36 lines
1.1 KiB
Ruby
36 lines
1.1 KiB
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
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# for more information on how to write migrations for GitLab.
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class MergeRequestDiffRemoveUniq < ActiveRecord::Migration
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include Gitlab::Database::MigrationHelpers
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disable_ddl_transaction!
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DOWNTIME = false
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def up
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constraint_name = 'merge_request_diffs_merge_request_id_key'
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transaction do
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if index_exists?(:merge_request_diffs, :merge_request_id)
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remove_index(:merge_request_diffs, :merge_request_id)
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end
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# In some bizarre cases PostgreSQL might have a separate unique constraint
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# that we'll need to drop.
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if constraint_exists?(constraint_name) && Gitlab::Database.postgresql?
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execute("ALTER TABLE merge_request_diffs DROP CONSTRAINT IF EXISTS #{constraint_name};")
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end
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end
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end
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def down
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unless index_exists?(:merge_request_diffs, :merge_request_id)
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add_concurrent_index(:merge_request_diffs, :merge_request_id, unique: true)
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end
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end
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def constraint_exists?(name)
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indexes(:merge_request_diffs).map(&:name).include?(name)
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end
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end
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