First: Quincey, Dado, Chase, WT, thanks for your comments, much appreciated!
On Apr 7, 2011, at 6:53 PM, Quincey Morris wrote:
> On Apr 7, 2011, at 03:06, Ray wrote:
>
>> Right, I tried something like this earlier, but when I use
>>
>> - (NSString*) localizedName {
>> return NSLocalizedString (self.name, nil);
>> }
>>
>> I get an exception:
>>
>> Terminating app due to uncaught exception 'NSInvalidArgumentException',
>> reason: 'keypath localizedName not found in entity <NSSQLEntity TestEntity
>> id=1>'...
>
> I don't see anything in the documentation for the fetch sort descriptors that
> says they have to specify a Core Data property, rather than a custom or
> derived property, although perhaps that is the problem. You didn't use this
> key somewhere else, like in the fetch predicate, by any chance?
Dado wrote:
> "The SQL store, on the other hand, compiles the predicate and sort
> descriptors to SQL and evaluates the result in the database itself. This is
> done primarily for performance, but it means that evaluation happens in a
> non-Cocoa environment, and so sort descriptors (or predicates) that rely on
> Cocoa cannot work." [1]
>
> [1]
> http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdPersistentStores.html
I think this nails down the problem. I will have to rethink my approach. I was
hoping to be able to resort to other solutions than what one would do with
"databases" normally, examples here:
<http://stackoverflow.com/questions/5534681/how-to-represent-a-localized-string-type-in-core-data>
<http://stackoverflow.com/questions/2689570/good-practices-for-multiple-language-data-in-core-data>
(I just glanced through them briefly, btw.)
Anyway, I will post my solution, if any ;)
Thanks again,
- Ray.
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