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# This is identical to the stolen background migration, which already has specs.
class PopulateMergeRequestsLatestMergeRequestDiffIdTakeTwo < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 1_000
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
include ::EachBatch
end
disable_ddl_transaction!
def up
Gitlab::BackgroundMigration.steal('PopulateMergeRequestsLatestMergeRequestDiffId')
update = '
latest_merge_request_diff_id = (
SELECT MAX(id)
FROM merge_request_diffs
WHERE merge_requests.id = merge_request_diffs.merge_request_id
)'.squish
MergeRequest.where(latest_merge_request_diff_id: nil).each_batch(of: BATCH_SIZE) do |relation|
relation.update_all(update)
end
end
end
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