private function saveComment($request)
{
$comment = new Comment();
$user = $this->userSession->getUser();
$user = $this->em->find("App\Model\User", $user->getId());
$comment->setUser($user);
$comment->setComment($request->get('comment'));
$post = $this->em->find("App\Model\Post", $request->get('postId'));
$post->setCommentsNum($post->getCommentsNum()+1);
$comment->setPost($post);
$comment->setPostedAt(new \DateTime('now'));
$this->em->persist($comment);
$this->em->flush();
return $comment;
}