我正在开发一个复杂的Symfony项目,它将Doctrine ORM对象与Doctrine PHPCR-ODM文档混合在一起。一切正常,但我无法解决容器中侦听器之间的循环依赖注入问题。
场景是,我有多个ODM文档在加载时设置ORM引用,这是通过事件监听器完成的。示例配置是:
services.yml
:
example.event_listener.my_document:
class: Example\Common\EventListener\MyDocumentEventListener
arguments: [@doctrine]
tags:
- { name: doctrine_phpcr.event_listener, event: postLoad }
- { name: doctrine_phpcr.event_listener, event: prePersist }
Example\Common\EventListener\MyDocumentEventListener.php
:
namespace Example\Common\EventListener;
use Example\Common\ODM\Document\MyDocument;
use Doctrine\Common\Persistence\Event\LifecycleEventArgs;
use Doctrine\Common\Persistence\ManagerRegistry;
use Doctrine\ODM\PHPCR\DocumentManager;
/**
* Listener for {@link Example\Common\ODM\Document\MyDocument} events.
*/
class MyDocumentEventListener
{
/*
* @var Doctrine\Common\Persistence\ManagerRegistry
*/
private $managerRegistry;
/**
* Constructor.
*
* @param Doctrine\Common\Persistence\ManagerRegistry $documentManager A Doctrine {@link Doctrine\Common\Persistence\ManagerRegistry}.
*/
public function __construct(ManagerRegistry $managerRegistry)
{
$this->managerRegistry = $managerRegistry;
}
/**
* After loading a document, ensure that the references exist
* to each ORM dependency.
*
* @param Doctrine\Common\Persistence\Event\LifecycleEventArgs $args
*/
public function postLoad(LifecycleEventArgs $args)
{
if (get_class($args->getObject()) == 'Example\Common\ODM\Document\MyDocument') {
$this->loadDependencies($args->getObject(), $args->getObjectManager());
}
}
/**
* Prior to persisting a document, ensure that the references exist
* to each ORM dependency.
*
* @param Doctrine\Common\Persistence\Event\LifecycleEventArgs $args
*/
public function prePersist(LifecycleEventArgs $args)
{
if (get_class($args->getObject()) == 'Example\Common\ODM\Document\MyDocument') {
$this->loadDependencies($args->getObject(), $args->getObjectManager());
}
}
/**
* Pull relational information from the ORM database to populate
* those fields in the {@link Example\Common\ODM\Document\MyDocument} document that
* require it. Each field is populated as a reference, so it will be
* loaded from the database only if necessary.
*
* @param Example\Common\ODM\Document\MyDocument $document The MyDocument to load dependencies for.
* @param Doctrine\ODM\PHPCR\DocumentManager $documentManager The DocumentManager for the MyDocument.
*/
private function loadDependencies(MyDocument $document, DocumentManager $documentManager)
{
$reflectionClass = $documentManager->getClassMetadata(get_class($document))->getReflectionClass();
$exampleProperty = $reflectionClass->getProperty('example');
$exampleProperty->setAccessible(true);
$exampleProperty->setValue(
$document,
$this->managerRegistry->getManager()->getReference('Example\Common\ORM\Entity\MyEntity', $document->getExampleId())
);
}
}
使用MyDocument
对象时,上述所有内容都可以正常工作。 (这基本上是用于混合ORM和MongoDB ODM的what is described in the Doctrine documentation的精确实现。)
现在的问题是我还希望在同一个应用程序中执行相反的操作 - 也就是说,我还希望有一个ORM实体,它具有一个填充引用或ODM文档引用的侦听器。 / p>
如果不添加更多代码,请说我将services.yml
配置扩展为:
example.event_listener.my_document:
class: Example\Common\EventListener\MyDocumentEventListener
arguments: [@doctrine]
tags:
- { name: doctrine_phpcr.event_listener, event: postLoad }
- { name: doctrine_phpcr.event_listener, event: prePersist }
example.event_listener.my_entity:
class: Example\Common\EventListener\MyEntityEventListener
arguments: [@doctrine_phpcr]
tags:
- { name: doctrine.event_listener, event: prePersist }
- { name: doctrine.event_listener, event: postLoad }
现在这将失败,因为我们有一个循环依赖:容器尝试将ODM监听器注入DocumentManager
的监听器,而这些监听器又试图注入EntityManager
,反过来又尝试注入自己的侦听器,每个侦听器都尝试注入DocumentManager
,依此类推。 (请注意,此示例使用Registry
而不是管理器,但结果是相同的。)
我已经尝试了几种不同的方法来解决这个问题,但还没有找到可行的方法。有没有人能够让ORM和ODM之间的双向监听器在一个项目中像这样工作?
不幸的是,我发现很少有这方面的例子。到目前为止,我的解决方法是创建一个服务来处理这些对象的加载/持久化,然后通过它运行所有内容,但与使用优雅的事件驱动系统相比,它似乎非常hack。
答案 0 :(得分:0)
根据上面评论中提到的正确答案清理这个旧问题:注入完整的容器。通常我会避免这种情况,但事实证明这是解决这一特定问题的唯一方法。
如果有人正在寻找加载基于ORM的依赖项的ODM监听器的示例,这里是我到达的一个工作示例:
服务定义:
example.event_listener.odm.my_document:
class: Example\Common\EventListener\MyDocumentEventListener
arguments: [@service_container]
tags:
- { name: doctrine_phpcr.event_listener, event: postLoad }
听众:
<?php
namespace Example\Common\EventListener;
use Example\Common\Document\MyDocument;
use Doctrine\Common\Persistence\Event\LifecycleEventArgs;
use Doctrine\ODM\PHPCR\DocumentManager;
use Symfony\Component\DependencyInjection\Container;
class MyDocumentEventListener
{
/*
* @var \Symfony\Component\DependencyInjection\Container
*/
private $container;
/**
* Constructor.
*
* @param \Symfony\Component\DependencyInjection\Container $container A Symfony dependency injection container.
*/
public function __construct(Container $container)
{
$this->container = $container;
}
/**
* After loading a document, ensure that the references exist
* to each ORM dependency.
*
* @param \Doctrine\Common\Persistence\Event\LifecycleEventArgs $args
*/
public function postLoad(LifecycleEventArgs $args)
{
if (get_class($args->getObject()) == 'Example\Common\Document\MyDocument') {
$this->loadDependencies($args->getObject(), $args->getObjectManager());
}
}
/**
* Pull relational information from the ORM database to populate
* those fields in the document that require it. Each field is
* populated as a reference, so it will be loaded from the database only
* if necessary.
*
* @param \Example\Common\Document\MyDocument $document The document to load dependencies for.
* @param \Doctrine\ODM\PHPCR\DocumentManager $documentManager The DocumentManager for the document.
*/
private function loadDependencies(MyDocument $document, DocumentManager $documentManager)
{
$documentReflectionClass = $documentManager->getClassMetadata(get_class($document))->getReflectionClass();
$someOrmProperty = $documentReflectionClass->getProperty('orm_property');
$someOrmProperty->setAccessible(true);
$someOrmProperty->setValue(
$document,
$this->container->get('doctrine.orm.entity_manager')->getReference('Example\Common\Model\MyModel', $document->getOrmPropertyId())
);
}
}
这允许文档类将ID存储到ORM模型实体,并且每次加载文档时,它都会填充文档中对ORM模型的实际引用。这使得它的行为就像它一直都知道ORM属性一样,而且效果很好。
此示例使用PHPCR-ODM,但也适用于MongoDB ODM。