Resolves #2382
Impact: minor
Type: feature

Changes

A new cancelOrderItem mutation allows you to cancel a single order item or a partial quantity of a single order item.

The operator UI does not yet use this. That will be done in a separate PR, at which time the cancelOrder Meteor method will also be removed.

• cancelOrderItem can be called internally to synchronize from an external system by setting context.isInternalCall to true
• cancelOrderItem can be called through GraphQL by any user with "orders" permission for the shop that owns the order
• cancelOrderItem can be called through GraphQL by the user who placed the order. In this case, the cancellation will only succeed if both the item status and the order status are "new".
• Unlike with the existing Meteor method, neither restocking nor refunds are handled by this mutation. These are separate things with separate systems, so we'll now expect clients to separately ask for restocking or refunds as necessary.
• When the last item in a group is canceled, the group is also canceled. When the last group in an order is canceled, the order is also canceled.

Breaking changes

None

Testing

1. Place an order.
2. Verify that the mutation works as described.
3. Verify that you can cancel an order item when authenticated as a user with "orders" role or as the user who placed the order, but not when authenticated as someone else or when not authenticated.