40 lines
1.1 KiB
Ruby
40 lines
1.1 KiB
Ruby
# frozen_string_literal: true
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class AddUniqueConstraintToApprovalsUserIdAndMergeRequestId < ActiveRecord::Migration[5.0]
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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disable_ddl_transaction!
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def up
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remove_duplicates
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add_concurrent_index :approvals, [:user_id, :merge_request_id], unique: true
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end
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def down
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remove_concurrent_index :approvals, [:user_id, :merge_request_id]
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end
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private
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def remove_duplicates
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add_concurrent_index :approvals, [:user_id, :merge_request_id, :id]
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execute <<-SQL
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DELETE FROM approvals
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USING (
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SELECT user_id, merge_request_id, MIN(id) as min_id
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FROM approvals
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GROUP BY user_id, merge_request_id
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HAVING COUNT(id) > 1
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) as approvals_with_duplicates
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WHERE approvals_with_duplicates.user_id = approvals.user_id
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AND approvals_with_duplicates.merge_request_id = approvals.merge_request_id
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AND approvals_with_duplicates.min_id <> approvals.id;
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SQL
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remove_concurrent_index :approvals, [:user_id, :merge_request_id, :id]
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end
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end
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