module RuboCop # Module containing helper methods for writing migration cops. module MigrationHelpers # Tables with permanently small number of records SMALL_TABLES = %i[ application_settings plan_limits ].freeze # Tables with large number of columns (> 50 on GitLab.com as of 03/2020) WIDE_TABLES = %i[ users projects ci_builds ].freeze # List of helpers that add new columns, either directly (ADD_COLUMN_METHODS) # or through a create/alter table (TABLE_METHODS) ADD_COLUMN_METHODS = %i(add_column add_column_with_default change_column_type_concurrently).freeze TABLE_METHODS = %i(create_table create_table_if_not_exists change_table).freeze def high_traffic_tables @high_traffic_tables ||= rubocop_migrations_config.dig('Migration/UpdateLargeTable', 'DeniedTables') end # Returns true if the given node originated from the db/migrate directory. def in_migration?(node) in_deployment_migration?(node) || in_post_deployment_migration?(node) end def in_deployment_migration?(node) dirname(node).end_with?('db/migrate', 'db/geo/migrate') end def in_post_deployment_migration?(node) dirname(node).end_with?('db/post_migrate', 'db/geo/post_migrate') end def version(node) File.basename(node.location.expression.source_buffer.name).split('_').first.to_i end # Returns true if a column definition is for an array # rubocop:disable Lint/BooleanSymbol def array_column?(node) node.each_descendant(:pair).any? do |pair_node| pair_node.child_nodes[0].value == :array && # Searching for a (pair (sym :array) (true)) node pair_node.child_nodes[1].type == :true # RuboCop::AST::Node uses symbols for types, even when that is a :true end end # rubocop:enable Lint/BooleanSymbol private def dirname(node) File.dirname(node.location.expression.source_buffer.name) end def rubocop_migrations_config @rubocop_migrations_config ||= YAML.load_file(File.join(rubocop_path, 'rubocop-migrations.yml')) end def rubocop_path File.expand_path(__dir__) end end end