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