public function index(Application $app, Request $request)
    {
        …

        // 今月の購入回数
        $buy_times = 0;
        if ($app->isGranted('ROLE_USER')) {
            $buy_times = $app['eccube.repository.order']->getCustomerOrderCountThisMonth($app->user());
        }

        …
    }

    /**
     * 会員の今月の購入回数を取得
     *
     * @param  \Eccube\Entity\Customer $Customer
     * @return integer
     */
    public function getCustomerOrderCountThisMonth(\Eccube\Entity\Customer $Customer)
    {
        …

        return 0;
    }