Symfony Forms和ManyToMany . 如何使用也是EntityType字段的文件上载字段配置表单？

我需要使用文件上传来创建表单字段，该文件也是ManyToMany实体的一部分 . 现在我的配置如下所示，它的工作原理......

class ProductTypeNew extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name')
            ->add('price')
            ->add('description', TextareaType::class)
            ->add('quantity')
            ->add('file', FileType::class, array('label' => 'Zdjęcie'))
        ;

...但我需要在控制器中手动获取表单输入并设置为表单实体

if ($form->isSubmitted() && $form->isValid())
{
    $image = new ShopProductImages();

    $file = $product->getFile();

    $fileName = $this->generateUniqueFileName().'.'.$file->guessExtension();

    $file->move(
        $this->getParameter('shop_images_directory'),
        $fileName
    );

    $image->setFile($fileName);
    $product->addShopProductImages($image);
    $product->setFile($fileName);

    $em = $this->getDoctrine()->getManager();
    $em->persist($image);
    $em->persist($product);
    $em->flush();

我想做这样的事情（但它不起作用）：

->add('shopProductImages', EntityType::class, array(
                'by_reference' => false,
                'entry_type' => FileType::class,
            )

带有Embeded Forms的新版本的表单类型也会导致问题：

关联字段“AppBundle \ Entity \ ShopProducts＃$ shopProductImages”类型“Doctrine \ Common \ Collections \ Collection | array”的预期值，取而代之的是“Symfony \ Component \ HttpFoundation \ File \ UploadedFile” .

...具有以下配置：

ProductTypeNew：

class ProductTypeNew extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', null, array('label' => 'Nazwa'))
            ->add('price', null, array('label' => 'Cena'))
            ->add('description', TextareaType::class, array('label' => 'Opis'))
            ->add('quantity', null, array('label' => 'Ilość'))
            ->add('shopProductImages', ShopProductsImagesType::class);
    }

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => ShopProducts::class,
        ]);
    }

ShopProductsImagesType：

class ShopProductsImagesType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('file', FileType::class, array('label' => 'Zdjęcie'))
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
//            'data_class' => ShopProductImages::class,
            'data_class' => null,
        ]);
    }

实体店铺产品：

/**
 * ShopProducts
 *
 * @ORM\Table(name="shop_products")
 * @ORM\Entity
 */
class ShopProducts
{
   ....

    /**
     * INVERSE SIDE
     *
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(
     *     targetEntity="AppBundle\Entity\ShopProductImages",
     *     mappedBy="shopProducts",
     *     cascade={"persist"}
     * )
     */
    private $shopProductImages;

实体ShopProductImages：

* @ORM\Entity
 */
class ShopProductImages
{
    /**
     * @var string
     *
     * @ORM\Column(name="file", type="text", length=255, nullable=true)
     */
    private $file;