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# frozen_string_literal: true
class EnsureTargetProjectIdIsFilled < ActiveRecord::Migration[6.0]
include Gitlab::Database::MigrationHelpers
BACKGROUND_MIGRATION_CLASS = 'CopyMergeRequestTargetProjectToMergeRequestMetrics'
BATCH_SIZE = 1_000
DOWNTIME = false
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
end
class MergeRequestMetrics < ActiveRecord::Base
include EachBatch
belongs_to :merge_request
self.table_name = 'merge_request_metrics'
end
def up
Gitlab::BackgroundMigration.steal(BACKGROUND_MIGRATION_CLASS)
# Do a manual update in case we lost BG jobs. The expected record count should be 0 or very low.
MergeRequestMetrics.where(target_project_id: nil).each_batch do |scope|
query_for_cte = scope.joins(:merge_request).select(
MergeRequestMetrics.arel_table[:id].as('id'),
MergeRequest.arel_table[:target_project_id].as('target_project_id')
)
MergeRequestMetrics.connection.execute <<-SQL
WITH target_project_id_and_metrics_id as #{Gitlab::Database::AsWithMaterialized.materialized_if_supported} (
#{query_for_cte.to_sql}
)
UPDATE #{MergeRequestMetrics.connection.quote_table_name(MergeRequestMetrics.table_name)}
SET target_project_id = target_project_id_and_metrics_id.target_project_id
FROM target_project_id_and_metrics_id
WHERE merge_request_metrics.id = target_project_id_and_metrics_id.id
SQL
end
end
def down
# no-op
end
end
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