Re: (no subject)
Re: (no subject)
- Subject: Re: (no subject)
- From: John Timmer <email@hidden>
- Date: Thu, 02 Jun 2005 18:35:00 -0400
Title: Re: (no subject)
I bound it to the Person Array Controller, using a Controller Key of selection, and a model key of addresses.@count. I was thinking that this should take the currently selected Person, get their addresses & display a count of how many there were. When I start adding addresses, I get an exception:
[<NSManagedObject 0x3a5380> addObserver:<NSArrayController 0x570d500> forKeyPath:@"addresses.@count" options:0x0 context:0x0] was sent to an object that is not KVC-compliant for the "addresses" property.]
In looking thru the docs, it appears that relationship properties would naturally return an NSSet. I tried varying the binding to use addresses.count (count being a valid method name in NSSet), but still no joy. Is it possible to do what I want with the basic NSManagedObject instead of subclassing to create an addressCount method?
Unfortunately, as your error noted, the count property is not key/value coding compliant, since you can’t set the count, only read it. As such, you can’t bind an editable value to the count of a set or array. I know that for basic text fields, binding to a displayPattern with keys like @count works nicely. Whether it would work for the value of the text field, I’m not sure. I also haven’t tried setting a table column as non-editable and checked if bindings work in that context.
JT
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| | >(no subject) (From: Niels Meersschaert <email@hidden>) |