Loading CoreData model fails in simulator

Not finding much to match this error message from Google, I am posting this:

I had cause to generate a new version of a CoreData model (xcdatamodel -> xcdatamodeld) and although I was able to happy rely on the automatic model migration when on device, it repeatedly crashed on simulator. The message was:

2010-08-27 16:44:12.566 WildObsLookout[47240:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Bad model.  For entity 'WildObsSearchHistory' superentity 'Account' does not think I am a subentity'

Crazy thing was … I didn’t have any such entity, all mine were prefixed with WildObs.

Turns out this code (not sure where I grabbed it from) was being over zealous on simulator:

NSMutableSet *allBundles = [[[NSMutableSet alloc] init] autorelease];
[allBundles addObjectsFromArray: [NSBundle allBundles]];
[allBundles addObjectsFromArray: [NSBundle allFrameworks]];
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:[allBundles allObjects]] retain];

The fix was to only load the models I wanted and hand merge them:

NSString *modelPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"WildObs.momd"];
NSManagedObjectModel *model = [[NSManagedObjectModel alloc] initWithContentsOfURL:[NSURL fileURLWithPath:modelPath]];

There is no doubt a better way to load only my *.mom files w/o picking each one individually, but I’ll look for that when I get to version #3. I hope this helps somebody.

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What a time saving and efficient app! I’ve been using this app to observe and script classroom observations. The time stamped notes give me the opportunity to record the live action without the constant reminder to watch the clock or stress over calculating the timing of any activity.

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