On 2010 Jul 01, at 15:38, I wrote: > I'm debugging a problem with Save As in a Core Data document...
Yeah, I know, that original post was a long shot. I fixed the problem but still don't understand it. The "Save As" operation I was debugging is actually a home-made one which also deletes the original. I had implemented this by sending -[NSPersistentDocument writeSafelyToURL:ofType:forSaveOperation:error:], and manually moving the files and setFileURL: in code. Upon waking from a nap, I replaced this message with -[NSManagedObjectContext save:], and the problem went away. Actually, there was another problem I didn't mention in my first post, and that problem went away too. The second problem was that, during the save, Core Data would register a single Undo invocation which had a nil target, with selector _noop: and argument of type __NSArray0*, which had a -count = 0. (Thanks to Graham Cox' GCUndoManager for that peek!) Obviously this action was a no-op, but it dirtied my red button, etc. In NSPersistentDocument documentation, the only one of the save/write methods overridden from NSDocument is supposedly writeToURL:ofType:forSaveOperation:originalContentsURL:error:, which is the next lower-level method invoked by writeSafelyToURL:ofType:forSaveOperation:error:. So I don't see what the problem was. Anyhow, since I'm taking care of the high-level file management stuff as explained above, I'm satisfied that -[NSManagedObjectContext save:] should be sufficient, and it seems to work. "Message Flow In the Document Architecture" [1] is possibly the single most useful "Programming Guide" page on developer.apple.com, but it doesn't cover the little variations for Core Data. I just submitted Document Feedback suggesting that they do so. Jerry [1] http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Documents/Articles/ObjectInteractions.html _______________________________________________ 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
