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(
      "        WITH relation AS MATERIALIZED (\n          \#{sub_batch.limit(sub_batch_size).to_sql}\n        ), filtered_relation AS MATERIALIZED (\n          SELECT \"id\" from relation WHERE\n            NOT EXISTS (SELECT 1 FROM \"users\" WHERE \"users\".\"id\" = relation.\"user_id\")\n            LIMIT \#{sub_batch_size}\n        )\n        DELETE FROM \"subscriptions\" WHERE \"id\" IN (SELECT \"id\" FROM filtered_relation)\n      SQL\n    )\n  end\nend\n"