31 lines
839 B
Ruby
31 lines
839 B
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 AddForeignKeyForMergeRequestDiffs < ActiveRecord::Migration[4.2]
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include Gitlab::Database::MigrationHelpers
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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disable_ddl_transaction!
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def up
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execute <<-EOF
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DELETE FROM merge_request_diffs
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WHERE NOT EXISTS (
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SELECT true
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FROM merge_requests
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WHERE merge_requests.id = merge_request_diffs.merge_request_id
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)
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EOF
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add_concurrent_foreign_key(:merge_request_diffs,
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:merge_requests,
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column: :merge_request_id)
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end
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def down
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remove_foreign_key(:merge_request_diffs, column: :merge_request_id)
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end
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end
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