Core Data: Predicate for first element in orderd relationship

Question

I have this to-many relationship which contains at least one element:

Appointment <<------>> Invitee

appointment.invitee

Answer 1

Clearly, this a question that not even the most expert Core Data savants can answer.

The workaround is to model the first element as a separate to-one relationship and the rest as an optional to-many relationship based on the same related entity.

Appointment <<------>  mainInvitee        (Invitee)
            <<------>> additionalInvitees (Invitee)