Hi all,
I'm writing an app where one Core Data entity -- Folder -- has
(conceptually) a to-many relationship with another object -- Item. But
I want to keep those items in a particular order, so I have a third
entity, OrderedItem, which keeps a reference to the folder along with
a reference to the item and also adds an order attribute to track the
item's position in the folder.
This is rather cumbersome to maintain, so I've implemented the key-
value coding methods for a to-many relationship:
- (NSUInteger) countOfItems
- (Item *)objectInItemsAtIndex:(NSUInteger)index;
- (void)insertObject:(Item *)item inObjectsAtIndex:(NSUInteger)index;
- (void)removeObjectFromItemsAtIndex:(NSUInteger)index;
This works really well just about everywhere. However, in my window
controller's delete: method, calling mutableArrayValueForKey:@"items"
gives me this exception:
2008-08-30 16:11:27.718 MyApp[6436:813] *** -
[NSKeyValueFastMutableArray2 count]: value for key items of object
0x2a7dc0 is nil
Any ideas?
Thanks,
Alex
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