We need a new JSON API resource, allowing to update multiple order items at once (right now, we can only update one at the time).
The route should be /carts/{commerce_order}/items (method: PATCH).
The route should return the updated order, validate order items, allow quantity = 0.
If quantity = 0 is passed, the cart manager should remove the order item from the cart.
Having this endpoint would give us more flexibility and is certainly a performance improvement.
Note that the order item should be validated (I'm thinking about the "purchased_entity" and "quantity" fields).
Needs work
1.0
Code
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I know this is old, but was giving it a try and there's first of all no way to update attributes, and, the route declaration is wrong.
_jsonapi_resource should use the right resource :).
'_jsonapi_resource' => CartUpdateItemsResource::class,