public function getParentByClassName($childUid, $classname)
    {
        $q = $this->_em->getConnection()
                ->createQueryBuilder()
                ->select('j.parent_uid, c.classname')
                ->from('content_has_subcontent', 'j')
                ->from('content', 'c')
                ->andWhere('c.uid = j.parent_uid')
                ->andWhere('j.content_uid = :uid')
                ->setParameter('uid', $childUid);

        $result = $q->execute()->fetch();
        if (false !== $result) {
            if ($result['classname'] == $classname) {
                return $this->_em->find($classname, $result['parent_uid']);
            } else {
                $result = $this->getParentByClassName($result['parent_uid'], $classname);
            }
        } else {
            return;
        }

        return $result;
    }