Realm Migration

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    RLMRealmConfiguration *config = [RLMRealmConfiguration defaultConfiguration];
    config.schemaVersion = 2;
    config.migrationBlock = ^(RLMMigration *migration, uint64_t oldSchemaVersion) {
        // We haven’t migrated anything yet, so oldSchemaVersion == 0
        if (oldSchemaVersion < 1) {
            // Nothing to do!
        }
    };
    [RLMRealmConfiguration setDefaultConfiguration:config];
    [RLMRealm defaultRealm];
    return YES;

}

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