[GraphQl] Cart error messages are faulty

[Hexmage]

Preconditions (*)

1. Magento 2.4.2+

Steps to reproduce (*)

1. Create a cart
2. Add 2 products to the cart with at least 4 quantities each.
3. Set the quantity of added products below the quantity in the cart.
4. Retrieve cart through graphql

{
  cart(cart_id: "RQg4YPcQX1htp47j6GMpTKRshfY6SVm6") {
    items {
      id
      product {
        name
        sku
        stock_status
      }
      quantity
    }
  }
}

Expected result (*)

1. A error message which tells me which item in the cart causes the error. So that we can give correct feedback to the Customer.
2. A cart with valid values for items.
3. An error message for each issue with the cart.

Actual result (*)

{
  "errors": [
    {
      "message": "The requested qty is not available",
      "extensions": {
        "category": "graphql-input"
      },
      "locations": [
        {
          "line": 7,
          "column": 5
        }
      ],
      "path": [
        "cart",
        "items",
        0
      ]
    }
  ],
  "data": {
    "cart": {
      "items": [
        null,
        {
          "id": "32",
          "product": {
            "name": "Strive Shoulder Pack",
            "sku": "24-MB04",
            "stock_status": "IN_STOCK"
          },
          "quantity": 3
        },
        {
          "id": "33",
          "product": {
            "name": "Joust Duffle Bag",
            "sku": "24-MB01",
            "stock_status": "IN_STOCK"
          },
          "quantity": 4
        }
      ]
    }
  }
}

2. In the items node there is a null entry, this only shows up when there is an error. In default Venia this breaks the cart page.
3. I assume the path node in the error node should reference the item it's affecting. It currently points to the above null value.
4. Only the first error of the cart shows up.

---

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[engcom-Hotel]

Hello @Hexmage,

Thanks for posting the issue!

I would like to suggest you add stock_status, so that it will give the exact situation of stock.

for eg:
The below query:

{
  cart(cart_id: "5VrDt8LhknXPP3ugJuXZZerItlVDrtB0") {
    items {
      id
      product {
        name
        sku
        stock_status
      }
      quantity
    }
  }
}

Will return:

{
  "errors": [
    {
      "message": "Some of the products are out of stock.",
      "extensions": {
        "category": "graphql-input"
      },
      "locations": [
        {
          "line": 7,
          "column": 5
        }
      ],
      "path": [
        "cart",
        "items",
        0
      ]
    }
  ],
  "data": {
    "cart": {
      "items": [
        null,
        {
          "id": "12",
          "product": {
            "name": "Joust Duffle Bag",
            "sku": "24-MB01",
            "stock_status": "OUT_OF_STOCK"
          },
          "quantity": 1
        },
        {
          "id": "13",
          "product": {
            "name": "Strive Shoulder Pack",
            "sku": "24-MB04",
            "stock_status": "IN_STOCK"
          },
          "quantity": 1
        }
      ]
    }
  }
}

You can see stock_status as OUT_OF_STOCK where the product is out of stock.

Thanks

[Hexmage]

@engcom-Hotel
But what if the stock of a product changes from 3 to 2 and I had 3 in my cart. stock_status won't help me identify what the problem is in that scenario.

It's nice that there are error messages in the cart response, but they need a second pass over. Because as they are now they aren't good enough.

[engcom-Hotel]

Hello @Hexmage,

Thanks for the reply!

This is the valid point, if the cart item is less in stock then proper handling is required. I have followed the below steps to reproduce the issue:

• Add 2 items in the cart with 4 quantities each
• Set the quantity of a product to 2 in the admin panel, it should be in the customer cart.
• Run the cart query:

{
  cart(cart_id: "RQg4YPcQX1htp47j6GMpTKRshfY6SVm6") {
    items {
      id
      product {
        name
        sku
        stock_status
      }
      quantity
    }
  }
}

• The response for the same is as follows:

{
  "errors": [
    {
      "message": "The requested qty is not available",
      "extensions": {
        "category": "graphql-input"
      },
      "locations": [
        {
          "line": 7,
          "column": 5
        }
      ],
      "path": [
        "cart",
        "items",
        0
      ]
    }
  ],
  "data": {
    "cart": {
      "items": [
        null,
        {
          "id": "32",
          "product": {
            "name": "Strive Shoulder Pack",
            "sku": "24-MB04",
            "stock_status": "IN_STOCK"
          },
          "quantity": 3
        },
        {
          "id": "33",
          "product": {
            "name": "Joust Duffle Bag",
            "sku": "24-MB01",
            "stock_status": "IN_STOCK"
          },
          "quantity": 4
        }
      ]
    }
  }
}

It should display which item has not enough quantity.

Updating the main description as well.

Thanks

[github-jira-sync-bot]

Unfortunately, not enough information was provided to create a Jira ticket. Please make sure you added the following label(s): Reproduced on 2.4.x, ^Area:.*

Once all required labels are present, please add Issue: Confirmed label again.

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-1965 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Hotel. Thank you for verifying the issue.
Issue Available: @engcom-Hotel, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[Hexmage]

@Usik2203 I'd rather have something that has to be unique to identify the product, because the product name can be identical for products. Also your solution doesn't solve the null object that suddenly got added to the items array.

[alitopaloglu]

Any update about null value? I can still reproduce this on 2.4.3-p2

[Hexmage]

@alitopaloglu
I've learned that the null value is the actual exception object. Which is handled by the resolver to make the error node in the response. But this node is never deleted after its handled. I'm currently testing some code on my own environment where I moved the Exception Object to a new node in the item that created it. But this will not work with default Venia.

[PauloPhagula]

Hi @Hexmage did you make any progress on this? I'm desperately looking for a solution.

[Hexmage]

@PauloPhagula
Think they fixed it in https://github.com/magento/magento2-pwa which is a repo with pwa specific fixes because the normal magento repo doesn't update fast enough.

[marwan-corals]

Hello,
Any Update on this error, its been setting here for months @m2-assistant

[marwan-corals]

@Hexmage I just checked and magento2-pwa didnt fix the issue either

[Hexmage]

@marwan-corals
They sort of did. They added a new graphql endpoint for just errors. While this doesn't fix the fact that there is an empty error object in the cart, it does allow you to easier find out which errors are in the cart.

Personally I used a plugin on the function to add an error string element to each order_item with the raw exception message in there instead of the empty node.

[marwan-corals]

@Hexmage, thanks for the reply, but if the item is shown as null, how is this handled?
also can you please share with me this plugin

[marwan-corals]

@Hexmage are you willing to help here ?

[Hexmage]

@marwan-corals
The Plugin

/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Experius\CartFix\Plugin\Magento\QuoteGraphQl\Model\Resolver;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
use Magento\Framework\GraphQl\Query\Uid;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Quote\Model\Quote;
use Magento\Quote\Model\Quote\Item as QuoteItem;
use Magento\QuoteGraphQl\Model\Cart\GetCartProducts;

/**
 * @inheritdoc
 */
class CartItems
{
    /**
     * @var GetCartProducts
     */
    private $getCartProducts;

    /** @var Uid */
    private $uidEncoder;

    /**
     * @param GetCartProducts $getCartProducts
     * @param Uid $uidEncoder
     */
    public function __construct(
        GetCartProducts $getCartProducts,
        Uid $uidEncoder
    ) {
        $this->getCartProducts = $getCartProducts;
        $this->uidEncoder = $uidEncoder;
    }

    /**
     * @inheritdoc
     */
    public function afterResolve($subject, $result, Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
    {
        if (!isset($value['model'])) {
            throw new LocalizedException(__('"model" value should be specified'));
        }
        /** @var Quote $cart */
        $cart = $value['model'];

        $itemsData = [];
        $cartProductsData = $this->getCartProductsData($cart);
        $cartItems = $cart->getAllVisibleItems();
        /** @var QuoteItem $cartItem */
        foreach ($cartItems as $cartItem) {
            $productId = $cartItem->getProduct()->getId();
            if (!isset($cartProductsData[$productId])) {
                $itemsData[] = new GraphQlNoSuchEntityException(
                    __("The product that was requested doesn't exist. Verify the product and try again.")
                );
                continue;
            }
            $productData = $cartProductsData[$productId];
            $errorMessages = null;
            if ($cart->getData('has_error')) {
                foreach ($cartItem->getErrorInfos() as $error) {
                    $errorMessages[] = $error;
                }
            }

            $itemsData[] = [
                'id' => $cartItem->getItemId(),
                'uid' => $this->uidEncoder->encode((string) $cartItem->getItemId()),
                'quantity' => $cartItem->getQty(),
                'product' => $productData,
                'errors' =>  $errorMessages,
                'model' => $cartItem,
            ];
        }
        return $itemsData;
    }

    /**
     * Get product data for cart items
     *
     * @param Quote $cart
     * @return array
     */
    private function getCartProductsData(Quote $cart): array
    {
        $products = $this->getCartProducts->execute($cart);
        $productsData = [];
        foreach ($products as $product) {
            $productsData[$product->getId()] = $product->getData();
            $productsData[$product->getId()]['model'] = $product;
            $productsData[$product->getId()]['uid'] = $this->uidEncoder->encode((string) $product->getId());
        }

        return $productsData;
    }
}

The schema.graphqls additions

interface CartItemInterface {
    errors: [Error]
}

type Error {
    origin: String
    type: Int
    message: String
}

[alexmtch]

They removed the module : magento/magento2-pwa@96c5f5f

[Hexmage]

That explains a lot.

[marwan-corals]

Thanks, @Hexmage the provided code is helpful; one more note here is to add to di.xml

    <type name="Magento\QuoteGraphQl\Model\Resolver\CartItems">
        <plugin name="Magento_CartItems_Add_Source_Errors" type="PathTo\Your\Class\Resolver\CartItems" />
    </type>

[engcom-Lima]

Hi @Hexmage ,

Thanks for your contribution and collaboration.

I have tried to reproduce the issue in 2.4-develop but issue is not reproducible to me.

Followed below steps :

1. Create a cart
2. Add 2 products to the cart with at least 4 quantities each.
3. Set the quantity of added products below the quantity in the cart from admin.
4. Get cart details through graphql query:

query {
  
  customerCart {
    id
    items {
      uid
      product {
        name
        sku
      }
      quantity
    }
  }
}

After running above query I am not getting any error message "message": "The requested qty is not available", as you have reported.
Below is the screenshot for your reference:

If anything missing in above steps kindly provide the information.
Please note that I did PR changes but the response of step 4 was same.

Please test it in latest 2.4-develop if you are facing any issue kindly provide the information.

Thanks

[Hexmage]

@engcom-Lima
Feels like you don't have manage stock turned on. Because there should be an error message when the stock is below the available stock.

[engcom-Lima]

HI @Hexmage ,

I have tried to reproduce the issue in 2.4-develop and followed below steps but issue is not reproducible to me:

1. Create a cart
2. Add 2 products to the cart with at least 4 quantities each.
3. Set the quantity of added products below the quantity in the cart from admin.
4. Get cart details through graphql query:

query {
  
  customerCart {
    id
    items {
      uid
      product {
        name
        sku
      }
      quantity
    }
  }
}

5. Also Stores >> configuration >> Catalog >> inventory >>Product Stock Options >> Set Yes in Manage Stock.

Kindly provide me more information inorder to reproduce the isssue.
Also, please check in latest 2.4-develop and inform us whether issue is reproducible or not.

Thanks

[engcom-Lima]

Hi @Hexmage ,

Thank for your contribution and collaboration.

Please provide more information required to reproduce the issue.

Thanks