gitlab-org--gitlab-foss/db/migrate/20170828135939_migrate_user_external_mail_data.rb

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# 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[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class User < ActiveRecord::Base
self.table_name = 'users'
include EachBatch
end
class UserSyncedAttributesMetadata < ActiveRecord::Base
self.table_name = 'user_synced_attributes_metadata'
include EachBatch
end
def up
User.each_batch do |batch|
start_id, end_id = batch.pluck('MIN(id), MAX(id)').first
execute <<-EOF
INSERT INTO user_synced_attributes_metadata (user_id, provider, email_synced)
SELECT id, email_provider, external_email
FROM users
WHERE external_email = TRUE
AND NOT EXISTS (
SELECT true
FROM user_synced_attributes_metadata
WHERE user_id = users.id
AND (provider = users.email_provider OR (provider IS NULL AND users.email_provider IS NULL))
)
AND id BETWEEN #{start_id} AND #{end_id}
EOF
end
end
def down
UserSyncedAttributesMetadata.each_batch do |batch|
start_id, end_id = batch.pluck('MIN(id), MAX(id)').first
execute <<-EOF
UPDATE users
SET users.email_provider = metadata.provider, users.external_email = metadata.email_synced
FROM user_synced_attributes_metadata as metadata, users
WHERE metadata.email_synced = TRUE
AND metadata.user_id = users.id
AND id BETWEEN #{start_id} AND #{end_id}
EOF
end
end
end