public function findComment($commentOrId)
    {
        if ($commentOrId instanceof CommentInterface) {
            $commentOrId = $commentOrId->getId();
        }
        
        $application = $this->findOneBy(array('comments.id' => $commentOrId));
        /* @var \Applications\Entity\Comment $comment */
        foreach ($application->getComments() as $comment) {
            if ($comment->getId() == $commentOrId) {
                return $comment;
            }
        }
        return null;
    }