循环更改某一类目下所有数据的状态

        // 获取子节点，并更新子节点状态
        $as = XXXX::query()->where()->get();

        while (true) {
            $categoryCollection = new Collection();
            foreach ($as as $a) {
                $childBackCate['status'] = $status;
                $childBackCate->save();
                // 如果是最后一个节点就修改状态
                if (!$childBackCate['is_last_son']) {
                    // 如果不是最后一个节点就先修改状态，然后获取子节点再修改状态
                    $categories = CategoryBack::query()->where('parent_id', $childBackCate['id'])->get();
                    $categoryCollection = $categoryCollection->merge($categories);
                }
            }
            if (count($categoryCollection) == 0) {
                break;
            }
            $childBackCategoryList = $categoryCollection;
        }