public function __set($column, $value)
{
switch ($column) {
case 'left':
return parent::__set($this->_left_column, $value);
break;
case 'right':
return parent::__set($this->_right_column, $value);
break;
case 'parent':
return parent::__set($this->_parent_column, $value);
break;
case 'children':
case 'parents':
case 'descendants':
return;
break;
}
return parent::__set($column, $value);
}