Disable Doctrine 2 lazy loading when using JMS Serializer?

Question

Im using Doctrine 2 ORM in my Zend project and need to serialize my Entities to JSON in several cases.

ATM i use the Querybuilder and join all tables i need. But my serializer causes doctrine to lazy load every associated Entity which results in pretty huge data amounts and provokes recursion.

Now im looking for a way to totally disable Doctrines lazy loading behavior.

My way to select data would be the following:

$qb= $this->_em->createQueryBuilder()
            ->from("\Project\Entity\Personappointment", 'pa')
            ->select('pa', 't', 'c', 'a', 'aps', 'apt', 'p')
            ->leftjoin('pa.table', 't')
            ->leftjoin('pa.company', 'c')
            ->leftjoin('pa.appointment', 'a')
            ->leftjoin('a.appointmentstatus', 'aps')
            ->leftjoin('a.appointmenttype', 'apt')
            ->leftjoin('a.person','p')

I would like my resultset to only contain the selected tables and associations.

Any help would be greatly appreciated.

Answer 1

In the latest version of JMSSerializer, the place you should look at is

JMS\Serializer\EventDispatcher\Subscriber\DoctrineProxySubscriber

instead of

Serializer\Handler\DoctrineProxyHandler

To override the default lazy load behavior, one should define his own event subscriber.

In your app/config.yml add this:

parameters:
    ...
    jms_serializer.doctrine_proxy_subscriber.class: Your\Bundle\Event\DoctrineProxySubscriber

you can copy the class from JMS\Serializer\EventDispatcher\Subscriber\DoctrineProxySubscriber to Your\Bundle\Event\DoctrineProxySubscriber and comment out the $object->__load(); line

public function onPreSerialize(PreSerializeEvent $event)
{
    $object = $event->getObject();
    $type = $event->getType();

    // If the set type name is not an actual class, but a faked type for which a custom handler exists, we do not
    // modify it with this subscriber. Also, we forgo autoloading here as an instance of this type is already created,
    // so it must be loaded if its a real class.
    $virtualType = ! class_exists($type['name'], false);

    if ($object instanceof PersistentCollection) {
        if ( ! $virtualType) {
            $event->setType('ArrayCollection');
        }

        return;
    }

    if ( ! $object instanceof Proxy && ! $object instanceof ORMProxy) {
        return;
    }

     //$object->__load(); Just comment this out

    if ( ! $virtualType) {
        $event->setType(get_parent_class($object));
    }
}