/**
  *
  * @access protected
  * @param \CCDNForum\ForumBundle\Entity\Topic $topic
  */
 protected function updateTopicStats(Topic $topic)
 {
     if ($topic->getId()) {
         // Get stats.
         $topicPostCount = $this->postModel->countPostsForTopicById($topic->getId());
         $topicFirstPost = $this->postModel->getFirstPostForTopicById($topic->getId());
         $topicLastPost = $this->postModel->getLastPostForTopicById($topic->getId());
         // Set the board / topic last post.
         $topic->setCachedReplyCount($topicPostCount > 0 ? --$topicPostCount : 0);
         $topic->setFirstPost($topicFirstPost ?: null);
         $topic->setLastPost($topicLastPost ?: null);
         $this->topicModel->updateTopic($topic);
     }
 }