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