How to fix the problem of 'Object of type XXXXX is not registered inside GetIt' in flutter?

Question

I am trying to use get_it in order to create a singleton object to be used. I do not wish to use multiple objects of API which is connecting to Firebase. The singleton object is that of Api call for firebase.

I have used the following code

locator.registerLazySingleton<Api>(() => new Api('teams')) ;

while following code works

locator.registerLazySingleton<TeamViewModel>(() => new TeamViewModel()) ;

The structure of Api class is as follows:

class Api{
  final Firestore _db = Firestore.instance;
  final String path;
  CollectionReference ref;
  
  Api( this.path ) {
    ref = _db.collection(path);
  }

  Future<QuerySnapshot> getDataCollection() {
     return ref.getDocuments() ;
  }
}`

This is how I use the API singleton object:

Api _api = locator<Api>();

while the following code works fine:

Api _api = Api('team');

I get the following error in console:

I/flutter ( 2313): The following _Exception was thrown building MultiProvider:

I/flutter ( 2313): Exception: Object of type Api is not registered inside GetIt

I wish to know if this is even possible of using getit is not the right way to go about this.

Solution 1

don't forget to call setupLocator in your main app file before App init

  setupLocator();
  runApp(MyApp());

Solution 2

Try the following code on your main function.

GetIt locator = GetIt.instance;

void main() {

  locator.registerLazySingleton<Api>(() => new Api('teams')) ;

  runApp(MyApp());
}

Or try to have a separate file for your service locator like:

service_locator.dart

GetIt sl = GetIt.instance;

final httpLink = HttpLink(...);

final GraphQLClient client = GraphQLClient(
  cache: InMemoryCache(),
  link: httpLink,
);

void setUpServiceLocator() {
  // Services
  sl.registerSingleton<LocationsService>(LocationsService(http.Client()));
  ...

  // Managers
  sl.registerSingleton<LocationsManager>(LocationsManager());
  ...
}

main.dart

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  setUpServiceLocator();
  runApp(MyApp());
}

some_file.dart

import 'package:my_awesome_app/service_locator.dart';

...
// call it anywhere you want on your code
sl<LocationsManager>().updateLocationsCommand.execute(query);

// or
sl.get<LocationsManager>().updateLocationsCommand.execute(query);

Solution 3

Try version GetIt. I use ^3.0.3. It work for me. Maybe you use old version.

Solution 4

answer for those who face this error in 2021 with dependency get_it: ^5.0.3

make class locator. dart

import 'package:get_it/get_it.dart';
import 'package:rest_api_work/Service/note_service.dart';

final locator = GetIt.instance;

void setUpLocator() 
{

locator.registerLazySingleton<NoteService>(() =>NoteService());

}

Now call this method setUpLocator in main.dart

  void main() 
 {

   setUpLocator() ;
   runApp(MyApp());
  }

and now make a property of locator class where you show your data because my data is list type you can see in noteservice.dart that's why I receive this property in the List type class

List<NoteForListing> notes = [];
 void initState()  {
         List<NoteForListing> service =  locator.get<NoteService>().getNotesList();
 
    setState(() {
      notes = service;    });
  
       super.initState();   }

and at last noteserverice.dart

import 'package:rest_api_work/models/note_for_listing.dart';

class NoteService
{
  List<NoteForListing> getNotesList()
  {
     return
     [
    new NoteForListing(
      noteID :"1",
      noteTitle:"Note 1",
      createDateTime:DateTime.now(),
      latestEditDateTime:DateTime.now()
    ),
       new NoteForListing(
      noteID :"2",
      noteTitle:"Note 2",
      createDateTime:DateTime.now(),
      latestEditDateTime:DateTime.now()
    ),
       new NoteForListing(
      noteID :"3",
      noteTitle:"Note 3",
      createDateTime:DateTime.now(),
      latestEditDateTime:DateTime.now()
    )
  ];
  
  }
}

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Comments

[Arpit Bansal]

Still the issue remains the same.

[Simas Joneliunas]

Your code does exactly the same thing as one of the examples in the earlier answer

[devmike01]

There is no difference between this code snippet and that of the original post.

[Admin]

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