public function tree()
{
$_tree = Set::model()->findAll(array('order' => $this->leftAttribute));
$left = $this->leftAttribute;
$right = $this->rightAttribute;
$root = $this->rootAttribute;
$level = array();
$ancestors = array();
foreach (self::$_tree as $item) {
$root = $item->root;
if (!isset($ancestors[$root])) {
$ancestors[$root] = array();
}
if (!isset($level[$root])) {
$level[$root] = 1;
}
$item->_ancestors = array();
$ancestors[$root][$item->level] = $item;
foreach ($ancestors[$root] as $l => $node) {
if ($level < $node->level) {
break;
}
if ($node->$left < $item->$left && $node->$right > $item->$right) {
$item->_ancestors[] = $node;
}
}
$level = $item->level;
}
return self::$_tree;
}
