NodesController::admin_edit PHP Method

    public function admin_edit($id = null)
    {
        if (!$id && empty($this->request->data)) {
            $this->Session->setFlash(__d('croogo', 'Invalid content'), 'flash', array('class' => 'error'));
            return $this->redirect(array('action' => 'index'));
        }
        $Node = $this->{$this->modelClass};
        $Node->id = $id;
        $typeAlias = $Node->field('type');
        $type = $Node->Taxonomy->Vocabulary->Type->findByAlias($typeAlias);
        if (!empty($this->request->data)) {
            if ($Node->saveNode($this->request->data, $typeAlias)) {
                Croogo::dispatchEvent('Controller.Nodes.afterEdit', $this, compact('data'));
                $this->Session->setFlash(__d('croogo', '%s has been saved', $type['Type']['title']), 'flash', array('class' => 'success'));
                $this->Croogo->redirect(array('action' => 'edit', $Node->id));
            } else {
                $this->Session->setFlash(__d('croogo', '%s could not be saved. Please, try again.', $type['Type']['title']), 'flash', array('class' => 'error'));
            }
        }
        if (empty($this->request->data)) {
            $this->Croogo->setReferer();
            $data = $Node->read(null, $id);
            if (empty($data)) {
                throw new NotFoundException('Invalid id: ' . $id);
            }
            $data['Role']['Role'] = $Node->decodeData($data[$Node->alias]['visibility_roles']);
            $this->request->data = $data;
        }
        $this->set('title_for_layout', __d('croogo', 'Edit %s: %s', $type['Type']['title'], $this->request->data[$Node->alias]['title']));
        $this->_setCommonVariables($type);
    }