Async Object doesn't register with get_it

Question

I'm using get_it for IoC. However, my app throws an exception when I try to register a bean using an async call. The function that throws the exception:

import 'package:elpee/service/localstorage_service.dart';
import 'package:get_it/get_it.dart';


GetIt locator = GetIt();
Future setupLocator() async {
  LocalStorageService.getInstance().then((storageService) {
    locator.registerSingleton(storageService);
  });
}

The error: Exception: Object of type LocalStorageService is not registered inside GetIt

If anyone could help me out, I'd greatly appreciate it :-)

Answer 1

You are trying to use get_it wrong way. Check to documentation.

First of all - get_it is Singleton, therefore don't use constructor, but

GetIt locator = GetIt.instance;

Second - implement LocalStorageService as a plain class and let the get_it to provide it as a Singleton:

void main()
...
   void setupLocator() {
     locator.registerLazySingleton(LocalStorageService());
   }
}

To use full power of IoC define interface / abstract class definition for your storageservice and provide implementation of the interface.

void setupLocator() {
  locator.registerLazySingleton<IStorageService>(LocalStorageService());
}