Symfony2 + SonataAdminBundle: Error on updating User's roles (many-to-many) - symfony

Question

Entities:
User:
class User implements AdvancedUserInterface, \Serializable
{
...
/**
* #ORM\ManyToMany(targetEntity="Role", inversedBy="users")
* #ORM\JoinTable(name="users_roles")
*
*/
private $roles;
...
}
Role:
class Role implements RoleInterface
{
...
/**
* #ORM\ManyToMany(targetEntity="User", mappedBy="roles")
*/
private $users;
public function __construct()
{
$this->users = new ArrayCollection();
}
public function __toString()
{
return $this->getName();
}
...
}
Admin classes:
UsersAdmin:
<?php
namespace Lan\ConsoleBundle\Admin;
use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Form\FormMapper;
use Sonata\AdminBundle\Datagrid\DatagridMapper;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Show\ShowMapper;
use Knp\Menu\ItemInterface as MenuItemInterface;
class UsersAdmin extends Admin
{
protected function configureShowField(ShowMapper $showMapper)
{
$showMapper
->add('id', null, array('label' => 'ID'))
->add('username', null, array('label' => 'Name'))
->add('password', null, array('label' => 'Password'))
->add('email', null, array('label' => 'Mail'))
->add('is_active', null, array('label' => 'Active', 'required' => false))
->add('roles');
}
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper
->with('General')
->add('username', null, array('label' => 'Name'))
->add('password', null, array('label' => 'Password'))
->add('email', null, array('label' => 'Mail'))
->add('is_active', 'checkbox', array('label' => 'Active', 'required' => false))
->end()
->with('Roles')
->add('roles', 'sonata_type_model',array('expanded' => true, 'compound' => true, 'multiple' => true))
->end();
}
}
RolesAdmin:
<?php
namespace Lan\ConsoleBundle\Admin;
use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Form\FormMapper;
use Sonata\AdminBundle\Datagrid\DatagridMapper;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Show\ShowMapper;
use Knp\Menu\ItemInterface as MenuItemInterface;
class RolesAdmin extends Admin
{
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper
->add('name', null, array('label' => 'Заголовок'))
->add('role', null, array('label' => 'Роль'));
}
}
Screenshot:
http://img577.imageshack.us/img577/3565/jyte.png
After updating User i get this error message:
FatalErrorException: Error: Call to a member function add() on a
non-object in
\vendor\sonata-project\doctrine-orm-admin-bundle\Sonata\DoctrineORMAdminBundle\Model\ModelManager.php line 560
I think this error occurs because the object instead of 'Role' value is passed to the function Role-> __toString (). How can I solve this problem?

Answer 1

Try something arround this code:
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper
->add('name', null, array('label' => 'Заголовок'))
->add('Product' , 'entity' , array(
'class' => 'LanConsoleBundle:Role' ,
'property' => 'name' ,
'expanded' => true ,
'multiple' => true , ))
}