CODEWITHSUNDEEP
phpsymfonydoctrine-ormdoctrine
Twinsen
Twinsen

Reputation: 893

Doctrine event post_persist

I created an event like this:

service.yml

AccountManager:
    class: %AccountManager.class%
    tags:
        - { name: doctrine.event_listener, event: postPersist }

my Subscriber

class AccountManager implements EventSubscriber
{
    public function getSubscribedEvents()
    {
        return array(
            'postPersist',
            'postUpdate',
        );
    }

    public function postUpdate(LifecycleEventArgs $args)
    {
        $this->index($args);
    }

    public function postPersist(LifecycleEventArgs $args)
    {
        $this->index($args);
    }

    public function index(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $entityManager = $args->getEntityManager(); //BREAKPOINT

        if ($entity instanceof User) {

            echo $entity;
        }
    }
}

If i see my code where i added breakpoint, $entityManager = $args->getEntityManager(); i don't find new user in my Database. After all I Have the new user in Database.

From documentation doctrine, i can read

postPersist - The postPersist event occurs for an entity after the entity has been made persistent. It will be invoked after the database insert operations. Generated primary key values are available in the postPersist event.

My questions are

Upvotes: 2

Views: 483

Answers (1)

Crozin
Crozin

Reputation: 44396

Why I don't have new user in my Database during my Event?

That's because DB transaction isn't commited at that time. If you take a look at a hearth of Doctrine, UnitOfWork::commit() function you'll see that in your case following operations are performed:

  1. Dispatch preFlush event.
  2. Dispatch onFlush event.
  3. Open DB transaction.

  4. Call executeInserts()

    1. Performs actual INSERTs.
    2. Dispatch postPersist event.

  5. Commit the transaction. That's the moment when your data becamse visible to others (transactions) in RDBMS.

  6. Dispatch postFlush event.

I don't understand the main difference between Listener/Subscriber. In this case,what is the better?

They are pretty much two different ways to achieve exactly the same. In case of EventListeners you configure them from the outside world, pseudocode:

$ed = new EventDispatcher();
$ed->addListener('some.event', $myObject, 'myMethod'); // $myObject::myMethod listens
                                                       // to some.event

$ed->addSubscriber($myObject); // ask $myObject for events it wants to listen to

// EventDispatcher::addSubscriber could look like this

function addSubscriber(EventSubscriber $object) {
    foreach ($object->getSubscribedEvents() as $event => $method) {
        $this->addListener($event, $object, $method);
    }
}

I would say that both of them are equal in terms of "which one is better" in this case.

Upvotes: 3

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