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