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Re: Bug in NSArrayController? (immutable instead of mutable dictionaries)

Am 22.10.2004 um 03:28 schrieb M. Uli Kusterer:

At 2:59 Uhr +0200 22.10.2004, Uli Zappe wrote:
4. The above only happens as long as appliesImmediately is set to YES in NSUserDefaultsController. If it is set to NO, NSUserDefaultsController always returns mutable dictionaries. However, this is no workaround for the creation of new mutable dictionaries, because as soon as as appliesImmediately is set back to YES to enable saving the preference settings to disk, NSUserDefaultsController sends an *immutable* dictionary to NSArrayController, thus changing the mutable to an immutable dictionary.

I'll file a bug report.

You'll very likely get back "behaves as designed".

Well, it doesn't in that NSUserDefaultsController does *not* always return immutable objects; in fact, most of the time it does return mutable objects. It's only that you can't create them in the first place. Once you have dealt with that (e.g. restarted your app with a now existing preferences plist), it works.

So the most important point IMHO is consistency of behavior. If it consistently returns immutable objects, I won't like it, but at least it would be consistent.

Apart from that, wanting to store sets of preferences in an array and in the user defaults system at the same time is such an obvious application for Bindings that it should be possible to do this without all this hassle. If Apple really decides to make immutable the consistent behavior, then at least they should provide a factory NSImmutableToMutableTransformer.

Bye
Uli
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Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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References: 
 >Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: Uli Zappe <email@hidden>)
 >Re: Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: Brent Gulanowski <email@hidden>)
 >Re: Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: Uli Zappe <email@hidden>)
 >Re: Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: Uli Zappe <email@hidden>)
 >Re: Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: Uli Zappe <email@hidden>)
 >Re: Bug in NSArrayController? (immutable instead of mutable dictionaries) (From: "M. Uli Kusterer" <email@hidden>)



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