On Nov 18, 2009, at 2:13 PM, Sean McBride wrote: > What do you mean exactly by "derived properties"? Are they transient? > Are they in your xcdatamodel? In any case, I believe your problem is > that you can only fetch against properties that are in the persistent > store ie in your xcdatamodel and not transient.
I subclassed NSManagedObject and just added year and month methods. What confuses me is the sequence of events that leads to the failure - it works after reopening the document, *until* I make a change. In any case, I've gotten around this by dropping the derived property approach and using predicates that access the original date property directly. -- David Catmull uncom...@uncommonplace.com http://www.uncommonplace.com/ _______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
