php - 如何将父实体传递给 Symfony 中的表单？

Question

假设我有两个实体:post 和 comment。每个 post 可以有很多 comments。现在，假设我有一个评论表。它应该接受用户输入并将其存储在数据库中。

简单的东西。至少，它应该是，但我无法让它工作。

如何在创建评论(子)时引用帖子(父)？我尝试手动将 post_id 作为隐藏字段传递给评论表单，但收到一个错误，提示帖子 ID 是一个字符串。

Expected argument of type "App\Entity\Post or null", "string" given.

---

到目前为止，这是我的代码。有人可以将我推向正确的方向吗？

CommentType.php

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $post_id = $options['post_id'];

    $builder->add('content', TextareaType::class, [
        'constraints' => [
            new Assert\NotBlank(['message' => 'Your comment cannot be blank.']),
            new Assert\Length([
                'min'        => 10,
                'minMessage' => 'Your comment must be at least {{ limit }} characters long.',
            ]),
        ],
    ])->add('post', HiddenType::class, ['data' => $post_id]);
}

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

---

PostController.php(这是评论表单出现的地方)

// Generate the comment form.
$comment = new Comment();
$form = $this->createForm(CommentType::class, $comment, [
    'action' => $this->generateUrl('new_comment'),
    'post_id'   => $post_id,
]);

---

CommentController.php

/**
 * @param Request $request
 * @Route("/comment/new", name="new_comment")
 * @return
 */
public function new(Request $request, UserInterface $user)
{
    // 1) Build the form
    $comment = new Comment();
    $form = $this->createForm(CommentType::class, $comment);

    // 2) Handle the submit (will only happen on POST)
    $form->handleRequest($request);
    if ($form->isSubmitted() && $form->isValid())
    {
        // 3) Save the comment!
        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($comment);
        $entityManager->flush();
    }

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

---

非常感谢您的帮助!

Answer 1

您只需要传递实际的 Post 实体，而不仅仅是 id。试试这个:

CommentController.php

public function new(Request $request, UserInterface $user, Post $post)
{
    // 1) Build the form
    $comment = new Comment();
    $comment->setPost($post); //where $post is instance of App\Entity\Post
    $form = $this->createForm(CommentType::class, $comment);

    // 2) Handle the submit (will only happen on POST)
    $form->handleRequest($request);
    if ($form->isSubmitted() && $form->isValid())
    {
        // 3) Save the comment!
        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($comment);
        $entityManager->flush();
    }

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

评论类型

public function buildForm(FormBuilderInterface $builder, array $options)
{
    //don't need to set the $post here

    $builder->add('content', TextareaType::class, [
        'constraints' => [
            new Assert\NotBlank(['message' => 'Your comment cannot be blank.']),
            new Assert\Length([
                'min'        => 10,
                'minMessage' => 'Your comment must be at least {{ limit }} characters long.',
            ]),
        ],
    ]);
}

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'data_class' => Comment::class
         //don't need the default here either
     ]);
}

评论实体

class Comment 
{
  /** 
  * @ORM\ManyToOne(targetEntity="App\Entity\Post")
  */
  private $post;

  //other vars

  public function setPost(\App\Entity\Post $post): void
  {
    $this->post = $post;
  }

  public function getPost(): \App\Entity\Post 
  {
     return $this->post;
  }

  //other functions
}