On Thu, Jan 17, 2013, at 12:31 AM, Laurent Daudelin wrote: > Any reason why comparator blocks are not supported in NSSortDescriptor > when used for an NSFetchRequest? I tried one unaware they were not > supported and I got an exception: > > *** Terminating app due to uncaught exception > 'NSInvalidArgumentException', reason: 'unsupported NSSortDescriptor > (comparator blocks are not supported)'
Guessing you're using a SQLite store? The SQLite store converts fetch requests into SQL queries, and there's no way to express a block comparator as a SQL query. See the section Fetch Predicates and Sort Descriptors of the Persistent Store Features chapter of the Core Data Programming Guide: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdPersistentStores.html --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
