Cart transform - multiple merge operations with same parent variant

[SaeedGHF]

Describe the bug

We have a problem when multiple numbers of the same bundle exist in the cart.

After navigating to checkout, the price update modal is displayed and child components are added back to the cart.

Example function output:
{ "operations": [ { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/9dff30c8-b084-4e53-ab6c-38b1d0ee5d0a", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/96dbc3d2-73b6-4544-bf27-3c434f74d43f", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "Bundle 34" } }, { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/9dff30c8-b084-4e53-ab6c-38b1d0ee5d0a", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/96dbc3d2-73b6-4544-bf27-3c434f74d43f", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "Bundle 34" } } ] }

The problem also exists when we assign different titles to operations.

Example function output:
{ "operations": [ { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/075d4d14-4bf2-4389-b4e4-f7886cd7bb2e", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/2a56590c-acd7-4595-adfe-a80b11994646", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "1" } }, { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/075d4d14-4bf2-4389-b4e4-f7886cd7bb2e", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/2a56590c-acd7-4595-adfe-a80b11994646", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "2" } }, { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/075d4d14-4bf2-4389-b4e4-f7886cd7bb2e", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/2a56590c-acd7-4595-adfe-a80b11994646", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "3" } }, { "merge": { "cartLines": [ { "cartLineId": "gid://shopify/CartLine/075d4d14-4bf2-4389-b4e4-f7886cd7bb2e", "quantity": 1 }, { "cartLineId": "gid://shopify/CartLine/2a56590c-acd7-4595-adfe-a80b11994646", "quantity": 1 } ], "parentVariantId": "gid://shopify/ProductVariant/47599165669668", "price": { "percentageDecrease": { "value": 25 } }, "image": null, "title": "4" } } ] }

Expected behavior

We needed to add multiple bundles to the cart that would work properly at checkout.

Additional context

We are only using merge functionality and have not implemented expand operations.
Everything works fine if there is only one bundle on the cart.

[ashfaqhaq]

hey facing the same issues, were u able to find some resolution?

[abhisheksingh75]

+1

[mahdi-akbary]

As it's clearly mentioned here in Docs, only one merge operation will be applied and the reset with the same cartline ids will be discarded.
So I think this issue is closed!

[nishikawa-nobuyuki]

As it's clearly mentioned here in Docs, only one merge operation will be applied and the reset with the same cartline ids will be discarded.
So I think this issue is closed!

For example, the following code from the documentation

{ "operations": [ "expand": { "cartLineId": "gid://shopify/CartLine/1", "title": "Awesome TV with Warranty", "image": null, "expandedCartItems": [ { "merchandiseId": "gid://shopify/ProductVariant/1", "quantity": 1, "price": { "adjustment": { "fixedPricePerUnit": { "amount": "1000.00" } } } }, { "merchandiseId": "gid://shopify/ProductVariant/2", "quantity": 1, "price": { "adjustment": { "fixedPricePerUnit": { "amount": "150.00" } } } } } } ] }

In the above example, if a customer adds three items to the cart, "gid://shopify/ProductVariant/1" and "gid://shopify/ProductVariant/2", only one "Awesome TV with Warranty" is added to the cart. and "gid://shopify/ProductVariant/1" and "gid://shopify/ProductVariant/2" are purchased separately, two at a time.

In such a case, the correct behavior would seem to be to purchase three "Awesome TV with Warranty", but this is not possible with the current "Cart transform" API specification.

Is there any way to do this here?