Disabling undo for a specific operation of Core Data

disable_undo.m

- (void)method
{
    NSUndoManager *undoManager = [self undoManager];
    [undoManager disableUndoRegistration];
    
    /* do something */
    
    [self.managedObjectContext processPendingChanges];
    [undoManager enableUndoRegistration];
}