Question

我有一家公司，其中有一个徽标字段。我在编辑页面中的想法是，如果在编辑表单中，该字段为空，则保留我们以前在数据库上拥有的徽标，因为这是必填字段。

我的想法是获取以前要提交的表单数据，并检查该字段是否为空以从数据库中获取数据以对其进行更新。我使用了eventListener，但是在提交数据时，获取null不会改变。对于这个symfony版本，我几乎是新手，但我无法做到这一点。你可以帮帮我吗。谢谢

/**
    * @Route("/admin/companies/edit/{id}", name="edit_company")
    * Method({"GET", "POST"})
    */
    public function editCompany(Request $request, $id){

        $company = new Company();
        $company = $this->getDoctrine()->getRepository(Company::class)->find($id);      

        $form = $this->createFormBuilder($company)
            ->add('name', TextType::class, array('attr' => array('class' => 'form-control')))
            ->add('description', TextAreaType::class, array('attr' => array('class' => 'form-control summernote')))
            ->add('telephone', TextType::class, array('attr' => array('class' => 'form-control')))
            ->add('city', TextType::class, array('attr' => array('class' => 'form-control')))
            ->add('web', UrlType::class, array('attr' => array('class' => 'form-control')))
            ->add('image', FileType::class, array('data_class' => null, 'label' => false, 'required' => false, 'attr' => array('class' => 'form-control d-none')))            
            ->add('save', SubmitType::class, ['label' => 'Edit Company', 'attr' => array('class' => 'btn btn-success p-2 mt-5')])`enter code here`
            ->addEventListener(FormEvents::PRE_SUBMIT, function(FormEvent $event) {
                $data = $event->getData();
                $form = $event->getForm();
                $image = $data['image'];
                if ($image == null){
                    $company_tmp = $this->getDoctrine()->getRepository(Company::class)->find($form->getData()->getId());
                    $data['image'] = $company_tmp->getImage();           
                    $event->setData($data);
                }               

            })          
            ->getForm();

        $form->handleRequest($request);


        if ( ($form->isSubmitted()) && ( $form->isValid() ) ){          

            $company = $form->getData();

            $file = $form->get('image')->getData();

            if ($file !== null){
                $fileName = 'company-'.$this->generateUniqueFileName().'.'.$file->guessExtension();                         
                // Move the file to the directory where brochures are stored
                try {
                    $moved = $file->move( $this->get('kernel')->getProjectDir() . '/public/uploads', $fileName );
                } catch (FileException $e) {
                   throw new HttpNotFoundException("Page not found");
                }
                $company->setImage($fileName);
            }

            $entityManager= $this->getDoctrine()->getManager();     
            $entityManager->flush();
            $flashbag = $this->get('session')->getFlashBag();           
            $flashbag->add("success", "Company Edited Correctly");  

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

        return $this->render('admin/edit_company.html.twig', 
            array(
                'form' => $form->createView(),
                'company' => $company,
            )
        );
    }

例如，如果先前要保存的图像名称为company122121.jpg，而数据的编辑表单为空，则将company122121.jpg保留在数据库中。但是结果始终为空。我已经在侦听器上检查了$ event-> getData（），数据是正确的，但是当我在isSubmitted（）之后获取数据时，该数据为空。

Result with dump listener and image after submit

Answer 1

根据官方文档： https://symfony.com/doc/current/controller/upload_file.html

创建表单以编辑已保留的项目时，文件表单类型仍然需要File实例。现在作为永久实体仅包含相对文件路径，您首先必须串联配置的上传路径和存储的文件名并创建一个新的文件类别：

std::vector<int> my_vector {1,3,3,7};

for(auto [i, my_element] : en::enumerate(my_vector))
{
    // do stuff
}

所以我认为您应该添加

use Symfony\Component\HttpFoundation\File\File;
// ...

$product->setBrochure(
    new File($this->getParameter('brochures_directory').'/'.$product->getBrochure())
);

之后

$company->setImage(new File($pathToYourImage));

Answer 2

我还建议通过“事件事件订阅者”中包含的服务来处理图像上传。

我还将图像作为媒体对象保存到数据库，其中包含上载图像的文件名，可以通过postLoad侦听器正确解析。

参考： Doctrine Event Subscriber File Upload Service

class UploadHandler
{
    /** @var string */
    private $fileDirectory;

    /**
     * FileUploader constructor.
     *
     * @param string $fileDirectory
     */
    public function __construct(
        string $fileDirectory
    ) {
        $this->fileDirectory = $fileDirectory;
    }

    /**
     * Move the file to the upload directory.
     *
     * @param UploadedFile $file
     *
     * @return string
     */
    public function upload(UploadedFile $file) {
        $fileName = md5(uniqid() . '.' . $file->guessExtension());

        $file->move($this->getFileDirectory(), $fileName);

        return $fileName;
    }

    /**
     * @return string
     */
    public function getFileDirectory(): string {
        return $this->fileDirectory;
    }
}

class UploadEventSubscriber
{
    /**
     * @var FileUploader
     */
    private $uploader;

    /**
     * UploadEventSubscriber constructor.
     * @param FileUploader $uploader
     */
    public function __construct(
        FileUploader $uploader
    )
    {
        $this->uploader = $uploader;
    }

    /**
     * Returns an array of events this subscriber wants to listen to.
     *
     * @return string[]
     */
    public function getSubscribedEvents()
    {
        return [
            'prePersist',
            'preUpdate',
            'postLoad'
        ];
    }

    /**
     * Pre-Persist method for Media.
     *
     * @param LifecycleEventArgs $args
     */
    public function prePersist(LifecycleEventArgs $args) {
        /** @var Media $entity */
        $entity = $args->getEntity();

        if (!$this->validInstance($entity)) {
            return;
        }

        $this->uploadFile($entity);
    }

    /**
     * Pre-Update method for Media.
     *
     * @param LifecycleEventArgs $args
     */
    public function preUpdate(LifecycleEventArgs $args) {
        /** @var Media $entity */
        $entity = $args->getEntity();

        if (!$this->validInstance($entity)) {
            return;
        }

        $this->uploadFile($entity);
    }

    /**
     * Post-Load method for Media
     *
     * @param LifecycleEventArgs $args
     */
    public function postLoad(LifecycleEventArgs $args) {
        /** @var Media $entity */
        $entity = $args->getEntity();

        if (!$this->validInstance($entity)) {
            return;
        }

        $fileName = $entity->getImage();
        if($fileName) {
            $entity->setImage(new File($this->uploader->getFileDirectory() . '/' . $fileName));
        }
    }

    /**
     * Check if a valid entity is given.
     *
     * @param object $entity
     * @return bool
     */
    private function validInstance($entity)
    {
        return $entity instanceof Media;
    }

    /**
     * Upload the file
     * @param Media $entity
     */
    private function uploadFile(Media $entity)
    {
        $file = $entity->getImage();

        if($file instanceof UploadedFile) {
            $fileName = $this->uploader->upload($file);
            $entity->setImage($fileName);
        }
    }
}

Pre_submit问题在Symfony3上保存数据

2 个答案: