如何将父实体传递给Symfony中的表单？

Question

假设我有两个实体:a post和a comment.每个都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,但我不能让它工作.

创建评论(孩子)时如何引用帖子(父母)？我尝试手动将post_id注释表单作为隐藏字段传递,但收到错误抱怨帖子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.有人能把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(这是评论表格出现的地方)

// 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

这段代码对我有用：

CommentController.php

正如上面 flint 所建议的，您只需要传递实际的 Post 实体，而不仅仅是 id。然后，如果出现此错误，"Unable to guess how to get a Doctrine instance from the request information for parameter "post"这是因为您需要在new_comment路由的路径中添加post slug 。ParamConverter 是隐式调用的，它需要这个 slug {post} ，其名称与您在函数中用于post参数的名称相同。

/**
 * @param Request $request
 * @return \Symfony\Component\HttpFoundation\RedirectResponse
 * @Route("/comment/new/{post}", name="new_comment")
 */
public function new(Request $request, Post $post)
{
    $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');
}

PostController.php

/**
 * @Route("/post/{id}", name="get_post")
 */
public function getPostAction(Post $post)

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

    return $this->render('listeArticles.html.twig', [
        'form' => $form->createView()
    ]);

 }

评论类型.php

class CommentType extends AbstractType
{
    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.',
                ]),
            ],
        ])
        ->add('submit', SubmitType::class);
    }

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

这样您就不需要删除两个表之间的 Doctrine 关系并手动设置 ID。