public function beforeValidate()
 {
     parent::beforeValidate();
     if ($this->isNewRecord) {
         $usuario = $this->id;
     }
     //        else {
     //            $usuario = Yii::app()->user->objeto->id;
     //        }
     if (!empty($this->avatar)) {
         // $avatar = date('YmdHi') . '.' . $this->avatar->extensionName;
         $avatar = '60x80.' . $this->avatar->extensionName;
         $fileFullPath = Yii::getPathOfAlias('webroot') . "/docs/usuario/{$usuario}/avatar/{$avatar}";
         if (!is_writable(dirname($fileFullPath))) {
             U::mkdir(dirname($fileFullPath));
         }
         $this->avatar->saveAs($fileFullPath);
         $this->avatar = $avatar;
     }
     return true;
 }