The operators mentioned on this page, particularly "@unionOfSets".

<http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/KeyValueCoding/Concepts/ArrayOperators.html>

I have the following Core Data object's setup

ClassA          ClassB          ClassC
relationA  -->  relationB --> relation C

where each of the relations is a many to one [one class A, many class B, and 
one class B, many class C].
Not all ClassB's will have ClassC objects attached to them

I have an instance of classA, and I want an NSArrayController with all the 
ClassC objects for all the ClassB objects that are related to that specific 
instance of ClassA, preferably in a way that uses KVO instead of 
programmatically updating with fetches/predicates/etc.

What would be the right way to bind the NSArrayController, assuming the nib 
owner has an instance of classA:

ie:

bind content set to

File Owner.instanceOfA.?

Thanks,

Eli

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