Removing particular undo/redo actions with Core Data

FROM : Aaron Jacobs
DATE : Tue Aug 08 07:20:25 2006

I have a situation in which whenever a particular action is performed 
on an managed object, it instantly becomes a problem for any undo 
actions to be performed on that object, but it is totally fine for 
the existing actions on the undo stack to remain for the rest of the 
managed objects.

I know that you can temporarily disable undo action registration, but 
what I want to do in this case is get rid of *all* past undo actions 
for the object, but only that particular object and not everything 
else.  NSUndoManager's removeAllActionsWithTarget: is pretty much 
exactly what I want, but calling that with the managed object in 
question as the argument does not seem to remove any undo actions, 
presumably because Core Data handles the undo registrations in a less 
straight-forward manner than just registering them for the managed 
object itself.

Is there any way to accomplish what I want to do, or am I just going 
to have to settle for clearing the entire undo stack for now and file 
an enhancement request for later?