public function supprimerGroupeValiderAction(Request $request)
 {
     AuthentificationController::isConnected();
     try {
         $promotion = $request->get('promotion');
         $dao = new PeripheriqueDAO($this->getDoctrine()->getConnection());
         $dao->supprimerGroupe($promotion);
         $dao->exportToJson();
         $title = "Success!";
         $message = "Les peripheriques de la classe " . $promotion . " ont bien ete supprimes!";
     } catch (Exception $e) {
         $title = "Erreur!";
         $message = "Erreur lors de la suppression des peripheriques";
     }
     return $this->render("GlpmrPeripheriqueBundle:Default:supprimer_peripherique.html.twig", array("title" => $title, "message" => $message));
 }