KVC & subcriptable objects Re: [Pyobjc-dev] NSUserDefaultsController

[b.bum <bb...@ma...>]

On Apr 12, 2004, at 4:21 PM, Paul Donovan wrote:
> <_NSControllerObjectProxy: 0x1123830>
> 2004-04-13 00:12:22.453 Test[19056] An exception has occured:
> Traceback (most recent call last):
>   File  
> "/Users/pauld/Projects/Test/build/Test.app/Contents/Resources/ 
> __main__.py", line 18, in ?
>     AppHelper.runEventLoop(argv=[])
>   File  
> "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
> python2.3/site-packages/PyObjC/PyObjCTools/AppHelper.py", line 71, in  
> runEventLoop
>     NSApplicationMain(argv)
>   File  
> "/Users/pauld/Projects/Test/build/Test.app/Contents/Resources/ 
> RatingsModel.py", line 46, in awakeFromNib
>     self.makeLibrary(file)
>   File  
> "/Users/pauld/Projects/Test/build/Test.app/Contents/Resources/ 
> RatingsModel.py", line 29, in makeLibrary
>     print prefs['FontName']
> TypeError: unsubscriptable object
>
> I'm not sure why the type of 'prefs' is an NSControllerObjectProxy. I  
> was expecting it to be an NSDictionary* (and hence a python  
> dictionary). I have an instance of an NSUserDefaultsController in my  
> nib file, so I'm a bit stuck at this point.

It is an NSCOP because it is not a static dictionary of values.  It is  
literally a proxy to the NSUserDefaultsController.

This raises a slightly different issue -- one that we have sort of  
punted on for a while.

Since KVC -- key/value coding -- is implemented on NSObject [both  
-valueForKey: and -setValue:forKey:] is there any reason to not support  
subscript style access to all Obj-C objects passed to the python side  
of the bridge?

It is a trivial change to make it so, I believe.

b.bum