I have a bid revision object that holds a to-many NSSet reference to a
group of items that constitute a tree. Some of those items are roots
and have a nil parent. In my bid revision object I've set up a
rootItems method that uses a predicate to return a filtered set of the
items with nil parents and uses keyPathsForValuesAffectingRootItems to
be aware of changes to the items set as a whole and generate
appropriate KVO notifications.
I have a problem though that when an item that's already in the set,
but not a root, becomes a root by having its' parent set to nil. This
does not cause KVO notifications to be sent out for the rootItems
property because technically the items set as a whole has not changed.
I naïvely tried to add @"items.parent" to the keyPathsForValues...
method which of course didn't work since you can't observe groups of
properties in a set or array. Right now, I'm sending a willChange/
didChange method pair after performing parent changes of subitems and
after undo/redo events and it *seems* to be working fine. This seems
grotesque though and sure to cause me problems later.
Is there any way to force a KVO update of a property besides a
willChange/didChange method pair?
Is there a better way?
Ashley_______________________________________________
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