Cart Transform API Merge Operation -- Adding new attributes to cartLines during MergeOperation?

[grizzlypoppy]

Hey guys, I have a quick question on this note in the changelog:

 
I can successfully pass in new attributes to the merged bundle, but how can I target individual components within the bundle for new line item attributes?

Say I want to add some new properties to one of the existing child components? Is it possible? cartLines seems to not accept attributes, as she just wants `id` and `quantity`

Is there any way to preserve existing line item attributes and also add some custom ones to children during the merge operation?

      operations.push({
        merge: {
          parentVariantId: parentLine.merchandise.id,
          cartLines: [
            {
              cartLineId: parentLine.id,
              quantity: parentLine.quantity,
            },
            ...relatedChildLines.map((childLine) => ({
              cartLineId: childLine.id,
              quantity: childLine.quantity,
            })),
          ],
          attributes: [{
            key: "newAttribute",
            value: "newValue!",
          }]
        }
      });

 

[Liam]

Hi Grizzlypoppy,

I've connected with the product team on this, and they've advised that you can set attributes on ExpandedItem.

Hope this helps!

[grizzlypoppy]

Is this available on MergeOperation? Or do we have to use Expand?

[grizzlypoppy]

Thanks again @Liam for your response. Since this is a Merge Operation -- do you happen to know if `ExpandedItem` will still be accessible in the MergeOperation? 

Any insight here appreciated!! TIA