wat.swift

BSNDataController.m

-(NSMutableArray*)fetchFingeringsForNoteObject:(Note*)noteObject {
    
    //slightly different, pulls the fingerings for a note OBJECT
    
    //NSLog(@"Fetching fingering for note object with name: %@", noteObject.name);

    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Fingering" inManagedObjectContext:[self managedObjectContext]];
    [request setEntity:entity];
    
    NSError *error = nil;
    NSMutableArray *mutableFetchResults = [[[self managedObjectContext] executeFetchRequest:request error:&error] mutableCopy];
    if (mutableFetchResults == nil) {
        // Handle the error eventually.
    }
    
    //at this point, the array returned is the entire set of fingerings. this needs to be pared down to just the relevant objects
    
    NSMutableArray *returnArray = [[NSMutableArray alloc] init];
    
    for(Fingering *tempFingering in mutableFetchResults) {
        if ([tempFingering.note isEqual:noteObject])
            [returnArray addObject:tempFingering];
    }
    
    //NSLog(@"Found %d fingerings for note named %@", [returnArray count], noteObject.name);
    
    return returnArray;
}

NotePickerView.swift

        //Ask the data controller for the fingerings associated.
        let dataController = BSNDataController()
        guard let note = dataController.fetchNoteObjects(withName: foundPitch.description).firstObject as? Note else {
            fatalError("Couldn't get the note object from the CoreData store.")
        }
        guard let fingerings = dataController.fetchFingerings(forNoteObject: note) as? [Fingering] else {
        ////Cannot convert value of type 'Note' to expected argument type 'Note!'
            fatalError("No fingerings for the selected note.")
        }