CoreData Lightweight Migrations

NSDictionary *options = @{
NSMigratePersistentStoresAutomaticallyOption : @YES,
NSInferMappingModelAutomaticallyOption : @YES
};

.....

[_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil
        URL:storeURL options:options error:&error]