GraphQL-530: [Cart Operations] Update Cart Items validation messages

Author: naydav

app/code/Magento/QuoteGraphQl/Model/Resolver/UpdateCartItems.php

@@ -16,6 +16,7 @@
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Quote\Api\CartItemRepositoryInterface;
 use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\Quote\Item;
 use Magento\QuoteGraphQl\Model\Cart\GetCartForUser;
 
 /**
@@ -111,24 +112,32 @@ private function processCartItems(Quote $cart, array $items): void
                 $this->cartItemRepository->deleteById((int)$cart->getId(), $itemId);
             } else {
                 $cartItem->setQty($qty);
+                $this->validateCartItem($cartItem);
+                $this->cartItemRepository->save($cartItem);
+            }
+        }
+    }
 
-                if ($cartItem->getHasError()) {
-                    $errors = [];
-                    foreach ($cartItem->getMessage(false) as $message) {
-                        $errors[] = $message;
-                    }
-
-                    if (!empty($errors)) {
-                        throw new GraphQlInputException(
-                            __(
-                                'Could not update the product with SKU %sku: %message',
-                                ['sku' => $cartItem->getSku(), 'message' => __(implode("\n", $errors))]
-                            )
-                        );
-                    }
-                }
+    /**
+     * @param Item $cartItem
+     * @return void
+     * @throws GraphQlInputException
+     */
+    private function validateCartItem(Item $cartItem): void
+    {
+        if ($cartItem->getHasError()) {
+            $errors = [];
+            foreach ($cartItem->getMessage(false) as $message) {
+                $errors[] = $message;
+            }
 
-                $this->cartItemRepository->save($cartItem);
+            if (!empty($errors)) {
+                throw new GraphQlInputException(
+                    __(
+                        'Could not update the product with SKU %sku: %message',
+                        ['sku' => $cartItem->getSku(), 'message' => __(implode("\n", $errors))]
+                    )
+                );
             }
         }
     }