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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Kunstmaan\FormBundle\Helper;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use ArrayObject;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\ORM\EntityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\FormBundle\Entity\FormAdaptorInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\FormBundle\Entity\FormSubmission;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\FormBundle\Entity\FormSubmissionField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\FormBundle\Event\FormEvents;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\FormBundle\Event\SubmissionEvent;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Kunstmaan\NodeBundle\Helper\RenderContext;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\DependencyInjection\ContainerInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Form\Extension\Core\Type\FormType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Form\FormBuilderInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpFoundation\RedirectResponse;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpFoundation\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Routing\RouterInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * The form handler handles everything from creating the form to handling the submitted form  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class FormHandler implements FormHandlerInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ContainerInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $container;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ContainerInterface $container  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(ContainerInterface $container)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->container = $container;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param FormPageInterface $page    The form page  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Request           $request The request  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param RenderContext     $context The render context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return RedirectResponse|void|null  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function handleForm(FormPageInterface $page, Request $request, RenderContext $context)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var EntityManager $em */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $em = $this->container->get('doctrine.orm.entity_manager'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var FormBuilderInterface $formBuilder */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $formBuilder = $this->container->get('form.factory')->createBuilder(FormType::class); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var RouterInterface $router */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $router = $this->container->get('router'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var ArrayObject $fields */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields = new ArrayObject();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $pageParts = $em->getRepository('KunstmaanPagePartBundle:PagePartRef')->getPageParts($page, $page->getFormElementsContext()); | 
            
                            
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                        foreach ($pageParts as $sequence => $pagePart) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($pagePart instanceof FormAdaptorInterface) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $pagePart->adaptForm($formBuilder, $fields, $sequence);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $form = $formBuilder->getForm();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($request->getMethod() == 'POST') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $form->handleRequest($request);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($form->isSubmitted() && $form->isValid()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $formSubmission = new FormSubmission();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $formSubmission->setIpAddress($request->getClientIp());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $formSubmission->setNode($em->getRepository('KunstmaanNodeBundle:Node')->getNodeFor($page)); | 
            
                            
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                                $formSubmission->setLang($request->getLocale());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $em->persist($formSubmission);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                /* @var FormSubmissionField $field */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                foreach ($fields as $field) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $field->setSubmission($formSubmission);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $field->onValidPost($form, $formBuilder, $request, $this->container);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $em->persist($field);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $em->flush();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $em->refresh($formSubmission);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $event = new SubmissionEvent($formSubmission, $page);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->dispatch($event, FormEvents::ADD_SUBMISSION);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return new RedirectResponse($page->generateThankYouUrl($router, $context));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $context['frontendform'] = $form->createView();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $context['frontendformobject'] = $form;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param object $event  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $eventName  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return object  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                                                    
                                                                                                        
            
            
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                    private function dispatch($event, string $eventName)  | 
            
                            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        $eventDispatcher = $this->container->get('event_dispatcher'); | 
            
            
                                                        
            
                                    
            
            
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                        if (class_exists(LegacyEventDispatcherProxy::class)) { | 
            
            
                                                        
            
                                    
            
            
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                            $eventDispatcher = LegacyEventDispatcherProxy::decorate($eventDispatcher);  | 
            
            
                                                        
            
                                    
            
            
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                            return $eventDispatcher->dispatch($event, $eventName);  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        return $eventDispatcher->dispatch($eventName, $event);  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: