>>
>>
>> I just had another thought.... I have another core data model in the app. I
>> wonder if the NSPersistentDocument infrastructure is picking up the wrong
>> model? As I'm looking through the project, I realise I don't know how the
>> document knows which core data model to use.... OK, back to the
>> documentation on NSPersistentDocument.
>>
>
> By default it will merge all models in the main bundle. So if the other model
> changed, you would also have a problem. If you want to specify only one model
> for the document, you should override [NSPersistentDocument
> managedObjectModel].
Yes, thanks. I got that from the documents, but doing an override and
explicitly pointing to the model doesn't help.
I have then gone on to check the entity hashes in the XML store on disk against
the hashes in the model loaded for that XML store using this snippet:
NSError *metaerror = nil;
NSDictionary *storeMeta = [NSPersistentStoreCoordinator
metadataForPersistentStoreOfType:nil URL:url error:&metaerror];
NSLog(@"Metadata at URL %@", storeMeta);
NSManagedObjectModel *oldManagedObjectModel = [NSManagedObjectModel
mergedModelFromBundles:@[[NSBundle mainBundle]]
forStoreMetadata:storeMeta];
NSLog(@"Old managed object model %@", [oldManagedObjectModel
entityVersionHashesByName]);
and the hashes all match. So I don't know why the migration says it's can't
locate the source model since I can locate it myself.
More digging...
Cheers,
Martin
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