On Sep 27, 2012, at 10:42 PM, Joseph M. Wollard wrote:

> I'm pretty sure I'm doing something wrong here. I have an NSTreeController 
> bound to the 'value' of an NSOutlineView's table column. The 
> NSTreeController's content is then bound to a property of one of my classes 
> which feeds it an appropriate hierarchy of NSMutableDictionary objects. So, 
> dict -> tree -> outline. All data is being displayed beautifully in the 
> outline view.
> 
> I'd like to observe a notification when a user edits (renames) an item in the 
> outline view that tells me the old and new values. I'm getting notifications, 
> but the old and new values are always null. For what it's worth, I'm 
> currently observing the "content.name" key path of the NSTreeController 
> instance - not sure if that makes a difference.
> 

Seems like there's something that's not being passed, observed or called 
properly.  Unlike when calling a unimplemented method in an object which 
crashes Objective C, I've found out that notifications of the wrong method name 
don't crash, but simply act as if nothing has happened.  What has happened was 
that a notification was issued, but the method might have been misspelled and 
the program merrily continues without crashing but without telling you that 
there was no method to intercept and process that notification.  That happened 
to me a few weeks ago.  That doesn't sound like your problem, but thought that 
might help.

But, if the observed and new values are null, I'd guess that your reference to 
content.name isn't the correct reference to the object.  Try tracing through 
the debugger to see where it thinks it's getting the value from.


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