public function getLastPost($pk) { $mapper = new RelationDataMapper('post', Table::POSTS); $mapper->addTable('topic', Table::TOPICS, 'topic.id = post.topic_id')->addTable('category', LunaTable::CATEGORIES, 'category.id = topic.category_id')->addTable('user', WarderTable::USERS, 'user.id = post.user_id'); $post = $mapper->findOne(array('category.id' => $pk), 'post.created DESC'); return $post; }