Graphql not initialized in get_it

[Aminul-Haque-Aome]

I want to implement GraphQL client in my flutter app. For Dependency injection, I use GetIt library. But when I run the app, it says

Invalid argument (Object of type HomeGraphQLService is not registered inside GetIt. Did you forget to pass an instance name? (Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;)): HomeGraphQLService

Session.dart

abstract class Session {
  String getAccessToken();
}

SessionImpl.dart

class SessionImpl extends Session {
  SharedPreferences sharedPref;

  SessionImpl(SharedPreferences sharedPref) {
    this.sharedPref = sharedPref;
  }

  @override
  String getAccessToken() {
    return sharedPref.getString('access_token') ?? "";
  }

}

GraphQLClientGenerator.dart

class GraphQLClientGenerator {
  Session session;

  GraphQLClientGenerator(Session session) {
    this.session = session;
  }

  GraphQLClient getClient() {
    final HttpLink httpLink = HttpLink('https://xxx/graphql');
    final AuthLink authLink = AuthLink(getToken: () async => 'Bearer ${_getAccessToken()}');
    final Link link = authLink.concat(httpLink);

    return GraphQLClient(link: link, cache: GraphQLCache(store: InMemoryStore()));
  }

  String _getAccessToken() {
    return session.getAccessToken();
  }
}

ServiceLocator.dart

Future<void> initDependencies() async {
  await _initSharedPref();
  _initSession();
  _initGraphQLClient();
  _initGraphQLService();
}

Future<void> _initSharedPref() async {
  SharedPreferences sharedPref = await SharedPreferences.getInstance();
  serviceLocator.registerSingleton<SharedPreferences>(sharedPref);
}

void _initSession() {
  serviceLocator.registerLazySingleton<Session>(()=>SessionImpl(serviceLocator()));
}

void _initGraphQLClient() {
  serviceLocator.registerLazySingleton<GraphQLClient>(() => GraphQLClientGenerator(serviceLocator()).getClient());
}

void _initGraphQLService() {
  serviceLocator.registerLazySingleton<HomeGraphQLService>(() => HomeGraphQLService(serviceLocator()));
}

main.dart

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  SystemChrome.setPreferredOrientations(
    [DeviceOrientation.portraitUp, DeviceOrientation.portraitDown],
  );
  
  await initDependencies();

  runApp(MyApp());
}

[escamoteur]

in which line does it throw the exception?

[Aminul-Haque-Aome]

in which line does it throw the exception?

it said, HomeGraphQlService not registered inside Get_it. But I have already registered that. I really don't know, what the actual problem is

[Aminul-Haque-Aome]

in which line does it throw the exception?

here is my HomeGraphQLService class

class HomeGraphQLService {
  GraphQLClient graphQLClient;

  HomeGraphQLService(GraphQLClient graphQLClient) {
    this.graphQLClient = graphQLClient;
  }

  Future<SubjectResponse> getAllCourseOf(String className, String groupName) async {
    try {
      final response = await graphQLClient.query(getAllCourseQuery(className, groupName));
      return SubjectResponse.fromJson((response.data));
    } on OperationException catch (exception) {
      return Future.error(exception.toString());
    }
  }
}

QueryOptions getAllCourseQuery(String className, String groupName) {
  String query = """
    query GetSubject($className: String, $groupName: String) {
      subjects(class: $className, group: $groupName) {
        code
        display
        insights {
          coming_soon
          purchased
        }
      }
    }
    """;

  return QueryOptions(
    document: gql(query),
    variables: <String, dynamic>{
      'className': className,
      'groupName': groupName,
    },
  );
}

[escamoteur]

And where do you try to access HomeGraphQlService ? that's what I meant with in which line in your code does it throw the exception