Wybrane pola mapowane na obiekt w doctrine

public function findPosts() {
        $posts = $this->getEntityManager()->createQueryBuilder('p');
        $posts
                ->select('partial p.{id, title, slug,shortcontent,publishedAt}', 't')
                ->from('App:Post', 'p')
                ->leftJoin('p.tags', 't')
                ->orderBy('p.id', 'DESC');

        return $posts;
    }