php - 具有文件类型字段editAction的Symfony 3表单集合实体

Question

当存在具有 fileType 字段的实体集合时，如何正确处理表单更新。我根据 Symfony upload docs .实体创建工作完美，但编辑操作失败，因为没有选择文件并且 symfony 尝试用文件字段上的空值更新集合实体。

AppBundle\Entity\Product:
    type: entity
    # ...
    oneToMany:
        images:
            targetEntity: Image
            mappedBy: product

表格:

// AppBundle\Form\ProductType
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        // ...
        ->add(
            'images',
            CollectionType::class,
            [
                'entry_type'    => ImageType::class,
                'allow_add'     => true,
                'allow_delete'  => true,
                'by_reference'  => false,
                'entry_options' => ['label' => false],
                'label_attr'    => [
                    'data-feature' => 'editable',
                ],
            ]
        );
}

// AppBundle\Form\ImageType   
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('file', FileType::class, ['required' => false])
        // another fields...
}

行动:

// AppBundle\Controller\Backend\ProductController
// ...
public function editAction(Request $request, EntityManagerInterface $em, Product $product)
{
    $editForm = $this->createForm('AppBundle\Form\ProductType', $product);
    $editForm->handleRequest($request);

    $originalImages = new ArrayCollection();

    foreach ($product->getImages() as $image) {
        $originalImages->add($image);
    }

    if ($editForm->isSubmitted()) {
        if ($editForm->isValid()) {
            foreach ($originalImages as $image) {
                if (false === $product->getImages()->contains($image)) {
                    $em->remove($image);
                }
            }

            $em->flush();

            $this->addFlash('success', 'Success');
        } else {
            $this->addFlash('warning', 'Error saving');
        }

        return $this->redirectToRoute('backend_product_edit', ['id' => $product->getId()]);
    }
}
// ...

在我看来我需要在某处取消设置空文件字段，但我不知道在哪里...(

附言我知道我可以使用像 VichUploaderBundle 这样的包，但我想了解它是如何工作的，以及我做错了什么!附言对不起我的英语

Answer 1

修改ImageType形式彻底解决了我的问题

// AppBundle\Form\ImageType   
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('file', FileType::class, ['required' => false, 'data_class' => null]])
        // another fields...
    ;
    // adding this forces to use old file if there is no file uploaded
    $builder->get('file')->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
        if (null === $event->getData()) {
            $event->setData($event->getForm()->getData());
        }
    });
}