public function createAction(Request $request)
    {
        $mailingList = new MailingList();

        $form = $this->createForm(MailingListType::class, $mailingList, [
            'action' => $this->generateUrl('opifer_mailing_list_mailing_list_create'),
        ]);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($mailingList);
            $em->flush();

            return $this->redirectToRoute('opifer_mailing_list_mailing_list_index');
        }

        return $this->render('OpiferMailingListBundle:MailingList:create.html.twig', [
            'form' => $form->createView(),
        ]);
    }