change_column( $this->get_table_name(), 'post_status', 'string', [ 'null' => true, 'limit' => 20 ] ); $this->add_index( $this->get_table_name(), [ 'post_parent', 'object_type', 'post_status', 'object_id' ], [ 'name' => 'subpages' ] ); } /** * Migration down. * * @return void */ public function down() { $this->change_column( $this->get_table_name(), 'post_status', 'string', [