400坏请求Symfony 3带角

Question

我在想我做错了什么。我收到了400个错误的请求，试图通过角服务发送一个帖子请求。我有两个实体--Document和DocumentCategory（多对多关系）。我可以张贴文件本身（没有类别）没有问题。

createDocument(title, body, categories) {
    let document = {title: title, body: body, categories: categories};
    this._crudService.createDocument(document).subscribe(
        data => {
            return true;
        },
        error => {
            console.error("Error saving document! " + error);
            return Observable.throw(error);
        }
    );
} 

createDocument(document) {
    let headers = new Headers({'Content-Type': 'application/json'});
    let options = new RequestOptions({headers: headers});
    //let body = JSON.stringify(document);
    let body = document;
    return this.http.post
        ('http://localhost:8000/documents', body, headers);
}

public function buildForm(FormBuilderInterface $builder, array $options) {
    $builder
            ->add('title', TextType::class)
            ->add('body', TextType::class)
            //->add('categories', TextType::class)
            ->add('categories', EntityType::class, array(
                'class' => 'AppBundle:DocumentCategory',
                'multiple' => true,
                'expanded' => true,
                'by_reference' => false,
                'choice_label' => 'id',
            ))
    ;
}

/**
 * @ORM\ManyToMany(targetEntity="DocumentCategory", mappedBy="documents") 
 * @JMSSerializer\Expose
 */
private $categories;

/**
 * @ORM\ManyToMany(targetEntity="Document", inversedBy="categories")
 * @ORM\JoinTable(name="document_category_document")
 * @JMSSerializer\Expose
 */
private $documents;

{
  "title": "t",
  "body": "<p>b</p>",
  "categories": [
    {
      "id": 1,
      "name": "cat1",
      "documents": []
    },
    {
      "id": 2,
      "name": "cat2",
      "documents": []
    }
  ]
}

正如我所说，如果我删除类别，一切都可以工作。我想不通：（

编辑：当我试图将上面的json作为application/json发送时，Postman显示了这一点作为响应：

{
  "children": {
    "title": {},
    "body": {},
    "categories": {
      "errors": [
        "This value is not valid."
      ],
      "children": {
        "1": {},
        "2": {},
        "3": {},
        "4": {}
      }
    }
  }
}

Answer 1

过了一段时间，我终于成功了。这是我的结果，以防有人有simmilar问题。这不是最优雅的解决方案，我会试图找到一个更好的，但至少它是有效的。问题出在控制器上。现在post方法如下所示：

public function postAction(Request $request) { 
    $form = $this->createForm(DocumentType::class, null, [
        'csrf_protection' => false,
    ]);
    $form->submit($request->request->all());
    if (!$form->isValid()) {
        return $form;
    }

    $em = $this->getDoctrine()->getManager();
    $document = $form->getData();
    $categories = $request->request->get('categories'); 

    foreach ($categories as $categoryId) {
        $category = $em->getRepository('AppBundle:DocumentCategory')->find((int)$categoryId['id']);
        $category->addDocument($document);
        $document->addCategory($category);
        $em->persist($category);            
    }

    $em->persist($document);
    $em->flush();

    $routeOptions = [
        'id' => $document->getId(),
        '_format' => $request->get('_format'),
    ];

    return $this->routeRedirectView('get_document', $routeOptions, Response::HTTP_CREATED);
}

我的形式很简单：

public function buildForm(FormBuilderInterface $builder, array $options) {
    $builder
            ->add('title', TextType::class)
            ->add('body', TextType::class)
    ;         
}