symfony2 how to override the User class with FosuserBundle? - symfony

Question

My problem is quite simple but i search for an hour without succeed, i would like to add some constraint to the UserEntity. For example, i would like to limit the length of a username
I think the best way is to not touche FOS in Vendor. I have create my own userBundle with my own layout.html etc ... But i cannot override attribut who is already existing in FosuserBundle (it's working for the layout overriding btw my userBundle is a child of FOS)
the funny thing is "id" has no problem for the overriding
My User entity :
<?php
namespace Diane\UserBundle\Entity;
use FOS\UserBundle\Model\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;
/**
* User
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="Diane\UserBundle\Entity\UserRepository")
*/
class User extends BaseUser
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #var string
* #ORM\Column(name="username", type="string", length=10)
*/
protected $username;
}
Fos User model :
<?php
namespace FOS\UserBundle\Model;
use Doctrine\Common\Collections\Collection;
use Doctrine\Common\Collections\ArrayCollection;
abstract class User implements UserInterface, GroupableInterface
{
protected $id;
/**
* #var string
*/
protected $username;
...
}
i have already try to remove :
/**
* #var string
*/
Error message :
Doctrine\ORM\Mapping\MappingException] Duplicate definition of column
'username' on entity 'Diane\UserBundle\Entity\User' in a field or
discriminator column mapping.
Thanks for any idea you could give me

Answer 1

Try AttributeOverrides Doctrine annotation:
/**
* User
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="Diane\UserBundle\Entity\UserRepository") / class User extends
*
* #ORM\AttributeOverrides({
* #ORM\AttributeOverride(name="username",
* column=#ORM\Column(
* name = "username",
* type = "string",
* length = 10
* )
* )
* })
*
*/
class User extends BaseUser
{