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    <p>A UIManagedDocument will save, well, basically, when it feels like it; you don't have control as to when that occurs. It will, however, certainly save on application termination, which is why you see the inserts when you restart.</p> <p>As a result, while you may think you have permanent object ids, they're actually likely temporary, and thus can't be fetched. Simply dumping them via an NSLog would validate this, as temporary object ids show up as such when logged.</p> <p>To force them to be permanent and thus usable, try the following after performing your additions. Assuming you have a UIManagedDocument as an ivar:</p> <pre><code>- (void)performUpdate { NSManagedObjectContext * context = self.managedDocument.managedObjectContext; NSSet * inserts = [context insertedObjects]; if ([inserts count]) { NSError * error = nil; if ([context obtainPermanentIDsForObjects:[inserts allObjects] error:&amp;error] == NO) { NSLog(@"BAM! %@", error); } } [self.managedDocument updateChangeCount:UIDocumentChangeDone]; } </code></pre> <p>Obviously, you'd replace the error handling with something a bit better here. The UIManagedDocument will now save at some point in the future (again, you have absolutely no control over when that'll happen, we're just asking it to do so in the last line, in the same way that an undo manager would), but newly-inserted objects should now have usable permanent ids and fetches should work properly.</p> <p>And yes, this seems a bit odd to me too, but this appears to be the correct way to do things with a UIManagedDocument in play.</p> <p>Frankly, I'd love for someone to tell me I'm incorrect and provide a better solution.</p>
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    1. USAllan Bazinet
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    1. COAllan, THANK YOU!!! This has cost me many hours or spinning my wheels. As you said, this doesn't seem to be a 'required' step from all of the tutorials and instructions I've read, but it is making my app work properly.
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    2. COIf somebody has any idea of how we can prevent needing to use this, I'd be glad to hear it as well.
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    3. COI think it's somewhat telling that there is as of yet no Apple-provided sample code for UIManagedDocument. I think this may be an unintended bug introduced as a result of the new nested managed object contexts, and they're waiting to fix it before providing sample code. One nerd's theory, anyway.
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