code: public function formAction(Request $request)
      {
          $useAjax = $request->get('use_ajax', true);
  
          $inquiry = new ContactInquiry();
  
          $form = $this->createForm(ContactFormType::class, $inquiry, array(
              'action' => $this->generateUrl('C33s_ContactFormBundle_form'),
              'method' => 'POST',
              'attr' => array(
                  'id' => 'c33s_contact_form',
              ),
          ));
  
          $message = $request->get('success_message', false);
          $form->handleRequest($request);
  
          if ($form->isValid()) {
              if ($this->container->getParameter('c33s_contact_form.database.enabled') === true) {
                  $inquiry->save();
              }
              if ($this->container->getParameter('c33s_contact_form.email.enabled') === true) {
                  $this->sendEmails($inquiry);
              }
  
              return array('form' => null, 'use_ajax' => $useAjax, 'success_message' => null, 'success' => true);
          }
  
          return array('form' => $form->createView(), 'use_ajax' => $useAjax, 'success_message' => $message, 'success' => false);
      }
docs: @Route("/contact_form/show", name="C33s_ContactFormBundle_form")
  @Template()
  
  @return \Symfony\Component\HttpFoundation\Response