[2.4.5-p3] [GraphQL] Applied discounts not returned for virtual carts

[DuckThom]

Preconditions and environment

• Magento version 2.4.5-p3
• Cart consists only of virtual products (is_virtual is true)
• Cart has coupon code applied

Steps to reproduce

1. Create an empty cart
2. Add virtual product to the cart
3. Apply coupon code to cart
4. Retrieve the cart with the applied discounts

query cart($cartId: String!) {
    cart(cart_id: $cartId) {
        is_virtual
        prices {
            discounts {
                amount {
                    value
                    currency
                }
                label
            }
        }
        applied_coupons {
            code
        }
    }
}

Expected result

Coupon is applied to the cart and the applied discount is visible in the cart.prices.discounts array.

{
  is_virtual: true,
  prices: {
    discounts: [
      { amount: { value: 159.8, currency: 'EUR' }, label: '20% Discount' }
    ]
  },
  applied_coupons: [ { code: 'TEST-123' } ]
}

Actual result

Coupon code is applied and the discount is subtracted from the order total, however, the cart.prices.discounts field is null

{
  is_virtual: true,
  prices: {
    discounts: null
  },
  applied_coupons: [ { code: 'TEST-123' } ]
}

Additional information

magento2/app/code/Magento/QuoteGraphQl/Model/Resolver/Discounts.php

Line 45 in ca30c47

$address = $quote->getShippingAddress();

The Discounts resolver attempts to read the discounts from the cart shipping address. Since it's a virtual cart, there is no shipping address and therefor no discounts will be returned.

Potential fix
Changing the line to $address = $quote->getBillingAddress(); will return the discounts as expected. But I am not sure if this will be 100% reliable.

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[engcom-Bravo]

@magento give me 2.4-develop instance

[magento-deployment-service]

Hi @engcom-Bravo. Thank you for your request. I'm working on Magento instance for you.

[magento-deployment-service]

Hi @engcom-Bravo, here is your Magento Instance: https://7108b5f85a79b56ea3e7305a62bfbf5f.instances-prod.magento-community.engineering
Admin access: https://7108b5f85a79b56ea3e7305a62bfbf5f.instances-prod.magento-community.engineering/admin_2634
Login: 7e2978d8
Password: 17963ab68801

[engcom-Bravo]

Hi @DuckThom,

Thank you for reporting and collaboration.

Verified the issue on Magento 2.4-develop instance and the issue is not reproducible.Kindly refer the screenshots.

Steps to reproduce

• Create an empty cart
• Add virtual product to the cart
• Retrieve the cart with the applied discounts

query cart($cartId: String!) {
    cart(cart_id: $cartId) {
        is_virtual
        prices {
            discounts {
                amount {
                    value
                    currency
                }
                label
            }
        }
        applied_coupons {
            code
        }
    }
}

As per this document https://developer.adobe.com/commerce/webapi/graphql/schema/cart/queries/cart/#cartprices-object we will get the discounts under discounts object.Please refer the document and let us know if you are still facing any issue.

Thanks.

[DuckThom]

Hello @engcom-Bravo

I am able to reproduce this on the 2.4-develop branch.

I've created a clean Magento 2 installation, with 1 virtual product and 1 cart price rule (20% discount) with a coupon code "TEST-123"

After which I've executed the following GraphQL mutations:

1. Create an empty cart:

2. Added the product to the cart

3. Applied the coupon code

As you can see in the final screenshot, the coupon code is applied, but the cart.prices.discounts field is empty

[DuckThom]

Additionally, here is a screenshot of the cart query of the current situation:

As you can see, the 20% discount itself is applied (grand total is 10 EUR lower than the subtotal). But there is no active discount listed in the response.

Here is a screenshot of the response (query is the same as above) where I applied the potential fix I mentioned in my original comment:

Here, the applied discount amount of 20% / 10 EUR is correctly visible in the response.

[engcom-Bravo]

Hi @DuckThom,

Thanks for your quick response.

Verified the issue on Magento 2.4-develop instance and the issue is reproducible. Kindly refer the screenshots.

Steps to reproduce

• Create an empty cart
• Add virtual product to the cart
• Retrieve the cart with the applied discounts

query cart($cartId: String!) {
    cart(cart_id: $cartId) {
        is_virtual
        prices {
            discounts {
                amount {
                    value
                    currency
                }
                label
            }
        }
        applied_coupons {
            code
        }
    }
}

Coupon is getting applied but in the discounts field we are getting as NULL.

Hence Confirming this issue.

Thanks.