有没有办法在Symfony2中指定Doctrine2 Entitymanager实现类？

问题描述

我目前使用Symfony2和Doctrine2，但我必须重写Doctrine2 EntityManager，并添加一些取消删除功能（内部的ACL）。

I'm currently working with Symfony2 and Doctrine2, but I must override the Doctrine2 EntityManager and add it some "undelete" features (ACLs inside).

'm想知道：有没有办法重写EntityManager类，并在Symfony2中指定Doctrine2以使用它作为EntityManager的实现？

So I'm wondering : is there a way to override the EntityManager class and specify Doctrine2 in Symfony2 to use it as implementation of the EntityManager?

谢谢任何帮助！ p>

Thank you for any help!

推荐答案

是的，可以通过两个步骤：

Yes, it's possible with two steps:

doctrine.orm.entity_manager.class 参数指向您的自定义实体管理器（应扩展 Doctrine\ORM\EntityManager 。）

1 - Override the doctrine.orm.entity_manager.class parameter to point to your custom entity manager (which should extend Doctrine\ORM\EntityManager.)

2 - 您的自定义实体管理器必须覆盖 create 方法，你的班。参见下面的例子，注意最后一行 MyEntityManager ：

2 - Your custom entity manager must override the create method so that it returns an instance of your class. See my example below, and note the last line regarding MyEntityManager:

public static function create($conn, Configuration $config, EventManager $eventManager = null) {
        if (!$config->getMetadataDriverImpl()) {
            throw ORMException::missingMappingDriverImpl();
        }

        if (is_array($conn)) {
            $conn = \Doctrine\DBAL\DriverManager::getConnection($conn, $config, ($eventManager ? : new EventManager()));
        } else if ($conn instanceof Connection) {
            if ($eventManager !== null && $conn->getEventManager() !== $eventManager) {
                throw ORMException::mismatchedEventManager();
            }
        } else {
            throw new \InvalidArgumentException("Invalid argument: " . $conn);
        }

        // This is where you return an instance of your custom class!
        return new MyEntityManager($conn, $config, $conn->getEventManager());
    }

您还需要使用您的类中的以下内容：

You'll also need to use the following in your class:

use Doctrine\ORM\EntityManager;
use Doctrine\ORM\Configuration;
use Doctrine\ORM\ORMException;
use Doctrine\Common\EventManager;
use Doctrine\DBAL\Connection;

说实话，我很惊讶，第二步是必需的，我想这个应该可以实现仅使用服务容器。

To be honest, I'm surprised that the 2nd step is required at all, I would think this should be possible to accomplish using only the service container.

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