Is there a way to specify Doctrine2 Entitymanager implementation class in Symfony2?

Question

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

So I\'m wond

Answer 1

At least in Doctrine/ORM 2.4, the doc string of the EntityManager class explicitly discourages inheriting from Doctrine\ORM\EntityManager, instead they suggest inheriting from Doctrine\ORM\Decorator\EntityManagerDecorator:

/**
 * The EntityManager is the central access point to ORM functionality.
 * ...
 * You should never attempt to inherit from the EntityManager: Inheritance
 * is not a valid extension point for the EntityManager. Instead you
 * should take a look at the {@see \Doctrine\ORM\Decorator\EntityManagerDecorator}
 * and wrap your entity manager in a decorator.
 * ...
 */
/* final */class EntityManager implements EntityManagerInterface
{
    ...

So, extend EntityManagerDecorator and make whatever changes you need. You will need to implement the create() factory method, but you don't need to copy EntityManager's implementation now:

use Doctrine\ORM\Decorator\EntityManagerDecorator;
use Doctrine\Common\EventManager;
use Doctrine\ORM\Configuration;

class MyEntityManager extends EntityManagerDecorator
{
    /**
     * {@inheritDoc}
     */
    public function persist($entity)
    {
        // do something interesting
        parent::persist($entity);
    }

    public function create($conn, Configuration $config, EventManager $eventManager = null)
    {
        return new self(\Doctrine\ORM\EntityManager::create($conn, $config, $eventManager));
    }
}

Then override the doctrine.orm.entity_manager.class parameter to point to your custom entity manager class.

The docs don't cover everything, in many cases you just have to read the code.