Question

我有一个父类MapItem和一个子类MapExhibit。我的MapExhibit类有一个属性$ builiding，它将展览绑定到特定的MapBuilding实体。当API调用JSON时，$ building应该不会出现在MapExhibit实体中。

注意我正在使用willdurand/Hateoas捆绑包

这是我目前的设置：

/**
 * @ORM\Entity(repositoryClass="App\Repository\Map\MapItemRepository")
 * @ORM\InheritanceType("JOINED")
 * @ORM\DiscriminatorColumn(name="discr", type="string")
 * @ORM\DiscriminatorMap({"item" = "MapItem", "bathroom" = "MapBathroom", "building" = "MapBuilding", "bus" = "MapBus", "emergency" = "MapEmergency", "exhibit" = "MapExhibit", "parking" = "MapParking"})
 * @Serializer\XmlRoot("mapItem")
 * @Hateoas\Relation("self", href = "expr('/api/mapitems/' ~ object.getId())")
 */
abstract class MapItem
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     * @Serializer\XmlAttribute
    */
    private $id;

    ...
}

/**
 * @ORM\Entity(repositoryClass="App\Repository\Map\MapExhibitRepository")
 *
 * @Hateoas\Relation(
 *    "building",
 *    exclusion = @Hateoas\Exclusion()
 * )
 */
class MapExhibit extends MapItem
{
   ...

   /**
    * Many emergency devices can belong to one building.
    * @ORM\ManyToOne(targetEntity="MapBuilding", inversedBy="emergencyDevices")
    * @ORM\JoinColumn(name="building_id", referencedColumnName="id", nullable=true, onDelete="SET NULL")
    */
   private $building;

   ...

   public function getBuilding(): ?MapBuilding
   {
       return $this->building;
   }
}

结果是一个JSON对象，它包含来自父MapItem的关系

"_links":{"self":{"href":"\/api\/mapitems\/29"}}}]

但也包括展览大楼的数据。这一部分应该被忽略。

Answer 1

Take a look on exclusion strategies in documentation.

If you would like to always expose, or exclude certain properties. Then, you can do this with the annotations @ExclusionPolicy, @Exclude, and @Expose.

The default exclusion policy is to exclude nothing. That is, all properties of the object will be serialized. If you only want to expose a few of the properties, then it is easier to change the exclusion policy, and only mark these few properties: (...)

So basically, put @Serializer\Exclude() above private $builidng. Don't forget to add use JMS\Serializer\Annotation as Serializer; on top.

Symfony 4 with Hateoas：与Child class的关系

1 个答案: