Symfony add event listener

Question

I use symfony and easy admin and I want to listen event easy_admin.pre_persist.

In easy admin controller it calls this event like this:

$this->dispatch(EasyAdminEvents::PRE_PERSIST, array('entity' => $entity));

and this consts:

/** @Event("Symfony\Component\EventDispatcher\GenericEvent") */
const PRE_PERSIST = 'easy_admin.pre_persist';

If I in the same controller add listener for this event like this:

    $ed = $this->get('event_dispatcher');

    $ed->addListener('easy_admin.pre_persist', function($e) {
        echo 'it works!';
        die();
    });

...it works.

But I want to add this listener in something other place. I think services.yml will be good place for it. I've read in Sf documentation i should add service this way:

# app/config/services.yml
services:
    app.exception_listener:
        class: AppBundle\EventListener\ExceptionListener
        tags:
            - { name: kernel.event_listener, event: kernel.exception }

but there is 2 properies - name and event. I know only event name, easy_admin.pre_persist.

How it works? What is name for this event and what is event? If I can add listener for easy_admin.pre_persist how can I add this listener to services.yml?

BentCoder · Accepted Answer · 2016-07-11 15:37:59Z

I'll give you a very simple example but you need to adapt it to yours. It should be fairly simple. It will just give you a fair idea, not a real life example.

For more examples: http://www.inanzzz.com/index.php/posts/symfony

UserController.php

class UserController
{
    ....

    public function createAction()
    {
        $user = new User();
        $user->setUsername('username');
        $user->setPassword('password');

        $this->entityManager->persist($user);
        $this->entityManager->flush();
    }

    ....
}

Services.yml

services:
    application_backend.listener.user_entity:
        class: Application\BackendBundle\Listener\UserEntityListener
        tags:
                - { name: doctrine.event_listener, event: prePersist }

UserControllerListener.php

namespace Application\BackendBundle\Listener;

use Application\BackendBundle\Entity\User;
use Doctrine\ORM\Event\LifecycleEventArgs;

class UserEntityListener
{
    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        if ($entity instanceof User) {
            // Do whatever you want
        }
    }
}

Massimiliano Arione · Accepted Answer · 2016-07-07 11:28:01Z

2

You need to know the class of the listener and the name of the method to call. Both are depending on easy admin (sorry, never used it). So look into easy admin's code

answered Jul 7, 2016 at 11:28

Massimiliano Arione

2,50320 silver badges40 bronze badges

Comments

Edu · Accepted Answer · 2016-07-07 16:20:38Z

1

You can see in the event definition you posted that use symfony generic events, so you should listen to the kernel and the tag name property should be kernel.event_listener

# app/config/services.yml
services:
    app.exception_listener:
        class: YourBundle\EventListener\EasydminPrePersitListener
        tags:
            - { name: kernel.event_listener, event: easy_admin.pre_persist, method: onPrePersist }

And in the Listener class you mus define a method onPrePersist()

answered Jul 7, 2016 at 16:20

Edu

2,5301 gold badge17 silver badges15 bronze badges

Collectives™ on Stack Overflow

Symfony add event listener

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related