public function publishCount()
    {
        $result = array_reduce(
            array_map(
                function ($ProductCategory) {
                    $Product = $ProductCategory->getProduct();
                    if (\Eccube\Util\EntityUtil::isNotEmpty($Product) && $Product->getStatus()->getId() === 1) {
                        return 1;
                    } else {
                        return 0;
                    }
                }, $this->ProductCategories->toArray()),
            function ($carry, $item) {
                return $carry += $item;
            }
        );

        // ▼▼▼▼ 追加 ここから ▼▼▼▼
        $arrayCategory = $this->Children;
        if (count($arrayCategory)) {
            foreach ($arrayCategory as $category) {
                $result += $category->publishCount();
            }
        }
        // ▲▲▲▲ 追加 ここまで ▲▲▲▲

        return $result ? $result : 0;
    }