Symfony2/Doctrine2：在侦听器内管理多个实体管理器的问题

我正在按照那个食谱做http://docs.doctrine-project.org/projects/doctrine-mongodb-odm/en/latest/cookbook/blending-orm-and-mongodb-odm.html#event-subscriber当我到达事件订阅者时，我无法注入正确的entity manager，那个名叫$this->dm在构造函数中初始化。

据我了解，正在加载的实体使用的实体管理器可以通过检索$em = $eventArgs->getEntityManager();然后我需要另一个我inject通过以下方式：

    services:
        postload.listener:
        class: myVendor\myFooBarBundle\Listener\myEntityListener
        tags:
            - { name: doctrine.event_listener, event: postLoad }
        arguments:
            - "@doctrine.orm.foobar_entity_manager"
  

这些是我的实体经理：

//orm.yml
        orm:
        entity_managers:
            default:
                connection: default
                mappings:
                    myVendormyFooBarBundle:
                        prefix: "myVendor\myFooBarBundle\Entity"
                        type: annotation
                        is_bundle: true
                        dir: "Entity"
            foobar:
                connection: foobar
                mappings:
                    myVendormyFooBarBundle:
                        prefix: "myVendor\myFooBarBundle\View"
                        type: annotation
                        is_bundle: true
                        dir: "View"
  

When injecting the foobar entity manager使用上述策略我得到以下错误：

Circular reference detected for service "postload.listener", path: "routing.loader -> routing.db.loader -> doctrine.orm.default_entity_manager -> doctrine.dbal.default_connection -> postload.listener -> doctrine.orm.fooba_entity_manager -> doctrine.dbal.foobar_connection".  

That's myVendor\myFooBarBundle\Listener\myEntityListener class:

    class myFooBarEntityListener
    {

        public function __construct( \Doctrine\ORM\EntityManager $em )
        {
            $this->em = $em;
        }

        public function postLoad( LifecycleEventArgs $eventArgs )
        {
            $myEntity = $eventArgs->getEntity();

            if( $myEntity instanceof \myVendor\myFooBarBundle\Entity\myEntity )
            {
                $em = $eventArgs->getEntityManager();
                $fooBarReflProp = $em->getClassMetadata( 'myVendor\myFooBarBundle\Entity\myEntity' )->reflClass->getProperty( 'FooBarEntity' );
                $fooBarReflProp->setAccessible( true );
                $fooBarEntity = $this->em->getRepository( 'myVendor\myFooBarBundle\View\myFooBarEntity' )->findOneBy( array( 'id' => $myEntity->getFooBarEntityId() ) );
                $fooBarReflProp->setValue( $myEntity, $fooBarEntity );
            }
        }
    }
  

也是为了避免circular reference error我试过了not注入foobar entity manager并完成它LifecycleEventArgs $eventArgs:

    class myFooBarEntityListener
    {

        public function postLoad( LifecycleEventArgs $eventArgs )
        {
            $myEntity = $eventArgs->getEntity();

            if( $myEntity instanceof \myVendor\myFooBarBundle\Entity\myEntity )
            {
                $em = $eventArgs->getEntityManager();
                $fooBarReflProp = $em->getClassMetadata( 'myVendor\myFooBarBundle\Entity\myEntity' )->reflClass->getProperty( 'FooBarEntity' );
                $fooBarReflProp->setAccessible( true );
                //NOTICE HOW HERE I SHOULD GET THE PROPER ENTITY MANAGER THROUGH $eventArgs
                $fooBarEntity = $eventArgs->getEntityManager('foobar')->getRepository( 'myVendor\myFooBarBundle\View\myFooBarEntity' )->findOneBy( array( 'id' => $myEntity->getFooBarEntityId() ) );
                $fooBarReflProp->setValue( $myEntity, $fooBarEntity );
            }
        }
    }

  

最后的实现给我带来了以下错误：

An exception has been thrown during the rendering of a template ("Class myVendor\myFooBarBundle\View\myFooBarEntity is not a valid entity or mapped super class.") in "SonataAdminBundle:CRUD:base_list.html.twig" at line 28.

上述错误的原因是$fooBarEntity = $eventArgs->getEntityManager('foobar')->getRepository( 'myVendor\myFooBarBundle\View\myFooBarEntity' )->findOneBy( array( 'id' => $myEntity->getFooBarEntityId() ) );因为当我放置 echo 'hello';die(); 时就在该行之前，不会引发错误，但是当放置在该行之后时，就会引发错误并且hello未显示。这个错误让我认为虽然我明确得到了foobar连接通过$eventArgs->getEntityManager('foobar')它仍然给我default connection/entity manager.

为了再次检查myVendor\myFooBarBundle\View\myFooBarEntity我去的语法octrine\ORM\Mapping\Driver\DriverChain并放置以下代码：

    if( strpos( $className, 'myFooBarEntity' ) )
    {
        echo 'Class: '.$className."\n\n";
        foreach ($this->_drivers as $namespace => $driver)
        {
            echo 'namespace: '.$namespace."\n";
            $bool = strpos($className, $namespace);
            var_dump($bool);
            echo "\n\n";
        }
    }
    die();
  

DriverChain 代码给了我以下内容，这就是为什么我认为“foobar”连接从未使用过或者 symfony 有某种错误解释orm.yml文件定义了实体管理器以及要使用的命名空间。

类： myVendor\myFooBarBundle\View\myFooBarEntity

命名空间：myVendor\myFooBarBundle\Entity 布尔（假）

如果我寻找entity里面的话myVendor\myFooBarBundle\View\myFooBarEntity我刚刚发现@ORM\Entity对于实体定义以及@ORM\OneToMany( targetEntity=.....)用于与另一个实体的关系。

我希望有人能提供帮助，因为这让我发疯。多谢！！

我找到了一个解决方案：

services:
    postload.listener:
    class: myVendor\myFooBarBundle\Listener\myEntityListener
    tags:
        - { name: doctrine.event_listener, event: postLoad }
    arguments:
        - @doctrine

我的听众：

namespace myVendor\myFooBarBundle\Listener\myEntityListener;

use Symfony\Bundle\DoctrineBundle\Registry;

class myFooBarEntityListener
{

    private $reg;

    public function __construct(Registry $reg)
    {
        //dont't put your entitymanager otherwise a loop appear during creation
        $this->reg = $reg;
    }

    public function postLoad( LifecycleEventArgs $eventArgs )
    {
        $myEntity = $eventArgs->getEntity();

        if( $myEntity instanceof \myVendor\myFooBarBundle\Entity\myEntity )
        {

            $em = $this->reg->getEntityManager('not_default');
            $userPointdbManager = $em->getRepository('FullerUserBundle:UserPointdb');

            ....
        }
    }
}

您现在可以使用多个实体管理器。