Adding new FOSUserBundle users to a default group on creation - symfony

Question

I'm building my first serious Symfony2 project. I'm extending the FOSUserBundle for my user/group management, and I'd like new users to be automatically added to a default group.
I guess you just have to extend the User entity constructor like this :
/**
* Constructor
*/
public function __construct()
{
parent::__construct();
$this->groups = new \Doctrine\Common\Collections\ArrayCollection();
// Get $defaultGroup entity somehow ???
...
// Add that group entity to my new user :
$this->addGroup($defaultGroup);
}
But my question is how do I get my $defaultGroup entity in the first place?
I tried using the entity manager from within the entity, but then I realized it was stupid, and Symfony was throwing an error. I googled for this, but found no real solution except maybe setting up a service for that... although this seems quite unclear for me.

Answer 1

OK, I started working on implementing artworkad's idea.
First thing I did was updating FOSUserBundle to 2.0.*#dev in composer.json, because I was using v1.3.1, which doesn't implement the FOSUserEvents class. This is required to subscribe to my registration event.
// composer.json
"friendsofsymfony/user-bundle": "2.0.*#dev",
Then I added a new service :
<!-- Moskito/Bundle/UserBundle/Resources/config/services.xml -->
<service id="moskito_bundle_user.user_creation" class="Moskito\Bundle\UserBundle\EventListener\UserCreationListener">
<tag name="kernel.event_subscriber" alias="moskito_user_creation_listener" />
<argument type="service" id="doctrine.orm.entity_manager"/>
</service>
In the XML, I told the service I needed access to Doctrine through an argument doctrine.orm.entity_manager. Then, I created the Listener :
// Moskito/Bundle/UserBundle/EventListener/UserCreationListener.php
<?php
namespace Moskito\Bundle\UserBundle\EventListener;
use FOS\UserBundle\FOSUserEvents;
use FOS\UserBundle\Event\FormEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Doctrine\ORM\EntityManager;
/**
* Listener responsible to change the redirection at the end of the password resetting
*/
class UserCreationListener implements EventSubscriberInterface
{
protected $em;
protected $user;
public function __construct(EntityManager $em)
{
$this->em = $em;
}
/**
* {#inheritDoc}
*/
public static function getSubscribedEvents()
{
return array(
FOSUserEvents::REGISTRATION_SUCCESS => 'onRegistrationSuccess',
);
}
public function onRegistrationSuccess(FormEvent $event)
{
$this->user = $event->getForm()->getData();
$group_name = 'my_default_group_name';
$entity = $this->em->getRepository('MoskitoUserBundle:Group')->findOneByName($group_name); // You could do that by Id, too
$this->user->addGroup($entity);
$this->em->flush();
}
}
And basically, that's it !
After each registration success, onRegistrationSuccess() is called, so I get the user through the FormEvent $event and add it to my default group, which I get through Doctrine.

Answer 2

You did not say how your users are created. When some admin creates the users or you have a custom registration action, you can set the group in the controller's action.
$user->addGroup($em->getRepository('...')->find($group_id));
However if you use fosuserbundles build in registration you have to hook into the controllers: https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Resources/doc/controller_events.md and use a event listener.