$errorMessages = [];
         $event = new EventArgs(
            [
                'Product' => $Product,
            ],
            $request
         );
        $this->eventDispatcher->dispatch(EccubeEvents::FRONT_PRODUCT_CART_ADD_INITIALIZE, $event);

         $this->cartService->addProduct($ring_product_class->getId()); 

         $Cart = $this->cartService->getCart();
         $result = $this->purchaseFlow->validate($Cart, new PurchaseContext($Cart, $this->getUser()));
         
         
         if($result->hasError()){
            $this->cartService->removeProduct($ring_product_class->getId());
            foreach ($result->getErrors() as $error) {
               $errorMessages[] = $error->getMessage();
           }
            foreach ($result->getWarning() as $warning) {
               $errorMessages[] = $warning->getMessage();
            }

         }

         $this->cartService->save();

         $event = new EventArgs(
            [
                'Product' => $Product,
            ],
            $request
         );
         $this->eventDispatcher->dispatch(EccubeEvents::FRONT_PRODUCT_CART_ADD_COMPLETE, $event);