Ojs\SiteBundle\Controller\UserController::createCustomFieldAction PHP Method

    public function createCustomFieldAction(Request $request, $id = null)
    {
        /** @var User $user */
        $user = $this->getUser();
        $em = $this->getDoctrine()->getManager();
        if ($id) {
            /** @var CustomField $customField */
            $customField = $em->find('OjsUserBundle:CustomField', $id);
            if (!$customField) {
                throw new NotFoundException();
            }
            if ($customField->getUserId() != $user->getId()) {
                throw new AccessDeniedException();
            }
        } else {
            $customField = new CustomField();
        }
        $customFieldForm = $this->createForm(new CustomFieldType(), $customField, ['user' => $user->getId()]);
        if ($request->isMethod('POST')) {
            $customFieldForm->handleRequest($request);
            if ($customFieldForm->isValid()) {
                $customField->setUser($user);
                $em->persist($customField);
                $em->flush();
                return $this->redirect($this->get('router')->generate('ojs_user_custom_field'));
            } else {
                $session = $this->get('session');
                $bag = $session->getFlashBag();
                $bag->add('error', $this->get('translator')->trans("An error has occured!"));
                $session->save();
            }
        }
        $data = [];
        $data['form'] = $customFieldForm->createView();
        return $this->render("OjsSiteBundle:User:create_custom_field.html.twig", $data);
    }