How to observe Core Data add/remove actions?

FROM : Arthur C.
DATE : Tue Nov 13 23:29:13 2007

I have a set of Core Data objects, which consist of properties that need to be communicated to other (non-Core Data) parts of the application. In fact, the properties of the currently selected object are 'active' and need to be communicated.
I currently observe the corresponding array controller for the key @"selection.myProperty" to do that.
When an object is added or removed, I observe "arrangedObjects.@count", which is indeed triggered on add/remove actions. However, when I read the selected properties, I still get the 'old' selected properties, not the ones from the new object.

So, what is the correct way to do this?


Thanks in advance,
Arthur C.
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