Am 12.03.2010 um 04:34 schrieb Eli Bach:
> 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:
How about Owner.instanceOfA.relationB.relationC ?
If you ask an array for a key path you get a new array containing the resulting
objects.
You don’t need any operators.
atze
>
> ie:
>
> bind content set to
>
> File Owner.instanceOfA.?
>
> Thanks,
>
> Eli
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