_diff_notes_type_for_import.rb b/db/post_migrate/20170927112318_update_legacy_diff_notes_type_for_import.rb
index b040c81b316..83c21c203e0 100644
--- a/db/post_migrate/20170927112318_update_legacy_diff_notes_type_for_import.rb
+++ b/db/post_migrate/20170927112318_update_legacy_diff_notes_type_for_import.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class UpdateLegacyDiffNotesTypeForImport < ActiveRecord::Migration
+class UpdateLegacyDiffNotesTypeForImport < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20170927112319_update_notes_type_for_import.rb b/db/post_migrate/20170927112319_update_notes_type_for_import.rb
index 5a400c71b02..8c691de3192 100644
--- a/db/post_migrate/20170927112319_update_notes_type_for_import.rb
+++ b/db/post_migrate/20170927112319_update_notes_type_for_import.rb
@@ -1,5 +1,5 @@
 # rubocop:disable Migration/UpdateLargeTable
-class UpdateNotesTypeForImport < ActiveRecord::Migration
+class UpdateNotesTypeForImport < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171005130944_schedule_create_gpg_key_subkeys_from_gpg_keys.rb b/db/post_migrate/20171005130944_schedule_create_gpg_key_subkeys_from_gpg_keys.rb
index 467c584c2e0..e49a70f902c 100644
--- a/db/post_migrate/20171005130944_schedule_create_gpg_key_subkeys_from_gpg_keys.rb
+++ b/db/post_migrate/20171005130944_schedule_create_gpg_key_subkeys_from_gpg_keys.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ScheduleCreateGpgKeySubkeysFromGpgKeys < ActiveRecord::Migration
+class ScheduleCreateGpgKeySubkeysFromGpgKeys < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171012150314_remove_user_authentication_token.rb b/db/post_migrate/20171012150314_remove_user_authentication_token.rb
index d0f3aa06e98..9313986ce85 100644
--- a/db/post_migrate/20171012150314_remove_user_authentication_token.rb
+++ b/db/post_migrate/20171012150314_remove_user_authentication_token.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveUserAuthenticationToken < ActiveRecord::Migration
+class RemoveUserAuthenticationToken < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171013104327_migrate_gcp_clusters_to_new_clusters_architectures.rb b/db/post_migrate/20171013104327_migrate_gcp_clusters_to_new_clusters_architectures.rb
index 28cd0f70cc2..9c90aa611a4 100644
--- a/db/post_migrate/20171013104327_migrate_gcp_clusters_to_new_clusters_architectures.rb
+++ b/db/post_migrate/20171013104327_migrate_gcp_clusters_to_new_clusters_architectures.rb
@@ -1,4 +1,4 @@
-class MigrateGcpClustersToNewClustersArchitectures < ActiveRecord::Migration
+class MigrateGcpClustersToNewClustersArchitectures < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   class GcpCluster < ActiveRecord::Base
diff --git a/db/post_migrate/20171026082505_schedule_merge_request_latest_merge_request_diff_id_migrations.rb b/db/post_migrate/20171026082505_schedule_merge_request_latest_merge_request_diff_id_migrations.rb
index 7a63382cc6d..764561de997 100644
--- a/db/post_migrate/20171026082505_schedule_merge_request_latest_merge_request_diff_id_migrations.rb
+++ b/db/post_migrate/20171026082505_schedule_merge_request_latest_merge_request_diff_id_migrations.rb
@@ -1,4 +1,4 @@
-class ScheduleMergeRequestLatestMergeRequestDiffIdMigrations < ActiveRecord::Migration
+class ScheduleMergeRequestLatestMergeRequestDiffIdMigrations < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171101134435_remove_ref_fetched_from_merge_requests.rb b/db/post_migrate/20171101134435_remove_ref_fetched_from_merge_requests.rb
index 4e8f495d65d..e6a5ffc8649 100644
--- a/db/post_migrate/20171101134435_remove_ref_fetched_from_merge_requests.rb
+++ b/db/post_migrate/20171101134435_remove_ref_fetched_from_merge_requests.rb
@@ -1,4 +1,4 @@
-class RemoveRefFetchedFromMergeRequests < ActiveRecord::Migration
+class RemoveRefFetchedFromMergeRequests < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20171103140253_track_untracked_uploads.rb b/db/post_migrate/20171103140253_track_untracked_uploads.rb
index 548a94d2d38..6891ef5ba12 100644
--- a/db/post_migrate/20171103140253_track_untracked_uploads.rb
+++ b/db/post_migrate/20171103140253_track_untracked_uploads.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class TrackUntrackedUploads < ActiveRecord::Migration
+class TrackUntrackedUploads < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/post_migrate/20171106133144_cleanup_application_settings_password_authentication_enabled_rename.rb b/db/post_migrate/20171106133144_cleanup_application_settings_password_authentication_enabled_rename.rb
index d54ff3d5f5e..4a01bf75f50 100644
--- a/db/post_migrate/20171106133144_cleanup_application_settings_password_authentication_enabled_rename.rb
+++ b/db/post_migrate/20171106133144_cleanup_application_settings_password_authentication_enabled_rename.rb
@@ -1,4 +1,4 @@
-class CleanupApplicationSettingsPasswordAuthenticationEnabledRename < ActiveRecord::Migration
+class CleanupApplicationSettingsPasswordAuthenticationEnabledRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171106154015_remove_issues_branch_name.rb b/db/post_migrate/20171106154015_remove_issues_branch_name.rb
index 3d08225c96d..4e71aa2f163 100644
--- a/db/post_migrate/20171106154015_remove_issues_branch_name.rb
+++ b/db/post_migrate/20171106154015_remove_issues_branch_name.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveIssuesBranchName < ActiveRecord::Migration
+class RemoveIssuesBranchName < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20171106180641_cleanup_add_timezone_to_issues_closed_at.rb b/db/post_migrate/20171106180641_cleanup_add_timezone_to_issues_closed_at.rb
index 53f376f216b..8187d3971fc 100644
--- a/db/post_migrate/20171106180641_cleanup_add_timezone_to_issues_closed_at.rb
+++ b/db/post_migrate/20171106180641_cleanup_add_timezone_to_issues_closed_at.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupAddTimezoneToIssuesClosedAt < ActiveRecord::Migration
+class CleanupAddTimezoneToIssuesClosedAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171114104051_remove_empty_fork_networks.rb b/db/post_migrate/20171114104051_remove_empty_fork_networks.rb
index 2fe99a1b9c1..76862cccf60 100644
--- a/db/post_migrate/20171114104051_remove_empty_fork_networks.rb
+++ b/db/post_migrate/20171114104051_remove_empty_fork_networks.rb
@@ -1,4 +1,4 @@
-class RemoveEmptyForkNetworks < ActiveRecord::Migration
+class RemoveEmptyForkNetworks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171121160421_remove_merge_request_diff_st_commits_and_st_diffs.rb b/db/post_migrate/20171121160421_remove_merge_request_diff_st_commits_and_st_diffs.rb
index 3a7b2a7fac0..93a97993f1f 100644
--- a/db/post_migrate/20171121160421_remove_merge_request_diff_st_commits_and_st_diffs.rb
+++ b/db/post_migrate/20171121160421_remove_merge_request_diff_st_commits_and_st_diffs.rb
@@ -1,4 +1,4 @@
-class RemoveMergeRequestDiffStCommitsAndStDiffs < ActiveRecord::Migration
+class RemoveMergeRequestDiffStCommitsAndStDiffs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171123101020_update_circuitbreaker_defaults.rb b/db/post_migrate/20171123101020_update_circuitbreaker_defaults.rb
index 8e1c9e6d6bb..ae954289291 100644
--- a/db/post_migrate/20171123101020_update_circuitbreaker_defaults.rb
+++ b/db/post_migrate/20171123101020_update_circuitbreaker_defaults.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class UpdateCircuitbreakerDefaults < ActiveRecord::Migration
+class UpdateCircuitbreakerDefaults < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171123101046_remove_old_circuitbreaker_config.rb b/db/post_migrate/20171123101046_remove_old_circuitbreaker_config.rb
index e646d4d3224..3f2c1b2170a 100644
--- a/db/post_migrate/20171123101046_remove_old_circuitbreaker_config.rb
+++ b/db/post_migrate/20171123101046_remove_old_circuitbreaker_config.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveOldCircuitbreakerConfig < ActiveRecord::Migration
+class RemoveOldCircuitbreakerConfig < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171124095655_add_index_on_merge_request_diffs_merge_request_id_and_id.rb b/db/post_migrate/20171124095655_add_index_on_merge_request_diffs_merge_request_id_and_id.rb
index 698df712c11..2c65a4ae4f5 100644
--- a/db/post_migrate/20171124095655_add_index_on_merge_request_diffs_merge_request_id_and_id.rb
+++ b/db/post_migrate/20171124095655_add_index_on_merge_request_diffs_merge_request_id_and_id.rb
@@ -1,4 +1,4 @@
-class AddIndexOnMergeRequestDiffsMergeRequestIdAndId < ActiveRecord::Migration
+class AddIndexOnMergeRequestDiffsMergeRequestIdAndId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb b/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb
index 038e4807000..efd3714d668 100644
--- a/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb
+++ b/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb
@@ -1,4 +1,4 @@
-class RemoveIndexOnMergeRequestDiffsMergeRequestDiffId < ActiveRecord::Migration
+class RemoveIndexOnMergeRequestDiffsMergeRequestDiffId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb b/db/post_migrate/20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb
index a957f107405..58ceefe3c97 100644
--- a/db/post_migrate/20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb
+++ b/db/post_migrate/20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb
@@ -1,4 +1,4 @@
-class MigrateKubernetesServiceToNewClustersArchitectures < ActiveRecord::Migration
+class MigrateKubernetesServiceToNewClustersArchitectures < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171124150326_reschedule_fork_network_creation.rb b/db/post_migrate/20171124150326_reschedule_fork_network_creation.rb
index 26f917d5a1e..8e320ea9e8d 100644
--- a/db/post_migrate/20171124150326_reschedule_fork_network_creation.rb
+++ b/db/post_migrate/20171124150326_reschedule_fork_network_creation.rb
@@ -1,4 +1,4 @@
-class RescheduleForkNetworkCreation < ActiveRecord::Migration
+class RescheduleForkNetworkCreation < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171128214150_schedule_populate_merge_request_metrics_with_events_data.rb b/db/post_migrate/20171128214150_schedule_populate_merge_request_metrics_with_events_data.rb
index 980f76e7d57..51441a36e4b 100644
--- a/db/post_migrate/20171128214150_schedule_populate_merge_request_metrics_with_events_data.rb
+++ b/db/post_migrate/20171128214150_schedule_populate_merge_request_metrics_with_events_data.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class SchedulePopulateMergeRequestMetricsWithEventsData < ActiveRecord::Migration
+class SchedulePopulateMergeRequestMetricsWithEventsData < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   BATCH_SIZE = 10_000
   MIGRATION = 'PopulateMergeRequestMetricsWithEventsData'
diff --git a/db/post_migrate/20171205190711_reschedule_fork_network_creation_caller.rb b/db/post_migrate/20171205190711_reschedule_fork_network_creation_caller.rb
index 30ff5173192..058f3a40817 100644
--- a/db/post_migrate/20171205190711_reschedule_fork_network_creation_caller.rb
+++ b/db/post_migrate/20171205190711_reschedule_fork_network_creation_caller.rb
@@ -1,4 +1,4 @@
-class RescheduleForkNetworkCreationCaller < ActiveRecord::Migration
+class RescheduleForkNetworkCreationCaller < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171207150300_remove_project_labels_group_id_copy.rb b/db/post_migrate/20171207150300_remove_project_labels_group_id_copy.rb
index 2f339172eeb..44273cebc9d 100644
--- a/db/post_migrate/20171207150300_remove_project_labels_group_id_copy.rb
+++ b/db/post_migrate/20171207150300_remove_project_labels_group_id_copy.rb
@@ -1,7 +1,7 @@
 # Copy of 20180202111106 - this one should run before 20171207150343 to fix issues related to
 # the removal of groups with labels.
 
-class RemoveProjectLabelsGroupIdCopy < ActiveRecord::Migration
+class RemoveProjectLabelsGroupIdCopy < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171207150343_remove_soft_removed_objects.rb b/db/post_migrate/20171207150343_remove_soft_removed_objects.rb
index 3109b6dbf8e..53707c67d36 100644
--- a/db/post_migrate/20171207150343_remove_soft_removed_objects.rb
+++ b/db/post_migrate/20171207150343_remove_soft_removed_objects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveSoftRemovedObjects < ActiveRecord::Migration
+class RemoveSoftRemovedObjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20171207150344_remove_deleted_at_columns.rb b/db/post_migrate/20171207150344_remove_deleted_at_columns.rb
index 154d7a1b926..5f1c70a2797 100644
--- a/db/post_migrate/20171207150344_remove_deleted_at_columns.rb
+++ b/db/post_migrate/20171207150344_remove_deleted_at_columns.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveDeletedAtColumns < ActiveRecord::Migration
+class RemoveDeletedAtColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171213160445_migrate_github_importer_advance_stage_sidekiq_queue.rb b/db/post_migrate/20171213160445_migrate_github_importer_advance_stage_sidekiq_queue.rb
index 149c28f1946..088c4b5d46b 100644
--- a/db/post_migrate/20171213160445_migrate_github_importer_advance_stage_sidekiq_queue.rb
+++ b/db/post_migrate/20171213160445_migrate_github_importer_advance_stage_sidekiq_queue.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class MigrateGithubImporterAdvanceStageSidekiqQueue < ActiveRecord::Migration
+class MigrateGithubImporterAdvanceStageSidekiqQueue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171215121205_post_populate_can_push_from_deploy_keys_projects.rb b/db/post_migrate/20171215121205_post_populate_can_push_from_deploy_keys_projects.rb
index 3a5850df3db..1c81e56db55 100644
--- a/db/post_migrate/20171215121205_post_populate_can_push_from_deploy_keys_projects.rb
+++ b/db/post_migrate/20171215121205_post_populate_can_push_from_deploy_keys_projects.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PostPopulateCanPushFromDeployKeysProjects < ActiveRecord::Migration
+class PostPopulateCanPushFromDeployKeysProjects < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171215121259_remove_can_push_from_keys.rb b/db/post_migrate/20171215121259_remove_can_push_from_keys.rb
index 0599811d986..fc4045a383d 100644
--- a/db/post_migrate/20171215121259_remove_can_push_from_keys.rb
+++ b/db/post_migrate/20171215121259_remove_can_push_from_keys.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveCanPushFromKeys < ActiveRecord::Migration
+class RemoveCanPushFromKeys < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171219121201_normalize_extern_uid_from_identities.rb b/db/post_migrate/20171219121201_normalize_extern_uid_from_identities.rb
index 286721a0894..45ef75fdb98 100644
--- a/db/post_migrate/20171219121201_normalize_extern_uid_from_identities.rb
+++ b/db/post_migrate/20171219121201_normalize_extern_uid_from_identities.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class NormalizeExternUidFromIdentities < ActiveRecord::Migration
+class NormalizeExternUidFromIdentities < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb b/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb
index eeecc7b1de0..6b5e6202688 100644
--- a/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb
+++ b/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 # rubocop:disable Migration/Datetime
-class ScheduleIssuesClosedAtTypeChange < ActiveRecord::Migration
+class ScheduleIssuesClosedAtTypeChange < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180104131052_schedule_set_confidential_note_events_on_webhooks.rb b/db/post_migrate/20180104131052_schedule_set_confidential_note_events_on_webhooks.rb
index fa51ac83619..0822aebc2c6 100644
--- a/db/post_migrate/20180104131052_schedule_set_confidential_note_events_on_webhooks.rb
+++ b/db/post_migrate/20180104131052_schedule_set_confidential_note_events_on_webhooks.rb
@@ -1,4 +1,4 @@
-class ScheduleSetConfidentialNoteEventsOnWebhooks < ActiveRecord::Migration
+class ScheduleSetConfidentialNoteEventsOnWebhooks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180119121225_remove_redundant_pipeline_stages.rb b/db/post_migrate/20180119121225_remove_redundant_pipeline_stages.rb
index 269f1287f91..0a2ea7bfb7b 100644
--- a/db/post_migrate/20180119121225_remove_redundant_pipeline_stages.rb
+++ b/db/post_migrate/20180119121225_remove_redundant_pipeline_stages.rb
@@ -1,4 +1,4 @@
-class RemoveRedundantPipelineStages < ActiveRecord::Migration
+class RemoveRedundantPipelineStages < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180122154930_schedule_set_confidential_note_events_on_services.rb b/db/post_migrate/20180122154930_schedule_set_confidential_note_events_on_services.rb
index a3ff9f1719e..98bbb34dda1 100644
--- a/db/post_migrate/20180122154930_schedule_set_confidential_note_events_on_services.rb
+++ b/db/post_migrate/20180122154930_schedule_set_confidential_note_events_on_services.rb
@@ -1,4 +1,4 @@
-class ScheduleSetConfidentialNoteEventsOnServices < ActiveRecord::Migration
+class ScheduleSetConfidentialNoteEventsOnServices < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180202111106_remove_project_labels_group_id.rb b/db/post_migrate/20180202111106_remove_project_labels_group_id.rb
index db7fd0d167d..31ec84f0d6a 100644
--- a/db/post_migrate/20180202111106_remove_project_labels_group_id.rb
+++ b/db/post_migrate/20180202111106_remove_project_labels_group_id.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveProjectLabelsGroupId < ActiveRecord::Migration
+class RemoveProjectLabelsGroupId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb b/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb
index 92c32feebf7..54b8a91fa47 100644
--- a/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb
+++ b/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb
@@ -1,4 +1,4 @@
-class ChangeAuthorIdToNotNullInTodos < ActiveRecord::Migration
+class ChangeAuthorIdToNotNullInTodos < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class Todo < ActiveRecord::Base
diff --git a/db/post_migrate/20180212101828_add_tmp_partial_null_index_to_builds.rb b/db/post_migrate/20180212101828_add_tmp_partial_null_index_to_builds.rb
index e55e2e6f888..f8badcac990 100644
--- a/db/post_migrate/20180212101828_add_tmp_partial_null_index_to_builds.rb
+++ b/db/post_migrate/20180212101828_add_tmp_partial_null_index_to_builds.rb
@@ -1,4 +1,4 @@
-class AddTmpPartialNullIndexToBuilds < ActiveRecord::Migration
+class AddTmpPartialNullIndexToBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/post_migrate/20180212101928_schedule_build_stage_migration.rb b/db/post_migrate/20180212101928_schedule_build_stage_migration.rb
index 0f61fa81832..2445ab1a130 100644
--- a/db/post_migrate/20180212101928_schedule_build_stage_migration.rb
+++ b/db/post_migrate/20180212101928_schedule_build_stage_migration.rb
@@ -1,4 +1,4 @@
-class ScheduleBuildStageMigration < ActiveRecord::Migration
+class ScheduleBuildStageMigration < ActiveRecord::Migration[4.2]
   ##
   # This migration has been rescheduled to run again, see
   # `20180405101928_reschedule_builds_stages_migration.rb`
diff --git a/db/post_migrate/20180212102028_remove_tmp_partial_null_index_from_builds.rb b/db/post_migrate/20180212102028_remove_tmp_partial_null_index_from_builds.rb
index ed7b1fc72f4..2444df881b8 100644
--- a/db/post_migrate/20180212102028_remove_tmp_partial_null_index_from_builds.rb
+++ b/db/post_migrate/20180212102028_remove_tmp_partial_null_index_from_builds.rb
@@ -1,4 +1,4 @@
-class RemoveTmpPartialNullIndexFromBuilds < ActiveRecord::Migration
+class RemoveTmpPartialNullIndexFromBuilds < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/post_migrate/20180216121020_fill_pages_domain_verification_code.rb b/db/post_migrate/20180216121020_fill_pages_domain_verification_code.rb
index d423673d2a5..dae43ee14df 100644
--- a/db/post_migrate/20180216121020_fill_pages_domain_verification_code.rb
+++ b/db/post_migrate/20180216121020_fill_pages_domain_verification_code.rb
@@ -1,4 +1,4 @@
-class FillPagesDomainVerificationCode < ActiveRecord::Migration
+class FillPagesDomainVerificationCode < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   class PagesDomain < ActiveRecord::Base
diff --git a/db/post_migrate/20180216121030_enqueue_verify_pages_domain_workers.rb b/db/post_migrate/20180216121030_enqueue_verify_pages_domain_workers.rb
index bf9bf4e660f..d776fb85f00 100644
--- a/db/post_migrate/20180216121030_enqueue_verify_pages_domain_workers.rb
+++ b/db/post_migrate/20180216121030_enqueue_verify_pages_domain_workers.rb
@@ -1,4 +1,4 @@
-class EnqueueVerifyPagesDomainWorkers < ActiveRecord::Migration
+class EnqueueVerifyPagesDomainWorkers < ActiveRecord::Migration[4.2]
   class PagesDomain < ActiveRecord::Base
     include EachBatch
   end
diff --git a/db/post_migrate/20180220150310_remove_empty_extern_uid_auth0_identities.rb b/db/post_migrate/20180220150310_remove_empty_extern_uid_auth0_identities.rb
index 2d5a8617169..86ef333685e 100644
--- a/db/post_migrate/20180220150310_remove_empty_extern_uid_auth0_identities.rb
+++ b/db/post_migrate/20180220150310_remove_empty_extern_uid_auth0_identities.rb
@@ -1,4 +1,4 @@
-class RemoveEmptyExternUidAuth0Identities < ActiveRecord::Migration
+class RemoveEmptyExternUidAuth0Identities < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180223124427_build_user_interacted_projects_table.rb b/db/post_migrate/20180223124427_build_user_interacted_projects_table.rb
index 8c8dbb1a043..fa332fd5c70 100644
--- a/db/post_migrate/20180223124427_build_user_interacted_projects_table.rb
+++ b/db/post_migrate/20180223124427_build_user_interacted_projects_table.rb
@@ -1,7 +1,7 @@
 require_relative '../migrate/20180223120443_create_user_interacted_projects_table.rb'
 # rubocop:disable AddIndex
 # rubocop:disable AddConcurrentForeignKey
-class BuildUserInteractedProjectsTable < ActiveRecord::Migration
+class BuildUserInteractedProjectsTable < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
@@ -43,7 +43,7 @@ class BuildUserInteractedProjectsTable < ActiveRecord::Migration
     end
   end
 
-  class PostgresStrategy < ActiveRecord::Migration
+  class PostgresStrategy < ActiveRecord::Migration[4.2]
     include Gitlab::Database::MigrationHelpers
 
     BATCH_SIZE = 100_000
@@ -141,7 +141,7 @@ class BuildUserInteractedProjectsTable < ActiveRecord::Migration
     end
   end
 
-  class MysqlStrategy < ActiveRecord::Migration
+  class MysqlStrategy < ActiveRecord::Migration[4.2]
     include Gitlab::Database::MigrationHelpers
 
     def up
diff --git a/db/post_migrate/20180301084653_change_project_namespace_id_not_null.rb b/db/post_migrate/20180301084653_change_project_namespace_id_not_null.rb
index 0342372cbed..62a239b0e7c 100644
--- a/db/post_migrate/20180301084653_change_project_namespace_id_not_null.rb
+++ b/db/post_migrate/20180301084653_change_project_namespace_id_not_null.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class ChangeProjectNamespaceIdNotNull < ActiveRecord::Migration
+class ChangeProjectNamespaceIdNotNull < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   class Project < ActiveRecord::Base
diff --git a/db/post_migrate/20180305100050_remove_permanent_from_redirect_routes.rb b/db/post_migrate/20180305100050_remove_permanent_from_redirect_routes.rb
index aa19732ca1c..15c052da99b 100644
--- a/db/post_migrate/20180305100050_remove_permanent_from_redirect_routes.rb
+++ b/db/post_migrate/20180305100050_remove_permanent_from_redirect_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemovePermanentFromRedirectRoutes < ActiveRecord::Migration
+class RemovePermanentFromRedirectRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb b/db/post_migrate/20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb
index 0af1c3bc0a5..fc74f6f1712 100644
--- a/db/post_migrate/20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb
+++ b/db/post_migrate/20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb
@@ -1,4 +1,4 @@
-class MigrateCreateTraceArtifactSidekiqQueue < ActiveRecord::Migration
+class MigrateCreateTraceArtifactSidekiqQueue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180306164012_add_path_index_to_redirect_routes.rb b/db/post_migrate/20180306164012_add_path_index_to_redirect_routes.rb
index ca9212fae27..53918250b4c 100644
--- a/db/post_migrate/20180306164012_add_path_index_to_redirect_routes.rb
+++ b/db/post_migrate/20180306164012_add_path_index_to_redirect_routes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddPathIndexToRedirectRoutes < ActiveRecord::Migration
+class AddPathIndexToRedirectRoutes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20180307012445_migrate_update_head_pipeline_for_merge_request_sidekiq_queue.rb b/db/post_migrate/20180307012445_migrate_update_head_pipeline_for_merge_request_sidekiq_queue.rb
index 9728df6d409..372c04429c7 100644
--- a/db/post_migrate/20180307012445_migrate_update_head_pipeline_for_merge_request_sidekiq_queue.rb
+++ b/db/post_migrate/20180307012445_migrate_update_head_pipeline_for_merge_request_sidekiq_queue.rb
@@ -1,4 +1,4 @@
-class MigrateUpdateHeadPipelineForMergeRequestSidekiqQueue < ActiveRecord::Migration
+class MigrateUpdateHeadPipelineForMergeRequestSidekiqQueue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180405101928_reschedule_builds_stages_migration.rb b/db/post_migrate/20180405101928_reschedule_builds_stages_migration.rb
index c32123454f9..213d97b71f7 100644
--- a/db/post_migrate/20180405101928_reschedule_builds_stages_migration.rb
+++ b/db/post_migrate/20180405101928_reschedule_builds_stages_migration.rb
@@ -1,4 +1,4 @@
-class RescheduleBuildsStagesMigration < ActiveRecord::Migration
+class RescheduleBuildsStagesMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   ##
diff --git a/db/post_migrate/20180408143355_cleanup_users_rss_token_rename.rb b/db/post_migrate/20180408143355_cleanup_users_rss_token_rename.rb
index 3d77ff921c7..813603cb3ad 100644
--- a/db/post_migrate/20180408143355_cleanup_users_rss_token_rename.rb
+++ b/db/post_migrate/20180408143355_cleanup_users_rss_token_rename.rb
@@ -1,4 +1,4 @@
-class CleanupUsersRssTokenRename < ActiveRecord::Migration
+class CleanupUsersRssTokenRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!
diff --git a/db/post_migrate/20180409170809_populate_missing_project_ci_cd_settings.rb b/db/post_migrate/20180409170809_populate_missing_project_ci_cd_settings.rb
index 3b0fdb3aeea..0cda3d76a3d 100644
--- a/db/post_migrate/20180409170809_populate_missing_project_ci_cd_settings.rb
+++ b/db/post_migrate/20180409170809_populate_missing_project_ci_cd_settings.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PopulateMissingProjectCiCdSettings < ActiveRecord::Migration
+class PopulateMissingProjectCiCdSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180420080616_schedule_stages_index_migration.rb b/db/post_migrate/20180420080616_schedule_stages_index_migration.rb
index eb82f098639..2d72e75393f 100644
--- a/db/post_migrate/20180420080616_schedule_stages_index_migration.rb
+++ b/db/post_migrate/20180420080616_schedule_stages_index_migration.rb
@@ -1,4 +1,4 @@
-class ScheduleStagesIndexMigration < ActiveRecord::Migration
+class ScheduleStagesIndexMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180424151928_fill_file_store.rb b/db/post_migrate/20180424151928_fill_file_store.rb
index 03d54dab250..45fa10c9550 100644
--- a/db/post_migrate/20180424151928_fill_file_store.rb
+++ b/db/post_migrate/20180424151928_fill_file_store.rb
@@ -1,4 +1,4 @@
-class FillFileStore < ActiveRecord::Migration
+class FillFileStore < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180430143705_backfill_runner_type_for_ci_runners_post_migrate.rb b/db/post_migrate/20180430143705_backfill_runner_type_for_ci_runners_post_migrate.rb
index 0e6ec46e5f0..ba1023866c5 100644
--- a/db/post_migrate/20180430143705_backfill_runner_type_for_ci_runners_post_migrate.rb
+++ b/db/post_migrate/20180430143705_backfill_runner_type_for_ci_runners_post_migrate.rb
@@ -1,4 +1,4 @@
-class BackfillRunnerTypeForCiRunnersPostMigrate < ActiveRecord::Migration
+class BackfillRunnerTypeForCiRunnersPostMigrate < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180502134117_migrate_import_attributes_data_from_projects_to_project_mirror_data.rb b/db/post_migrate/20180502134117_migrate_import_attributes_data_from_projects_to_project_mirror_data.rb
index 08d7d64a2c5..b82ee3569c9 100644
--- a/db/post_migrate/20180502134117_migrate_import_attributes_data_from_projects_to_project_mirror_data.rb
+++ b/db/post_migrate/20180502134117_migrate_import_attributes_data_from_projects_to_project_mirror_data.rb
@@ -1,4 +1,4 @@
-class MigrateImportAttributesDataFromProjectsToProjectMirrorData < ActiveRecord::Migration
+class MigrateImportAttributesDataFromProjectsToProjectMirrorData < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180507083701_set_minimal_project_build_timeout.rb b/db/post_migrate/20180507083701_set_minimal_project_build_timeout.rb
index fb9616f0c07..34edbb08bcf 100644
--- a/db/post_migrate/20180507083701_set_minimal_project_build_timeout.rb
+++ b/db/post_migrate/20180507083701_set_minimal_project_build_timeout.rb
@@ -1,4 +1,4 @@
-class SetMinimalProjectBuildTimeout < ActiveRecord::Migration
+class SetMinimalProjectBuildTimeout < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180511174224_add_unique_constraint_to_project_features_project_id.rb b/db/post_migrate/20180511174224_add_unique_constraint_to_project_features_project_id.rb
index 88a9f5f8256..a526001a91e 100644
--- a/db/post_migrate/20180511174224_add_unique_constraint_to_project_features_project_id.rb
+++ b/db/post_migrate/20180511174224_add_unique_constraint_to_project_features_project_id.rb
@@ -1,4 +1,4 @@
-class AddUniqueConstraintToProjectFeaturesProjectId < ActiveRecord::Migration
+class AddUniqueConstraintToProjectFeaturesProjectId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180512061621_add_not_null_constraint_to_project_features_project_id.rb b/db/post_migrate/20180512061621_add_not_null_constraint_to_project_features_project_id.rb
index 5a6d6ff4a10..e3abbc039e8 100644
--- a/db/post_migrate/20180512061621_add_not_null_constraint_to_project_features_project_id.rb
+++ b/db/post_migrate/20180512061621_add_not_null_constraint_to_project_features_project_id.rb
@@ -1,4 +1,4 @@
-class AddNotNullConstraintToProjectFeaturesProjectId < ActiveRecord::Migration
+class AddNotNullConstraintToProjectFeaturesProjectId < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180514161336_remove_gemnasium_service.rb b/db/post_migrate/20180514161336_remove_gemnasium_service.rb
index 6d7806e8daa..5842bde474c 100644
--- a/db/post_migrate/20180514161336_remove_gemnasium_service.rb
+++ b/db/post_migrate/20180514161336_remove_gemnasium_service.rb
@@ -1,4 +1,4 @@
-class RemoveGemnasiumService < ActiveRecord::Migration
+class RemoveGemnasiumService < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180521162137_migrate_remaining_mr_metrics_populating_background_migration.rb b/db/post_migrate/20180521162137_migrate_remaining_mr_metrics_populating_background_migration.rb
index 0282688fa40..39666a0cd2a 100644
--- a/db/post_migrate/20180521162137_migrate_remaining_mr_metrics_populating_background_migration.rb
+++ b/db/post_migrate/20180521162137_migrate_remaining_mr_metrics_populating_background_migration.rb
@@ -1,4 +1,4 @@
-class MigrateRemainingMrMetricsPopulatingBackgroundMigration < ActiveRecord::Migration
+class MigrateRemainingMrMetricsPopulatingBackgroundMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180523125103_cleanup_merge_requests_allow_maintainer_to_push_rename.rb b/db/post_migrate/20180523125103_cleanup_merge_requests_allow_maintainer_to_push_rename.rb
index 7eca7394f5f..b3b539fd156 100644
--- a/db/post_migrate/20180523125103_cleanup_merge_requests_allow_maintainer_to_push_rename.rb
+++ b/db/post_migrate/20180523125103_cleanup_merge_requests_allow_maintainer_to_push_rename.rb
@@ -1,4 +1,4 @@
-class CleanupMergeRequestsAllowMaintainerToPushRename < ActiveRecord::Migration
+class CleanupMergeRequestsAllowMaintainerToPushRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180529152628_schedule_to_archive_legacy_traces.rb b/db/post_migrate/20180529152628_schedule_to_archive_legacy_traces.rb
index 965cd3a8714..6246f6afab0 100644
--- a/db/post_migrate/20180529152628_schedule_to_archive_legacy_traces.rb
+++ b/db/post_migrate/20180529152628_schedule_to_archive_legacy_traces.rb
@@ -1,4 +1,4 @@
-class ScheduleToArchiveLegacyTraces < ActiveRecord::Migration
+class ScheduleToArchiveLegacyTraces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180603190921_migrate_object_storage_upload_sidekiq_queue.rb b/db/post_migrate/20180603190921_migrate_object_storage_upload_sidekiq_queue.rb
index 57bee6269b9..bc7c3eb5385 100644
--- a/db/post_migrate/20180603190921_migrate_object_storage_upload_sidekiq_queue.rb
+++ b/db/post_migrate/20180603190921_migrate_object_storage_upload_sidekiq_queue.rb
@@ -1,4 +1,4 @@
-class MigrateObjectStorageUploadSidekiqQueue < ActiveRecord::Migration
+class MigrateObjectStorageUploadSidekiqQueue < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180604123514_cleanup_stages_position_migration.rb b/db/post_migrate/20180604123514_cleanup_stages_position_migration.rb
index 5418f442e79..326cdfa27c3 100644
--- a/db/post_migrate/20180604123514_cleanup_stages_position_migration.rb
+++ b/db/post_migrate/20180604123514_cleanup_stages_position_migration.rb
@@ -1,4 +1,4 @@
-class CleanupStagesPositionMigration < ActiveRecord::Migration
+class CleanupStagesPositionMigration < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180608201435_cleanup_merge_requests_allow_collaboration_rename.rb b/db/post_migrate/20180608201435_cleanup_merge_requests_allow_collaboration_rename.rb
index 3f3edb8ea3d..5e892f8bace 100644
--- a/db/post_migrate/20180608201435_cleanup_merge_requests_allow_collaboration_rename.rb
+++ b/db/post_migrate/20180608201435_cleanup_merge_requests_allow_collaboration_rename.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class CleanupMergeRequestsAllowCollaborationRename < ActiveRecord::Migration
+class CleanupMergeRequestsAllowCollaborationRename < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb b/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb
index c4d2f5f61a0..73f6a3a2a43 100644
--- a/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb
+++ b/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb
@@ -1,4 +1,4 @@
-class EnqueueDeleteDiffFilesWorkers < ActiveRecord::Migration
+class EnqueueDeleteDiffFilesWorkers < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180629191052_add_partial_index_to_projects_for_last_repository_check_at.rb b/db/post_migrate/20180629191052_add_partial_index_to_projects_for_last_repository_check_at.rb
index a701d3678db..15c02cd77b8 100644
--- a/db/post_migrate/20180629191052_add_partial_index_to_projects_for_last_repository_check_at.rb
+++ b/db/post_migrate/20180629191052_add_partial_index_to_projects_for_last_repository_check_at.rb
@@ -1,4 +1,4 @@
-class AddPartialIndexToProjectsForLastRepositoryCheckAt < ActiveRecord::Migration
+class AddPartialIndexToProjectsForLastRepositoryCheckAt < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20180702120647_enqueue_fix_cross_project_label_links.rb b/db/post_migrate/20180702120647_enqueue_fix_cross_project_label_links.rb
index 59aa41adede..3d3d49e7564 100644
--- a/db/post_migrate/20180702120647_enqueue_fix_cross_project_label_links.rb
+++ b/db/post_migrate/20180702120647_enqueue_fix_cross_project_label_links.rb
@@ -1,4 +1,4 @@
-class EnqueueFixCrossProjectLabelLinks < ActiveRecord::Migration
+class EnqueueFixCrossProjectLabelLinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180704145007_update_project_indexes.rb b/db/post_migrate/20180704145007_update_project_indexes.rb
index 0e2601ad4fa..0a82f4535a0 100644
--- a/db/post_migrate/20180704145007_update_project_indexes.rb
+++ b/db/post_migrate/20180704145007_update_project_indexes.rb
@@ -1,7 +1,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class UpdateProjectIndexes < ActiveRecord::Migration
+class UpdateProjectIndexes < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180706223200_populate_site_statistics.rb b/db/post_migrate/20180706223200_populate_site_statistics.rb
index e78e9eb900a..896965b708f 100644
--- a/db/post_migrate/20180706223200_populate_site_statistics.rb
+++ b/db/post_migrate/20180706223200_populate_site_statistics.rb
@@ -1,4 +1,4 @@
-class PopulateSiteStatistics < ActiveRecord::Migration
+class PopulateSiteStatistics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180723130817_delete_inconsistent_internal_id_records.rb b/db/post_migrate/20180723130817_delete_inconsistent_internal_id_records.rb
index 3b9b95ec9ca..440868005bb 100644
--- a/db/post_migrate/20180723130817_delete_inconsistent_internal_id_records.rb
+++ b/db/post_migrate/20180723130817_delete_inconsistent_internal_id_records.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class DeleteInconsistentInternalIdRecords < ActiveRecord::Migration
+class DeleteInconsistentInternalIdRecords < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180809195358_migrate_null_wiki_access_levels.rb b/db/post_migrate/20180809195358_migrate_null_wiki_access_levels.rb
index 0a0a33299e4..363219da539 100644
--- a/db/post_migrate/20180809195358_migrate_null_wiki_access_levels.rb
+++ b/db/post_migrate/20180809195358_migrate_null_wiki_access_levels.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class MigrateNullWikiAccessLevels < ActiveRecord::Migration
+class MigrateNullWikiAccessLevels < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb b/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb
index 2dd711e9c10..6b0d1ef0d0c 100644
--- a/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb
+++ b/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb
@@ -1,4 +1,4 @@
-class MigrateLegacyArtifactsToJobArtifacts < ActiveRecord::Migration
+class MigrateLegacyArtifactsToJobArtifacts < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180816193530_rename_login_root_namespaces.rb b/db/post_migrate/20180816193530_rename_login_root_namespaces.rb
index 4ab1250473f..70db8f46d05 100644
--- a/db/post_migrate/20180816193530_rename_login_root_namespaces.rb
+++ b/db/post_migrate/20180816193530_rename_login_root_namespaces.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class RenameLoginRootNamespaces < ActiveRecord::Migration
+class RenameLoginRootNamespaces < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
   include Gitlab::Database::RenameReservedPathsMigration::V1
 
diff --git a/db/post_migrate/20180826111825_recalculate_site_statistics.rb b/db/post_migrate/20180826111825_recalculate_site_statistics.rb
index 741035a444f..6d27eca38e3 100644
--- a/db/post_migrate/20180826111825_recalculate_site_statistics.rb
+++ b/db/post_migrate/20180826111825_recalculate_site_statistics.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class RecalculateSiteStatistics < ActiveRecord::Migration
+class RecalculateSiteStatistics < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180906051323_remove_orphaned_label_links.rb b/db/post_migrate/20180906051323_remove_orphaned_label_links.rb
index b56b74f483e..a474aaf534c 100644
--- a/db/post_migrate/20180906051323_remove_orphaned_label_links.rb
+++ b/db/post_migrate/20180906051323_remove_orphaned_label_links.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class RemoveOrphanedLabelLinks < ActiveRecord::Migration
+class RemoveOrphanedLabelLinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180913051323_consume_remaining_diff_files_deletion_jobs.rb b/db/post_migrate/20180913051323_consume_remaining_diff_files_deletion_jobs.rb
index ed9422a3894..2c266a4695b 100644
--- a/db/post_migrate/20180913051323_consume_remaining_diff_files_deletion_jobs.rb
+++ b/db/post_migrate/20180913051323_consume_remaining_diff_files_deletion_jobs.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class ConsumeRemainingDiffFilesDeletionJobs < ActiveRecord::Migration
+class ConsumeRemainingDiffFilesDeletionJobs < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180913142237_schedule_digest_personal_access_tokens.rb b/db/post_migrate/20180913142237_schedule_digest_personal_access_tokens.rb
index 36be819b245..951cb3b088c 100644
--- a/db/post_migrate/20180913142237_schedule_digest_personal_access_tokens.rb
+++ b/db/post_migrate/20180913142237_schedule_digest_personal_access_tokens.rb
@@ -1,4 +1,4 @@
-class ScheduleDigestPersonalAccessTokens < ActiveRecord::Migration
+class ScheduleDigestPersonalAccessTokens < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180914162043_encrypt_web_hooks_columns.rb b/db/post_migrate/20180914162043_encrypt_web_hooks_columns.rb
index 05ec4864a9e..ef864f490bb 100644
--- a/db/post_migrate/20180914162043_encrypt_web_hooks_columns.rb
+++ b/db/post_migrate/20180914162043_encrypt_web_hooks_columns.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class EncryptWebHooksColumns < ActiveRecord::Migration
+class EncryptWebHooksColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180914201132_remove_sidekiq_throttling_from_application_settings.rb b/db/post_migrate/20180914201132_remove_sidekiq_throttling_from_application_settings.rb
index b3ed0d3f1e9..2c007ec395d 100644
--- a/db/post_migrate/20180914201132_remove_sidekiq_throttling_from_application_settings.rb
+++ b/db/post_migrate/20180914201132_remove_sidekiq_throttling_from_application_settings.rb
@@ -2,7 +2,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class RemoveSidekiqThrottlingFromApplicationSettings < ActiveRecord::Migration
+class RemoveSidekiqThrottlingFromApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20180916014356_populate_external_pipeline_source.rb b/db/post_migrate/20180916014356_populate_external_pipeline_source.rb
index 5577d05cf40..a3d2df1f2bd 100644
--- a/db/post_migrate/20180916014356_populate_external_pipeline_source.rb
+++ b/db/post_migrate/20180916014356_populate_external_pipeline_source.rb
@@ -3,7 +3,7 @@
 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class PopulateExternalPipelineSource < ActiveRecord::Migration
+class PopulateExternalPipelineSource < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20180917172041_remove_wikis_count_from_site_statistics.rb b/db/post_migrate/20180917172041_remove_wikis_count_from_site_statistics.rb
index 0a39abe3bdf..3b8300dabeb 100644
--- a/db/post_migrate/20180917172041_remove_wikis_count_from_site_statistics.rb
+++ b/db/post_migrate/20180917172041_remove_wikis_count_from_site_statistics.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class RemoveWikisCountFromSiteStatistics < ActiveRecord::Migration
+class RemoveWikisCountFromSiteStatistics < ActiveRecord::Migration[4.2]
   def change
     remove_column :site_statistics, :wikis_count, :integer
   end
diff --git a/db/post_migrate/20181008145341_steal_encrypt_columns.rb b/db/post_migrate/20181008145341_steal_encrypt_columns.rb
index c107ac72913..4102643ba13 100644
--- a/db/post_migrate/20181008145341_steal_encrypt_columns.rb
+++ b/db/post_migrate/20181008145341_steal_encrypt_columns.rb
@@ -1,4 +1,4 @@
-class StealEncryptColumns < ActiveRecord::Migration
+class StealEncryptColumns < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181008145359_remove_web_hooks_token_and_url.rb b/db/post_migrate/20181008145359_remove_web_hooks_token_and_url.rb
index 0c44bca5f1a..93e4458b795 100644
--- a/db/post_migrate/20181008145359_remove_web_hooks_token_and_url.rb
+++ b/db/post_migrate/20181008145359_remove_web_hooks_token_and_url.rb
@@ -1,4 +1,4 @@
-class RemoveWebHooksTokenAndUrl < ActiveRecord::Migration
+class RemoveWebHooksTokenAndUrl < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181008200441_remove_circuit_breaker.rb b/db/post_migrate/20181008200441_remove_circuit_breaker.rb
index 838addb7286..378692e8886 100644
--- a/db/post_migrate/20181008200441_remove_circuit_breaker.rb
+++ b/db/post_migrate/20181008200441_remove_circuit_breaker.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class RemoveCircuitBreaker < ActiveRecord::Migration
+class RemoveCircuitBreaker < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
diff --git a/db/post_migrate/20181013005024_remove_koding_from_application_settings.rb b/db/post_migrate/20181013005024_remove_koding_from_application_settings.rb
index 938a32e4e98..550ad94f4ab 100644
--- a/db/post_migrate/20181013005024_remove_koding_from_application_settings.rb
+++ b/db/post_migrate/20181013005024_remove_koding_from_application_settings.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class RemoveKodingFromApplicationSettings < ActiveRecord::Migration
+class RemoveKodingFromApplicationSettings < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181014121030_enqueue_redact_links.rb b/db/post_migrate/20181014121030_enqueue_redact_links.rb
index 1ee4703c88a..8d1a840d594 100644
--- a/db/post_migrate/20181014121030_enqueue_redact_links.rb
+++ b/db/post_migrate/20181014121030_enqueue_redact_links.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class EnqueueRedactLinks < ActiveRecord::Migration
+class EnqueueRedactLinks < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181022173835_enqueue_populate_cluster_kubernetes_namespace.rb b/db/post_migrate/20181022173835_enqueue_populate_cluster_kubernetes_namespace.rb
index f80a2aa6eac..94a4574abff 100644
--- a/db/post_migrate/20181022173835_enqueue_populate_cluster_kubernetes_namespace.rb
+++ b/db/post_migrate/20181022173835_enqueue_populate_cluster_kubernetes_namespace.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class EnqueuePopulateClusterKubernetesNamespace < ActiveRecord::Migration
+class EnqueuePopulateClusterKubernetesNamespace < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181030135124_fill_empty_finished_at_in_deployments.rb b/db/post_migrate/20181030135124_fill_empty_finished_at_in_deployments.rb
index 32b271c472a..228841a14a0 100644
--- a/db/post_migrate/20181030135124_fill_empty_finished_at_in_deployments.rb
+++ b/db/post_migrate/20181030135124_fill_empty_finished_at_in_deployments.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class FillEmptyFinishedAtInDeployments < ActiveRecord::Migration
+class FillEmptyFinishedAtInDeployments < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181105201455_steal_fill_store_upload.rb b/db/post_migrate/20181105201455_steal_fill_store_upload.rb
index 982001fedbe..a31a4eab472 100644
--- a/db/post_migrate/20181105201455_steal_fill_store_upload.rb
+++ b/db/post_migrate/20181105201455_steal_fill_store_upload.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class StealFillStoreUpload < ActiveRecord::Migration
+class StealFillStoreUpload < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false
diff --git a/db/post_migrate/20181107054254_remove_restricted_todos_again.rb b/db/post_migrate/20181107054254_remove_restricted_todos_again.rb
index 644e0074c46..bbeb4e8a1de 100644
--- a/db/post_migrate/20181107054254_remove_restricted_todos_again.rb
+++ b/db/post_migrate/20181107054254_remove_restricted_todos_again.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # rescheduling of the revised RemoveRestrictedTodosWithCte background migration
-class RemoveRestrictedTodosAgain < ActiveRecord::Migration
+class RemoveRestrictedTodosAgain < ActiveRecord::Migration[4.2]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false