public function getPointsByAttempt(Attempt $attempt)
 {
     $points = $this->getEntityManager()->createQuery("SELECT SUM(answer.points) FROM AppBundle:UserAnswer u\n                INNER JOIN u.answer answer\n                WHERE u.attempt=" . $attempt->getId())->getSingleScalarResult();
     if ($points != null) {
         return $points;
     } else {
         return 0;
     }
 }