NodesController::admin_hierarchy PHP Method

    public function admin_hierarchy()
    {
        $this->Prg->commonProcess();
        if (empty($this->request->query['type'])) {
            $this->Session->setFlash(__d('croogo', 'Type must be specified'), 'flash', array('class' => 'error'));
            return $this->redirect(array('action' => 'index'));
        }
        $Node = $this->{$this->modelClass};
        $Node->recursive = 0;
        $alias = $this->modelClass;
        $conditions = array();
        $type = $Node->Taxonomy->Vocabulary->Type->find('first', array('recursive' => -1, 'conditions' => array('alias' => $this->request->query('type'))));
        $types = $Node->Taxonomy->Vocabulary->Type->find('all');
        $typeAliases = Hash::extract($types, '{n}.Type.alias');
        $criteria = $Node->parseCriteria($this->Prg->parsedParams());
        $nodeTypes = $Node->Taxonomy->Vocabulary->Type->find('list', array('fields' => array('Type.alias', 'Type.title')));
        $nodesTree = $this->Node->generateTreeList($criteria);
        $nodes = array();
        foreach ($nodesTree as $nodeId => $title) {
            $node = $Node->find('first', array('conditions' => array($Node->escapeField('id') => $nodeId)));
            if ($node) {
                $depth = substr_count($title, '_', 0);
                $node['Node']['depth'] = $depth;
                $nodes[] = $node;
            }
        }
        $this->set(compact('nodes', 'type', 'types', 'typeAliases', 'nodeTypes'));
    }