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Using @count set operator with CoreData relationships raises exception?

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Using @count set operator with CoreData relationships raises exception?

Subject: Using @count set operator with CoreData relationships raises exception?
From: Jim Correia <email@hidden>
Date: Tue, 26 Jul 2005 12:25:27 -0400

Am I missing something obvious here? In the CoreRecipes sample, I've bound a text field's display pattern value to the source tree controller, selection - items.@count.

At runtime I get this error:

2005-07-26 12:21:25.245 CoreRecipes[28655] [<NSCFSet 0x5d034f0> addObserver:forKeyPath:options:context:] is not supported. Key path: @count

(In my own app, I get the same error but it is a faulting set raising the exception.)

What have I done wrong? Can I do this "purely" with bindings and operators, or must I bind to a summaryString property which is generated by code?

Thanks,
Jim
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