/**
  * Ajax function to confirm a user as the croissants bringer.
  * 
  * Function used only by Admin
  * 
  * @return \Symfony\Component\HttpFoundation\Response
  */
 public function confirmUserAction()
 {
     $request = $this->getRequest();
     if ($request->isXmlHttpRequest()) {
         $response = new Response();
         try {
             $dayOfConfirmation = DateTime::createFromFormat("dmY", $request->request->get('date'));
             $dayOfConfirmation->setTime(0, 0);
             $username = $request->request->get('username');
             $em = $this->getDoctrine()->getManager();
             $repositoryFS = $em->getRepository('STXCroissantsBundle:Friday_Subscriptions');
             $friday_subscribtion = $repositoryFS->findOneBy(array('date' => $dayOfConfirmation));
             if (is_null($friday_subscribtion)) {
                 $friday_subscribtion = new Friday_Subscriptions();
                 $friday_subscribtion->setDate($dayOfConfirmation);
             }
             $userManager = $this->get('fos_user.user_manager');
             $confirmationUser = new User();
             $confirmationUser = $userManager->findUserBy(array('username' => $username));
             $friday_subscribtion->setConfirmationUser($confirmationUser);
             $em->persist($friday_subscribtion);
             $em->flush();
             //$this->get('session')->getFlashBag()->add('success', 'Utilisateur ' . $username . 'a apporté les croissants le ' . $dayOfConfirmation .'!');
             $output = array('success' => TRUE, 'message' => 'Confirmation complete!', 'user' => $confirmationUser->getUsername());
         } catch (\Exception $e) {
             //$this->get('session')->getFlashBag()->add('error', 'Erreur survenue!');
             $output = array('success' => FALSE, 'message' => 'An undefined exception occurred!');
         }
         $response->headers->set('Content-Type', 'application/json');
         $response->setContent(json_encode($output));
         return $response;
     }
 }