Symfony - Listen im Admin Generator filtern

Einträge in Selectboxen einer foreignTable filtern (z.B. nach creator):

schema.yml:

propel:
    project:
    _attributes:            { phpName: Project }
    id:
    creator_id:                { type: integer, foreignTable: creator foreignReference: id, required: true, onDelete: cascade }  
    name:                   { type: VARCHAR, size: 255, required: true }
    description:            { type: VARCHAR, size: 255, required: true }
...

/lib/model/ProjectPeer.php:

class ProjectPeer extends BaseProjectPeer
{
  public static function getCreatorfiltered() {
		$c = new Criteria();	
      $c->add(ProjectPeer::CREATOR_ID, sfContext::getInstance()->getUser()->getGuardUser()->getId());      //oder Creator ID
    }
		return ProjectPeer::doSelect($c);
	}
}

generator.yml:

..
    fields:         
      project_id:      
        params:
          name:         Project
          peer_method:  getCreatorfiltered