/**
* 返回一个完整的树
*
* @param bool $scope 只返回指定的scope
* @return MPTT[]
*/
public function fullTree($scope = null)
{
$result = new self();
if (!is_null($scope)) {
$result->where($this->_scopeColumn, '=', $scope);
} else {
$result->orderBy($this->_scopeColumn, 'ASC')->orderBy($this->_leftColumn, 'ASC');
}
return $result->findAll();
}
