/**
  * (non-PHPDoc)
  * @see \Rhapsody\SocialBundle\Repository\TopicRepositoryInterface::findOneById()
  */
 public function findOneByForumAndId(ForumInterface $forum, $id)
 {
     $qb = $this->createQueryBuilder()->field('_id')->equals(new \MongoId($id))->field('socialContext.$id')->equals(new \MongoId($forum->getId()));
     $query = $qb->getQuery();
     return $query->getSingleResult();
 }
 /**
  * Returns the uniform resource location (URL) of the topic.
  *
  * @param ForumInterface $forum the forum.
  * @param TopicInterface $topic the topic.
  * @return the uniform resource location (URL) of the topic.
  */
 protected function getTopicUrl(ForumInterface $forum, TopicInterface $topic)
 {
     $route = 'rhapsody_forum_topic_view';
     $url = $this->router->generate($route, array('forum' => $forum->getId(), 'topic' => $topic->getId()), UrlGeneratorInterface::ABSOLUTE_URL);
     return $url;
 }