[Deprecated] DMZ 1.6.2 (DataMapper OverZealous Edition)

[eluser]silvergear99[/eluser]
Ok, so I have like this.
Models

Code:

class User extends DataMapper
{
    
    var $has_one = array('group','contact','user');

    var $validation = array
    (
        'username' => array
        (
            'label' => 'Username',
            
            'rules' => array('trim', 'required', 'unique', 'min_length' => 4, 'max_lenght' => 50)
        )
    );
    
    
    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
    
    function __toString()
    {
        return $this->username;
      }
}

class Contact extends Datamapper
{
    
    var $has_one = array('user');
    
    var $validation = array
    (
        'name' => array
        (
            'label' => 'Full name',
            'rules' => array('trim','required', 'min_length' => 5, 'max_length' => 255)
        )
    );
    
    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
    
    function __toString()
    {
        return $this->name;
    }
}

class Group extends Datamapper
{
    var $has_many = array('user');
    var $validation = array
    (
        'name' => array
        (
            'label' => 'Name',
            'type' => 'dropdown',
            'rules' => array('required')
        )
    );
    
    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
    
    function __toString()
    {
        return $this->name;
      }
}

view

Code:

echo $user->render_form
(
    array
    (
        'username',
        'group' => array
        (
            'label' => 'Group',
            'type' => 'dropdown'
        ),
        'contact_name' => array
        (
            'label' => 'Full name',
            'type' => 'text'
        )
    ),
    "admin/users/edit/{$user->id}",
    array
    (
        'save_button' => 'Change'
    )
);

Controller User

Code:

function edit($id = NULL)
    {
        $user = new User();
        $user->where('id',$id);
        $user->include_related('contact',array('name'));
        $user->get();
        
        if($this->input->post('username'))
        {
            $related = $user->from_array($_POST, array('username','group','contact_name'));
            $user->save($related);
        }
        
        $data['main_content'] = 'admin/users/edit_view.php';
        $data['user'] = $user;
        $this->load->view('admin/template.php', $data);
    }

Everything saves except contact_name. Im not getting any errors. Any tips ?