想在cakephp 3中获得子类别产品吗

我有树状结构的分类表和产品表。我想在列表中显示。当用户单击父类别时，我希望显示该类别的所有产品以及该类别的子类别的产品

 public function listing($catid = null, $slug = null)
    {
        $this->viewBuilder()->layout('frontview');
        $this->loadModel('Categories');
        $this->loadModel('Products');        
        $categoryid=$this->Categories->find('children',['for'=>$catid]);
        $catarray=array();
        foreach($categoryid as $c) {
            $catarray[]=$c['categoryId'];
        }
        debug($catarray);
        $products=$this->Products->find()
            ->where(function ($exp, $q) {
        return $exp->in('categories_id',$catarray); //line 81
    });
       $this->set('products',$products);

    }

$catarray的调试正在进行中

[
    (int) 0 => (int) 6,
    (int) 1 => (int) 7,
    (int) 2 => (int) 8,
    (int) 3 => (int) 9,
    (int) 4 => (int) 10,
    (int) 5 => (int) 11,
    (int) 6 => (int) 12
]

错误：注意（8）：未定义变量：catarray[APP/Controller\CategoriesController.php，第81行]

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错误：无法生成字段（类别id）值为空的条件

function ($exp, $q) uses(catarray)

但您也可以通过以下方式简化代码：

$categoryid=$this->Categories->find('children',['for'=>$catid]);
$catarray = $categoryid->extract('categoryId');
$products=$this->Products->find()
    ->where(['category_id IN' => $catarray]);

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该通知是由于未将其传递给匿名函数而引起的。看见