public function submitAction(Request $request)
 {
     $article = new Article();
     $articleExtend = new ArticleExtend();
     $article->setArticleExtend($articleExtend);
     $form = $this->createForm(ArticleType::class, $article);
     $form->handleRequest($request);
     if ($form->isValid()) {
         $em = $this->getDoctrine()->getManager();
         $article->setDate(new \DateTime());
         $articleExtend->setArticle($article);
         $em->persist($article);
         $em->persist($articleExtend);
         $em->flush();
         return $this->redirect($this->generateUrl('backoffice_article'));
     }
     return ['entity' => $article, 'form' => $form->createView()];
 }