无法在 API POST 调用中包含实体集合

Question

有问题的错误：

Entity of type App\Entity\Nutt is missing an assigned ID for field  'squirrel'.
The identifier generation strategy for this entity requires the ID field to be populated before EntityManager#persist() is called.
If you want automatically generated identifiers instead you need to adjust the metadata mapping accordingly.

我完全能够调用 api POST 将 Squirrel 实体添加到数据库中。 并且使用这个 Squirrel 的 id，我可以对 Nutt 实体执行 POST 调用，结果是 Nutt 表中正确相关的记录。

我似乎无法开始工作的是，允许 Squirrel api 调用包含我想在同一个 api 调用中插入的相关 Nutts 集合。

我做错了什么？

JSON 调用：

{
    "name": "Jake",
    "nutts": [
        {
            "size": 10,
            "color": "blue"
        }
    ]
}

实体松鼠

/**
 * @ORM\Entity
 * @ORM\Table(name="squirrel")
 */
class Squirrel {
  /**
   * @ORM\Column(type="integer")
   * @ORM\Id
   * @ORM\GeneratedValue(strategy="AUTO")
   */
  private $id;
  /**
   * @ORM\Column(type="string", length=100)
   * @Assert\NotBlank()
   *
   */
  private $name;
  /**
   * @ORM\OneToMany(targetEntity="App\Entity\Nutt", mappedBy="squirrel", cascade={"persist", "remove"})
   */
  private $nutts;
  public function __construct()
  {
    $this->nutts = new \Doctrine\Common\Collections\ArrayCollection();
  }
  public function getId()
  {
    return $this->id;
  }
  public function setId($id)
  {
    $this->id = $id;
  }
  public function getName()
  {
    return $this->name;
  }
  public function setName($name)
  {
    $this->name = $name;
  }
  public function getNutts(): ?Collection
  {
    return $this->nutts;
  }
  public function setNutts(Collection $nutts)
  {
    foreach ($nutts as $nutt)
    {
      $this->nutts->add($nutt);
    }
  }
  public function addNutt(Nutt $nutt): Squirrel
  {
    $this->nutts->add($nutt);
    return $this;
  }
}

实体松鼠已更新。
setNutts 已更改为：

public function setNutts(Collection $nutts)
{
  foreach ($nutts as $nutt)
  {
    $nutt->setSquirrel($this);
    $this->nutts->add($nutt);
  }
}

实体坚果

/**
 * @ORM\Entity
 * @ORM\Table(name="nutt")
 */
class Nutt {
  /**
   * @ORM\ManyToOne(targetEntity="App\Entity\Squirrel", inversedBy="nutts")
   * @ORM\Id
   */
  private $squirrel;
  /**
   * @ORM\Column(type="integer")
   * @ORM\Id
   */
  private $size;
  /**
   * @ORM\Column(type="text")
   * @Assert\NotBlank()
   */
  private $color;
  /**
   * @return Squirrel|null
   */
  public function getSquirrel(): ?Squirrel
  {
    return $this->squirrel;
  }
  /**
   * @param Squirrel|null $squirrel
   * @return $this
   */
  public function setSquirrel(?Squirrel $squirrel): self
  {
    $this->squirrel = $squirrel;
    return $this;
  }
  //getters and setters for the rest
}

Entity Nutt 已更新。 属性 $squirrel 已删除其 id 符号，因为它是一个关系：

/**
 * @ORM\ManyToOne(targetEntity="App\Entity\Squirrel", inversedBy="nutts")
 */
private $squirrel;

松鼠控制器

/**
 * Squirrel controller.
 * @Route("/api", name="api_")
 */
class SquirrelController extends AbstractFOSRestController
{
  /**
   * Lists all Squirrels.
   * @Rest\Get("/squirrels")
   * @return Response
   */
  public function getSquirrelAction()
  {
    $repository = $this->getDoctrine()->getRepository(Squirrel::class);
    $squirrels = $repository->findall();
    return $this->handleView($this->view($squirrels));
  }
  /**
   * Create Squirrel.
   * @Rest\Post("/squirrel")
   *
   * @return Response
   */
  public function postSquirrelAction(Request $request)
  {
    $squirrel = new Squirrel();
    $form = $this->createForm(SquirrelType::class, $squirrel);
    $data = json_decode($request->getContent(), true);
    $form->submit($data);
    if ($form->isSubmitted() && $form->isValid()) {
      $em = $this->getDoctrine()->getManager();
      $em->persist($squirrel);
      $em->flush();
      return $this->handleView($this->view(['status' => 'ok'], Response::HTTP_CREATED));
    }
    return $this->handleView($this->view($form->getErrors()));
  }
}

还有我目前的重点 松鼠形态

class SquirrelType extends AbstractType
{
  public function buildForm(FormBuilderInterface $builder, array $options)
  {
    $builder
      ->add('name')
      ->add(
        'nutts',
        CollectionType::class, [
          'entry_type' => NuttType::class,
          'allow_add' => true,
          'by_reference' => false
        ])
      ->add('save', SubmitType::class);
  }
  public function configureOptions(OptionsResolver $resolver)
  {
    $resolver->setDefaults(array(
      'data_class' => Squirrel::class,
      'csrf_protection' => false
    ));
  }
}

有一个疯狂的形式，但它工作正常。

@mel 在评论中解决了问题

Answer 1

Id annotation 将该列声明为主键，因此它成为强制性的。但在这种情况下不需要它，因为squirrel 是一个关系。

错误本身也暗示保存实体时该字段为空，因此没有调用setSquirrel。

您也可以从size 中删除注释。