Question

我有一个Post实体，其Cover字段包含一个实体-图片

//src/Entity/Post.php
/**
     * @var Image
     * @ORM\ManyToOne(targetEntity="Image", cascade={"persist"})
     * @ORM\JoinColumn(name="cover_id", referencedColumnName="id")
     **/
    private $cover;

当我使用简单的功能（Symfony自动创建它，然后使用CRUD进行发布）编辑Post时：

//src/Controller/PostController.php
  /**
     * @Route("/{id}/edit", name="post_edit", methods={"GET","POST"})
     */
    public function edit(Request $request, Post $post): Response
    {
        $form = $this->createForm(PostType::class, $post);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $this->getDoctrine()->getManager()->flush();

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

        return $this->render('post/edit.html.twig', [
            'post' => $post,
            'form' => $form->createView(),
        ]);
    }

和形式

    //src/Form/PostType.php
class PostType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('cover', ImageType::class, array(
                'label' => 'Cover'
            ));
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Post::class
        ]);
    }
}

//src/Form/ImagetType.php

class ImageType extends FileType
{
    private $imagePath;
    /**
     * ImageType constructor.
     * @param $imagePath
     */
    public function __construct($imagePath)
    {
        $this->imagePath = $imagePath;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);
        $builder->addModelTransformer(new CallbackTransformer(
            function(Image $image = null) {
                if ($image instanceof Image) {
                    return new File($this->imagePath . '/' . $image->getFile());
                }
            },
            function(UploadedFile $uploadedFile = null) {
                if ($uploadedFile instanceof UploadedFile) {
                    $image = new Image();
                    $image->setFile($uploadedFile);
                    return $image;
                }
            }
        ));
    }

    public function getBlockPrefix()
    {
        return 'image';
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        parent::configureOptions($resolver);
        $resolver->setDefaults([
            'required' => false
        ]);
    }
}

提交编辑表单后，封面字段（即使填充了一个对象）也会显示为空白。

>如何在编辑Post实体的其他字段时使封面上有东西保存？

P.S。我使用此示例下载图像-https://github.com/cirykpopeye/easy-image-uploading-with-symfony-4/tree/master/app

我尝试使用此https://symfony.com/doc/current/doctrine.html#persisting-objects-to-the-database 但这并不能帮助我正确保存

Answer 1

您应该对保存代码进行少量更改。

if ($form->isSubmitted() && $form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($post); // Make persist (prepare you're entity to save in db
            $em->flush(); // Save prepared entity to database
            return $this->redirectToRoute('post_index');
}

一些有用的链接：

如何修复空白字段，然后编辑实体？

1 个答案: