public function addAudioToPlaylistAction(Request $request)
 {
     if ($request->isXmlHttpRequest()) {
         $data = $request->request;
         $audios = $data->get('audios');
         $playlist_title = $request->request->get('playlist');
         $em = $this->container->get('doctrine')->getEntityManager();
         $audio_repo = $repo = $em->getRepository('LCVPlaylistBundle:AudioFile');
         $playlist_audio_repo = $repo = $em->getRepository('LCVPlaylistBundle:PlaylistAudio');
         $playlist_repo = $em->getRepository('LCVPlaylistBundle:Playlist');
         $playlist = $playlist_repo->findOneByTitle($playlist_title);
         $success = array();
         $errors = array();
         foreach ($audios as $title => $audio) {
             if ($playlist_repo->titleAvailable($playlist->getId(), $title)) {
                 $audioFile = $audio_repo->findOneById($audio);
                 $playlist_audio = new PlaylistAudio();
                 $playlist_audio->setAudio($audioFile);
                 $playlist_audio->setPlaylist($playlist);
                 $playlist_audio->setSortOrder(0);
                 $playlist_audio->setTitle($title);
                 $em->persist($playlist_audio);
                 $data->add(array("success" => $success));
             } else {
                 $errors[] = $title . " existe déjà dans la playlist et n'a pas été ajouté.";
             }
         }
         $em->flush();
         $success[] = "L'ajout des morceaux dans " . $playlist_title . " à bien été pris en compte.";
         $data->add(array("success" => $success));
         $data->add(array("errors" => $errors));
         $data = $this->container->get('serializer')->serialize($data, 'json');
         return new JsonResponse(array('data' => $data));
     } else {
         return $this->indexAction($request);
     }
 }