doctrine targetEntity接口

时间:2013-01-16 13:39:26

标签: zend-framework doctrine

我正在尝试将接口用作“targetEntity”。 简单的代码应该解释我打算做什么

接口:

namespace Project\Entity;

interface AnimalInterface{


}

猫:

namespace Project\Entity;
use Doctrine\ORM\Mapping as ORM;
use Project\Entity\AnimalInterface;

/**
 * Represents an Invoice.
 *
 * @ORM\Entity
 * @ORM\Table(name="Cat")
 */
class Cat implements AnimalInterface  {

     /**
     * @var int
     * @ORM\Id @ORM\Column(type="integer", name="id")
     * @ORM\GeneratedValue
     */
     protected $id;
}

犬:

namespace Project\Entity;
use Doctrine\ORM\Mapping as ORM;
use Project\Entity\AnimalInterface;

/**
 * @ORM\Entity
 * @ORM\Table(name="Dog")
 */
class Dog implements AnimalInterface  {

     /**
     * @var int
     * @ORM\Id @ORM\Column(type="integer", name="id")
     * @ORM\GeneratedValue
     */
     protected $id;
}

AnimalFarm(可以只包含一只动物;)):

 namespace Project\Entity;
 use Doctrine\ORM\Mapping as ORM;

 /**
 * @ORM\Entity
 * @ORM\Table(name="AnimalFarm")
 */
class AnimalFarm  {
    /**
     *
     * @var int
     * @ORM\Id @ORM\Column(type="integer", name="id")
     * @ORM\GeneratedValue
     */
     protected $id;

     /**
     * @ORM\ManyToOne(targetEntity="Project\Entity\AnimalInterface")
     * @var AnimalInterface
     */
     protected $animal;


     public function setAnimal(AnimalInterface $animal){
         $this->animal = $animal;
     }
}

我正在使用此处指定的TargetEntityResolver - > http://symfony.com/doc/master/cookbook/doctrine/resolve_target_entity.html

bootstrap.php(Zend):

    $em = $doctrine->getEntityManager();
    $evm = $em->getEventManager();

    $listener = new  \Doctrine\ORM\Tools\ResolveTargetEntityListener();
    $listener->addResolveTargetEntity(
            'Project\Entity\AnimalInterface',
            'Project\Entity\Dog',
            array()
    );
    $listener->addResolveTargetEntity(
            'Project\Entity\AnimalInterface',
            'Project\Entity\Cat',
            array()
    );
    $evm->addEventListener(Doctrine\ORM\Events::loadClassMetadata, $listener);

似乎解析器只能将一个实体解析为接口,第一个给定的接口。在这个例子中猫。 Doctrine构建表AnimalFarm与表狗的关系(foreignkey)。 当我试图通过EntityManager将狗添加到表时,Doctrine失败并出现以下ErrorMessage: 未捕获的异常'Doctrine \ ORM \ ORMException',消息'在Project \ Entity \ AnimalFarm#animal上找到类型为Project \ Entity \ Dog的实体,但期待[...]

中的Project \ Entity \ Cat'

似乎无法通过接口定义多个targetEntities?

我不想使用继承,因为实体可以实现多个接口。 (不可能有多重继承)

有什么想法吗?

我可以寻找好的搜索关键字吗?

非常感谢。

1 个答案:

答案 0 :(得分:1)

这取自doctrine2 docs。您只能使用此方法解析一个对象。

/**
 * An interface that the invoice Subject object should implement.
 * In most circumstances, only a single object should implement
 * this interface as the ResolveTargetEntityListener can only
 * change the target to a single object.
 */
interface InvoiceSubjectInterface
{
    // List any additional methods that your InvoiceModule
    // will need to access on the subject so that you can
    // be sure that you have access to those methods.

    /**
     * @return string
     */
    public function getName();
}