public function doesCodeExist($code, TreeVersion $treeVersion)
 {
     if ($treeVersion->getId()) {
         $tvs = $this->getEntityManager()->createQuery(' SELECT tvpc FROM QuestionKeyBundle:TreeVersionPreviewCode tvpc' . ' WHERE tvpc.treeVersion = :treeVersion AND tvpc.code = :code')->setParameter('treeVersion', $treeVersion)->setParameter('code', $code)->getResult();
         return (bool) $tvs;
     } else {
         return false;
     }
 }
 public function doesPublicIdExist($id, TreeVersion $treeVersion)
 {
     if ($treeVersion->getId()) {
         $s = $this->getEntityManager()->createQuery(' SELECT lc FROM QuestionKeyBundle:LibraryContent lc' . ' WHERE lc.treeVersion = :treeVersion AND lc.publicId = :public_id')->setParameter('treeVersion', $treeVersion)->setParameter('public_id', $id)->getResult();
         return (bool) $s;
     } else {
         return false;
     }
 }