public function doesPublicIdExist($id, VisitorSession $visitorSession)
 {
     if ($visitorSession->getId()) {
         $tvs = $this->getEntityManager()->createQuery(' SELECT vsrtv FROM QuestionKeyBundle:VisitorSessionRanTreeVersion vsrtv' . ' WHERE vsrtv.visitorSession = :vs AND vsrtv.publicId = :public_id')->setParameter('vs', $visitorSession)->setParameter('public_id', $id)->getResult();
         return (bool) $tvs;
     } else {
         return false;
     }
 }