How to update a get it instance in flutter?

user_11678970 0
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I am using the getIt package to create instances in my application.

instance.registerLazySingleton<DioFactory>(() => DioFactory(instance()));

  // app  service client
  final dio = await instance<DioFactory>().getDio();
  instance.registerLazySingleton<AppServiceClient>(() => AppServiceClient(dio));

Above code is for initialising the instances. The getDio() function:

Future<Dio> getDio() async {
    Dio dio = Dio();
    int _timeOut = 60 * 1000; // 1 min
    String language = await _appPreferences.getAppLanguage();
    Map<String, String> headers = {
      CONTENT_TYPE: APPLICATION_JSON,
      ACCEPT: APPLICATION_JSON,
      AUTHORIZATION: Constants.token,
      DEFAULT_LANGUAGE: language
    };

    dio.options = BaseOptions(
        baseUrl: Constants.baseUrl,
        connectTimeout: _timeOut,
        receiveTimeout: _timeOut,
        headers: headers);

    if (kReleaseMode) {
    } else {
      dio.interceptors.add(PrettyDioLogger(
          requestHeader: true, requestBody: true, responseHeader: true));
    }

    return dio;
  }

When I build my application for the first time the Constants.token has a blank value. But in the middle of the application I wish to add a value into it. I am able to change that value but when I see the logs from dio logger it still displays the empty string in the "Authorisation" field.

How do I update my instance so that I can change my token value for my API requests?

dart flutter instance
2 Answers

you have to register your dio with registerFactory to getit. In your case you are registering as singleton, that's why it is giving you same instance

user_101702950

First you should create an interceptor that call TokenInterceptor with override onRequest method. Inside onRequest method you can modify your headers like below:

https://i.stack.imgur.com/T6PFR.png

And final step you only add to your dio interceptor like that:

dio.interceptors.add(TokenInterceptor());
user_196514020
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