MDVA-37234: Adding item to cart multiple times creates duplicate line item

The MDVA-37234 patch fixes the issue where adding an item to the cart multiple times (parallel request) for the same SKU creates a duplicate line item for the same cart ID. This patch is available when the Quality Patches Tool (QPT) 1.1.3 is installed. The patch ID is MDVA-37234. Please note that the issue is scheduled to be fixed in Adobe Commerce 2.4.4.

Affected products and versions

The patch is created for Adobe Commerce version:

Adobe Commerce (all deployment methods) 2.3.6, 2.4.1, and 2.4.2

Compatible with Adobe Commerce versions:

Adobe Commerce (all deployment methods) 2.3.5 - 2.3.7-p1 and 2.4.1 - 2.4.2-p1

Issue

Adding an item to the cart multiple times (parallel request) for the same SKU creates a duplicate line item for the same cart ID.

Steps to reproduce:

1. Create a simple product with SKU = simple1.

2. Create a customer.

3. Generate a customer token for making GraphQL request.

    
    mutation {
        generateCustomerToken(
            email: "customer email"
            password: "customer password"
        )
        {
            token
        }
    }
    
    

4. Use the token mentioned in step 3 to create an empty cart for the customer.

    
    mutation{
     createEmptyCart
    }
    
    

5. Create a script to make two addSimpleProductsToCart requests running in parallel. For example:

    
    curl -X POST -H "Content-Type: application/json" -H "Authorization: Bearer eyJraWQiOiIxIiwiYWxnIjoiSFMyNTYifQ.eyJ1aWQiOjEsInV0eXBpZCI6MywiaWF0IjoxNjIzOTUyNjcwLCJleHAiOjE2MjM5NTYyNzB9.-fh7ysqiQTAacdB3MVvaXzFE9AmKyfF8TsVmICLJoWI" -d '{"query" : "mutation { addSimpleProductsToCart( input: { cart_id: \"S8dCF7uan1POMy0qY0Hup7tEv1AhFGdY\" cart_items: [ { data: { quantity: 2 sku: \"simple1\" } } ] } ) { cart { items { id product { name sku } quantity } } } }"}' http://magento2.3.local/graphql &
    curl -X POST -H "Content-Type: application/json" -H "Authorization: Bearer eyJraWQiOiIxIiwiYWxnIjoiSFMyNTYifQ.eyJ1aWQiOjEsInV0eXBpZCI6MywiaWF0IjoxNjIzOTUyNjcwLCJleHAiOjE2MjM5NTYyNzB9.-fh7ysqiQTAacdB3MVvaXzFE9AmKyfF8TsVmICLJoWI" -d '{"query" : "mutation { addSimpleProductsToCart( input: { cart_id: \"S8dCF7uan1POMy0qY0Hup7tEv1AhFGdY\" cart_items: [ { data: { quantity: 1 sku: \"simple1\" } } ] } ) { cart { items { id product { name sku } quantity } } } }"}' http://magento2.3.local/graphql
    
    

6. Run the script.

Expected results:

Only one product line with a total quantity (three in this case) is created in the Shopping Cart.

Actual results:

Two separate lines for the same product are created in the Shopping Cart.

Apply the patch

To apply individual patches, use the following links depending on your deployment type:

• Adobe Commerce or Magento Open Source on-premises: Software Update Guide > Apply Patches in our developer documentation.
• Adobe Commerce on cloud infrastructure: Upgrades and Patches > Apply Patches in our developer documentation.

Related reading

To learn more about quality patches for Adobe Commerce, refer to:

• Quality Patches Tool released: a new tool to self-serve quality patches.
• Check if patch is available for your Adobe Commerce issue using Quality Patches Tool.

For info about other patches available in QPT, refer to the Patches available in QPT section.