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observing set mutations

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observing set mutations

Subject: observing set mutations
From: Paul Forgey <email@hidden>
Date: Mon, 12 Sep 2005 02:14:15 -0700

I'm trying to observe set mutations for a to-many relationship. In my observer I can see items being added and removed OK. If the item is changed via the inverse to-one relationship updating to another value, things get screwy.

When adding the observer, I'm passing NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld to the options field. When the item is modified, I get NSKeyValueChangeSetting, no value for the NSKeyValueChangedNewKey, and the NEW value in the NSKeyValueChangedOldKey.

To investigate further I implemented willChangeValueForKey:withSetMutation:usingObjects in my subclass. What I am seeing here lines up with this behavior. NSKeyValueMinusSetMutation with the new object in usingObjects.

What the heck is going on, and how do I simply observe to-many objects being inserted or removed for whatever reason?

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