Symfony2 user registration mockup

RegistrationController.php

<?php

namespace Problematic\UserBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;

use Problematic\UserBundle\Entity\User;

class RegistrationController extends Controller
{
    public function registerAction()
    {
        $em = $this->get('doctrine')->getEntityManager();
        $request = $this->get('request');

        $user = new User();        
        $form = $this->get('form.factory')->create(new UserType(), $user);

        if ('POST' == $request->getMethod()) {
            $form->bindRequest($request);

            $user->setSalt(/* some salt you've generated */);
            $user->setRoles(array('ROLE_USER'));

            $factory = $this->container->get('security.encoder_factory');
            $encoder = $factory->getEncoder($user);
            $password = $encoder->encodePassword($user->getPassword(), $user->getSalt()); //where $user->password has been bound in plaintext by the form
            $user->setPassword($password);

            if ($form->isValid()) {
                $em->persist($user);
                $em->persist($profile);
                $em->flush();
                
                // creates a token and assigns it, effectively logging the user in with the credentials they just registered
                $token = new UsernamePasswordToken($user, null, 'main');
                $this->get('security.context')->setToken($token);

                return $this->redirect($this->generateUrl('Problematic_UserBundle_registration_thanks'));
            }
        }
        
        return $this->render('ProblematicUserBundle:Registration:register.html.twig', array(
            'form'  =>  $form->createView(),
        ));
    }
}

security.yml

security:
  encoders:
    Problematic\UserBundle\Entity\User: sha512
  # ...
  providers:
    main:
      entity: { class: Problematic\UserBundle\Entity\User, property: username }
  # ...

User.php

<?php

namespace Problematic\UserBundle\Entity;

use Symfony\Component\Security\Core\User\UserInterface;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class User implements UserInterface
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     */
    protected $id;

    /**
     * @ORM\Column(type="array")
     */
    protected $roles;

    // ... rest of the User entity, including implementations for methods inherited from UserInterface

}