On 11/17/09 9:02 PM, David Catmull said: >I have an entity with a "date" property, and derived properties "year" >and "month" (by having year/month methods in my NSManagedObject >subclass). In a couple of different places, I fetch the entries from a >particular year or month- the fetch requests's predicate says "year == 2009". > >This works fine except in a document that has been saved and reopened: >the first time I make a change to an object, and then try to fetch a >list of objects by year, an exception is thrown saying "keypath year not >found". What confuses me is that between reopening the document, and >making a change, I can make (as far as I can tell) the same request to >filter by year (or month) without problems. It doesn't matter which >property I change - date or anything else. > >So I have two questions: >1. Why would this happen? >2. What's a good, simple way to write a unit test that simulates closing >an reopening a Core Data document? I want to avoid actual file >operations for the sake of simplicity, but NSPersistentDocument does not >implement the dataOfType:error: method.
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. -- ____________________________________________________________ Sean McBride, B. Eng s...@rogue-research.com Rogue Research www.rogue-research.com Mac Software Developer Montréal, Québec, Canada _______________________________________________ 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
