This is just a shot in the dark and I am not sure how feasible it is,
but, could you have put a property on your entity that is
non-transient and represents the current localized representation of
the string. This way you could do something like this when fetching
your values:
if (storedLanguage != currentLanguage) {
[self translateStoredNamesToNewLanguage];
storedLanguage = currentLanguage;
}
// fetch strings
NSSortDescriptor *sortDescriptor =
[[NSSortDescriptor alloc] initWithKey:"translatedRepresentationOfName"
ascending:YES
selector:@selector(localizedCaseInsensitiveCompare:)];
// …
You would then have a function
-- (void)translateStoredNamesToNewLanguage
{
for ( /* all names in core data database */ ) {
entity.translatedRepresentationOfName =
NSLocalizedString(entity.name, nil)
}
// Save your manage object
}
Assuming that your users won't be changing their language that often
the overhead in translating the names would be very limited. Also, I
don't actually know if you can register to receive notifications when
the user changes their language preference, so if you can't, I don't
think this approach would work, but if you can it might be worth a
shot.
Chase
On Thu, Apr 7, 2011 at 10:41 AM, Quincey Morris
<quinceymor...@earthlink.net> wrote:
> On Apr 7, 2011, at 10:30, Dado Colussi 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
>
> Ah, thanks for finding it. It's some distance away from the place I was
> looking. Also, later in the same paragraph:
>
>> In addition you cannot sort on transient properties using the SQLite store.
>
> which nixes the other idea too.
>
>
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