public function last() {
		$query     = $this->build_query();
		$return_id = 'ids' === $query->get( 'fields', '' );
		$query->set( 'fields', 'ids' );
		$ids = $query->get_posts();

		if ( empty( $ids ) ) {
			return null;
		}

		return $return_id ? end( $ids ) : $this->format_item( end( $ids ) );
	}