public function findOneLastPost($site)
    {
        // select
        $qb = $this->getQueryBuilder()
                ->select('p.id, p.title, p.description, p.slug, p.published, i.path as image_path')
                ->leftJoin('p.images', 'i')

                ->andWhere('p.highlighted=1')
                ->setMaxResults(1)
                ->orderBy('p.published', 'DESC');
        return $qb->getQuery()->getOneOrNullResult(\Doctrine\ORM\Query::HYDRATE_ARRAY);
    }