Class: Gitlab::BackgroundMigration::CleanSubscriptionsUserIdColumn

Inherits:
BatchedMigrationJob show all
Defined in:
lib/gitlab/background_migration/clean_subscriptions_user_id_column.rb

Constant Summary

Constants inherited from BatchedMigrationJob

BatchedMigrationJob::DEFAULT_FEATURE_CATEGORY, BatchedMigrationJob::MINIMUM_PAUSE_MS

Constants included from Database::DynamicModelHelpers

Database::DynamicModelHelpers::BATCH_SIZE

Instance Method Summary collapse

Methods inherited from BatchedMigrationJob

#batch_metrics, cursor, cursor?, cursor_columns, feature_category, #filter_batch, generic_instance, health_context_tables, #initialize, job_arguments, job_arguments_count, operation_name, scope_to, tables_to_check_for_vacuum

Methods included from Database::DynamicModelHelpers

define_batchable_model, #each_batch, #each_batch_range

Constructor Details

This class inherits a constructor from Gitlab::BackgroundMigration::BatchedMigrationJob

Instance Method Details

#perform ⇒ Object 



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# File 'lib/gitlab/background_migration/clean_subscriptions_user_id_column.rb', line 9

def perform
  each_sub_batch do |sub_batch|
    connection.execute(
      <<~SQL
        WITH relation AS MATERIALIZED (
          #{sub_batch.limit(sub_batch_size).to_sql}
        ), filtered_relation AS MATERIALIZED (
          SELECT "id" from relation WHERE
            NOT EXISTS (SELECT 1 FROM "users" WHERE "users"."id" = relation."user_id")
            LIMIT #{sub_batch_size}
        )
        DELETE FROM "subscriptions" WHERE "id" IN (SELECT "id" FROM filtered_relation)
      SQL
    )
  end
end