Re: Using @count set operator with CoreData relationships raises exception?
Re: Using @count set operator with CoreData relationships raises exception?
- Subject: Re: Using @count set operator with CoreData relationships raises exception?
- From: "Marcus S. Zarra" <email@hidden>
- Date: Tue, 26 Jul 2005 11:23:04 -0600
I have run into this same issue trying to bind directly in IB. To work
around it I created a method in the object that did a [self
valueFromKeyPath:] and returned the results.
I had assumed it was something I was doing wrong and did not have the time
at that point to investigate it further.
On 7/26/05, Jim Correia <email@hidden> wrote:
>
> 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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