/**
  * @Route("/categorie/{id}/question/ajouter", name="question_add")
  */
 public function addAction(Request $request, Category $category)
 {
     $question = new Question();
     $category->addQuestion($question);
     $form = $this->createForm(new QuestionType(), $question);
     $form->handleRequest($request);
     if ($form->isValid() && $form->isSubmitted()) {
         $em = $this->getDoctrine()->getEntityManager();
         $em->persist($question);
         $em->flush();
         return $this->redirect($this->generateUrl('category_show', ['id' => $category->getId()]));
     }
     return $this->render(':question:add.html.twig', ['form' => $form->createView()]);
 }