The plan for the addressbook to have a list (that is probably displayed as a grid), containing contacts, addressbooks and contact groups. Clicking an addressbook would just narrow down the search (act as a filter).

Implementation wise that means we have to get addressbooks and contacts into the same model, which is currently not easily possible.
We have to options:

• Create a model that can combine to sub-models
• Support querying for multiple types in Sink.

If we really need to support it, it probably makes sense to push the functionality into Sink rather than adding more complexity in Kube.