Core Data generated primitive accessors are used to get and set values from and 
to the managed object's private internal store. Core Data generated primitive 
accessors do not have change notification. If primitive accessors are present, 
Core Data will use them during undo and redo.

A managed object may have resources that need to be updated when a property 
changes. During undo and redo primitive accessors are used to change the 
property but because primitive accessors do not have change notification there 
is no way for the managed object to be notified that the property has changed.

The only solution seems to be to use custom primitive accessors that have 
change notification.

What am I doing wrong?

Thanks,
Richard Charles


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