我正在尝试在管理面板蛋糕php

Question

if (!empty($this->data)) {
    $this->Category->create();
    if ($this->Category->save($this->data)) {
        $this->Session->setFlash(__('The category has been saved', true));
        $this->redirect(array('action' => 'index'));
    } else {
        $this->Session->setFlash(__('The category could not be saved. Please, try again.', true));
    }
}
$parentCategories = $this->Category->ParentCategory->find('list');

$this->set(compact('parentCategories'));

此代码运行良好我在$parentCategories中获取了类别名称，但在add函数中它没有在字段中获取数据