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POCoreData throws exception with NSUndoManager
 

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    <p>I have an iPad app where I am using the NSUndoManager with Core Data. Things usually work well, except that there is a semi-reproducible bug when I undo/redo several times. I am only working on the main thread (at least, I have disabled MagicalRecords from using an NSManagedObject on a secondary thread. The problem always occurs if I try to undo/redo an insertion of an NSManagedObject to the context.</p> <p>So I have something like this:</p> <pre><code>if (!self.undoManager.isUndoing &amp;&amp; !self.undoManager.isRedoing) { [self.undoManager undo]; } else { NSLog(@"gotcha!"); } </code></pre> <p>And after several times, I get the following exception. It happens on a secondary thread, which makes me think Core Data is doing something in the background. </p> <pre><code>CoreData: error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. _registerUndoObject:: NSUndoManager 0xcea2d60 is in invalid state, must begin a group before registering undo with userInfo (null) 2012-07-25 15:42:26.850 TT[3972:3c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '_registerUndoObject:: NSUndoManager 0xcea2d60 is in invalid state, must begin a group before registering undo </code></pre> <p>Sometimes I am also getting EXEC_BAD_ACCESS, other times just the exception above.</p> <p>Any idea what could be causing this?</p> <p>Edit: clarified situation for Mundi (see comments)</p>
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    1. USArie Litovsky
    1. USArie Litovsky
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    1. COYou need to give more context than just the call to `undo`.
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    2. COWhen the undo occurs, I rebuild the UI, which is quite an expensive operation (rebuilding a lot of custom UIViews from the original NSManagedObjects). This eventually will be optimized. It would be hard to provide a snipped of code here (it's a large project) -- what would be useful for you?
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    3. COWhat are you undoing?
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