public function post_update_username()
{
$val = Validation::forge();
$val->add_callable('MyRules');
$val->add_field('username', Lang::get('label.username'), 'required|valid_username|min_length[6]|max_length[50]|unique_username');
if ($val->run()) {
$props = array('username' => $val->validated('username'));
if (Model_Base_User::update($this->user_id, $props)) {
Auth::force_login($this->user_id);
$this->data['success'] = Lang::get($this->controller . '.' . $this->action . '.success');
} else {
$this->data['error'] = Lang::get($this->controller . '.' . $this->action . '.error');
}
} else {
$this->data['errors'] = $val->error_message();
}
return $this->response($this->data);
}