ORM::__unset PHP Method

    public function __unset($key)
    {
        $this->offsetUnset($key);
    }

 public function __unset($column)
 {
     $this->load_prefs();
     if (array_key_exists($column, $this->_prefs)) {
         unset($this->_prefs);
     } else {
         parent::__unset($column);
     }
 }