On 2010 Feb 02, at 11:54, Andreas Grauel wrote: > I have two Entities - Person and Event - both are with > a many to many relationship, because a person can have more events and a > event can have more persons. After I have added a few Persons to an Event > I'd like to display them on in a Table. But how? I tried a Binding with > Events - selection - person.firstName but then always comes this Error. > > 2010-02-02 20:37:39.948 Kegeln[4128:a0f] [<_NSFaultingMutableSet > 0x100227180> addObserver:forKeyPath:options:context:] is not supported. Key > path: firstName
Classic problem. You can't bind through a to-many key path. > I also have tried some other things but cannot figure it out. I have also > tried to add an Observer but wasn't able to. I have tried to add an Observer > to the EventArrayController, but didn't work or maybe i did it wrong. What > can i do? Please help. This looks like exactly the same question I asked about two and a half years ago. Probably 75% of what I said was wrong, but if you discount my profanities and concentrate on the responses from mmalc and others, you should get a proper start on this. http://www.cocoabuilder.com/archive/cocoa/189290-managed-object-wants-per-relationship-attribute.html#189292 In particular, disregard my advice in the final Oct 03 message to use NSManagedObjectContextObjectsDidChangeNotification. I have since learned that NSManagedObjectContextObjectsDidChangeNotification fails to provide what is needed to make a real app which updates dependent properties, supports undo, etc. _______________________________________________ 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
