[symfony-users] [Symfony2] - entity manager in forms

[jdewit]

I'm trying to use the entityToIdTransformer in a form so I can populate a 
choiceField dynamically.

Here's my code.

namespace Sensio\HelloBundle\Form;

use Symfony\Component\Form\Form;
use 
Symfony\Bundle\DoctrineBundle\Form\ValueTransformer\EntityToIDTransformer;
use Symfony\Component\Form\ChoiceField;


class JobForm extends Form
{
  public function __construct()
  {
    $em = $this->get('doctrine.orm.entity_manager');
  }

    public function configure()
    {
$em = $this->get('doctrine.orm.entity_manager');
        $userChoices = array();
        $users = 
$em->getRepository('Sensio\HelloBundle\Entity\User')->findAll();
        foreach ($users as $user) {
            $userChoices[$user->getId()] = $user->getName();
        }

        $userTransformer = new EntityToIDTransformer(array(
            'em' => $em,
            'className' => 'User',
        ));
        $this->add(new ChoiceField('engineer', array(
            'choices' => $userChoices,
            'value_transformer' => $userTransformer,
        )));
    }
}

I get the error

Field "doctrine.orm.entity_manager" does not exist.


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