Someone kindly warned me off-list about taking care when an item is deleted and then re-added by an Undo. It turns out my "solution" was not complete (nor correct - see below).
When a user undoes a deletion it calls the primitive accessor which does not emit KVC/KVO notifications. I get the feeling that the obvious workaround of manipulating observers in the primitive accessors is a bad idea and is likely to just open another can of worms. I also get the feeling that this issue is similar to other people's previously discussed issues and that I'm going to need to take over the undo/redo responsibilities from the NSArrayController (as mentioned in this post: http://cocoaconvert.net/2009/05/07/core-data-rough-riding/). Which leaves me with two questions I can't yet answer and would greatly appreciate some assistance with: 1) Is my gut feeling about not using primitive accessors to manage observers correct? 2) Is there a simple way to override that small aspect of the undo/redo system (as I'm lazy and everything else is working well) or do I need to implement undo/redo myself? For any one else reading this that is struggling to do something similar the reason my previous solution was less than correct (on top of being incomplete) is that I added a declaration of the related object (Account *account;) to use for the relationship and modified that directly in the KVC compliant method (- (void)setAccount:(Account *)newAccount) when I should have been calling the auto generated primitive methods to do that. See http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdAccessorMethods.html for more info. I'm beginning to think Aaron Hillegass was wrong (not about some things being hard, just about me not being stupid! :)) _______________________________________________ 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
