public function deleteAction(Category $category, Request $request)
 {
     $em = $this->getDoctrine()->getManager();
     $title = $category->getTitre();
     $em->remove($category);
     $em->flush();
     $session = $request->getSession();
     $session->getFlashBag()->add('info', $title . ' supprimé');
     return $this->redirectToRoute('troiswa_back_categorie');
 }