This question relates to an iOS project, iOS 5 or later, developed on 10.8.2 
using Xcode 4.5.1, testing with the iOS Simulator (5.0, 5.1, or 6.0).

I have a new project which uses a reasonably complex Core Data data model. 
There are 10 entities with multiple relationships between them, and a couple of 
attributes in one entity are transformable.

Using this data model, there is a significant problem creating or opening the 
database. Specifically, after creating my UIManagedDocument instance, I call 
either openWithCompletionHandler: or 
saveToURL:forSaveOperation:completionHandler.

The problem is that NEITHER of them invoke their completion handlers. (I've 
waited more than 60 seconds…) The calls return but the completion handlers 
never fire. And the document status remains "closed".

Although I have examined things carefully, I suspect that there is a problem in 
the model which is the ultimate cause of my problem.

While I pursue the laborious task of disassembling my data model into little 
pieces and gradually adding things back until it breaks, I was wondering whether
>> anyone has seen this sort of thing before,
>> anyone knows of any tools or techniques which could be used to examine the 
>> data model and locate (and fix!)  the error which is leading to this problem.


Cheers,

Rick Aurbach
President and Chief Engineer

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