gistfile1.txt

      if($request->isXmlHttpRequest()) {

        if (isset($date)) {
          $date = date_create_from_format('y-m-d', $date);
          //remove the training session row from the db for this user
          $user = $this->get('security.context')->getToken()->getUser();
          $em = $this->getDoctrine()->getEntityManager();
          $query = $em->createQuery('SELECT ts from GymloopDiaryBundle:TrainingSession ts
                                    WHERE ts.user = :user AND CAST(ts.date as DATE) = :date')
                                    ->setParameter('user', $user)
                                    ->setParameter('date', $date);
          $trainingSession = $query->getSingleResult();

          if ($trainingSession) {
            $em->remove($trainingSession);
            $em->flush();
            return new Response('success');
          }

        }
      }