public function findNext(Post $post)
 {
     return $this->createQueryBuilder('p')->select('p')->where('p.publishedAt >= :current')->setParameter('current', $post->getPublishedAt())->andWhere('p.online = :online')->setParameter('online', true)->orderBy('p.publishedAt', 'DESC')->setMaxResults(1)->getQuery()->getResult();
 }