Eccube\Controller\CartController::down PHP Method

    public function down(Application $app, Request $request, $productClassId)
    {
        $this->isTokenValid($app);
        // FRONT_CART_DOWN_INITIALIZE
        $event = new EventArgs(array('productClassId' => $productClassId), $request);
        $app['eccube.event.dispatcher']->dispatch(EccubeEvents::FRONT_CART_DOWN_INITIALIZE, $event);
        try {
            log_info('カート減算処理開始', array('product_class_id' => $productClassId));
            $productClassId = $event->getArgument('productClassId');
            $app['eccube.service.cart']->downProductQuantity($productClassId)->save();
            // FRONT_CART_UP_COMPLETE
            $event = new EventArgs(array('productClassId' => $productClassId), $request);
            $app['eccube.event.dispatcher']->dispatch(EccubeEvents::FRONT_CART_DOWN_COMPLETE, $event);
            if ($event->hasResponse()) {
                return $event->getResponse();
            }
            log_info('カート減算処理完了', array('product_class_id' => $productClassId));
        } catch (CartException $e) {
            log_info('カート減算エラー', array($e->getMessage()));
            // FRONT_CART_DOWN_EXCEPTION
            $event = new EventArgs(array('exception' => $e), $request);
            $app['eccube.event.dispatcher']->dispatch(EccubeEvents::FRONT_CART_DOWN_EXCEPTION, $event);
            if ($event->hasResponse()) {
                return $event->getResponse();
            }
            $app->addRequestError($e->getMessage());
        }
        return $app->redirect($app->url('cart'));
    }