Couldn't find '.momd' file

Question

My app uses CoreData, with a model named : mupo-ios.xcdatamodel. This model is the second version of the original Model : Model.xcdatamodeld. I was using the managedObjectContext through a document:

        NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSLibraryDirectory inDomains:NSUserDomainMask] lastObject];
        url = [url URLByAppendingPathComponent:@"MyDocument"];

        self.document = [[UIManagedDocument alloc] initWithFileURL:url];

        // Set our document up for automatic migrations
        NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                                 [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
                                 [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];            
        self.document.persistentStoreOptions = options;
    }

And later, I access the managedObjectContext :

    self.managedObjectContext = self.document.managedObjectContext;

Now, I want to access to the main context directly, here's the code:

- (NSManagedObjectContext *)mainContext {
    if (!_mainContext) {
        _mainContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
        _mainContext.persistentStoreCoordinator = self.persistentStoreCoordinator;
    }
    return _mainContext;
}

The problem is when I try to specify the managedObjectModel :

- (NSManagedObjectModel *)managedObjectModel {
    if (!_managedObjectModel) {
NSString *localModelPath = [[NSBundle mainBundle] pathForResource:@"mupo-ios" ofType:@"momd"];
        NSURL *modelUrl = [NSURL fileURLWithPath:localModelPath];    
        _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelUrl];
    }
    return _managedObjectModel;
}

The momd's file can't be found so the managedObjectModel can't be initialized. Can anybody helps me?

Answer 1

This problem happened to me in a complex scenario. I had two xcodeproj in a single workspace.

I tried to use the same xcdatamodeld file in the second project by dragging it from the first project to the second inside xcode. This created a reference correctly, but even when adding the file to the "compile resource", the modm file wasn't created.

The solution was to drag n drop the xcdatamodeld into the second project from the Finder directly and not from the first proj in xcode.

Answer 2

In this line:

NSString *localModelPath = [[NSBundle mainBundle] pathForResource:@"mupo-ios" ofType:@"momd"];

Change momd to mom