Re: KVC

[Helge Hess]

On May 29, 2007, at 11:17, Richard Frith-Macdonald wrote:
> Hi Helge, It's not clear to me what the problem is with - 
> setNilValueForKey:
>
> The Apple documentation at http://developer.apple.com/documentation/ 
> Cocoa/Reference/Foundation/Protocols/NSKeyValueCoding_Protocol/ 
> Reference/Reference.html#//apple_ref/occ/instm/NSObject/ 
> setNilValueForKey:
> says that 'The default implementation raises an  
> NSInvalidArgumentException'
>
> Are you saying that the Apple implementation does not do what the  
> documentation says?

Well, I don't have the time to properly reproduce the exact issues,  
but I think Cocoa has a Compatibility mode for classes which do  
implement -takeValue:forKey:.
Which also involves (overrides) -setNilValueForKey:.

I assume the documentation is correct if you use new-style KVC, but  
for old-style code (probably the far majority of existing code!) an  
possibly undocumented Compat mode kicks in.

Greets,
  Helge

PS: of course we should also update OGo to implement the new API, but  
thats quite a few places to fix.
--
Helge Hess
http://www.helgehess.eu/