CoreData Lightweight Migration

I have been dreading my CoreData migration for a while now. I just jumped into the documenation and found this little chestnut.

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:

[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,

[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];

I added the new models and attributes to my model. No data needed to be migrated across entities and no entities or attributes needed to be renamed. Viola, easy migration. Phew.