I want to use a keypath that goes through an abstract entity down into
a concrete sub-entity. For example, given this data model:
Abstract entity: person
Concrete sub-entities: man, woman
Abstract entity: club
relationship: members (->> person)
Concrete sub-entities: allMale, coed
I want to specify a fetch request like so:
Entity: "allMale"
Predicate: "ALL members.beard > 0"
Since beard is not an attribute of the abstract person entity that
members points to, I get the following error at runtime:
NSInvalidArgumentException -- keypath members.beard not found in
entity <NSSQLEntity allMale id=8>
Other than redesigning the data model, is there a way to specify the
concrete entities that Core Data should use at each point in the
keypath? I.e. something like "ALL members.(man)beard > 0"?
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