[Question ] registerSingleton dependencies

[abdel-ships-it]

How are we supposed to do this? I'm having a hard time having services registered with registerSingleton depend on each other.

Example

GetIt.I.registerSingleton<UserStateService>(UserStateService());
GetIt.I.registerSingleton<AppViewStateService>(AppViewStateService());

And UserStateService looks like this

class UserStateService {
  final appViewStateService = GetIt.I.get<AppViewStateService>();
}

This throws the following error

I/flutter ( 6537): Exception 'package:get_it/get_it_impl.dart': Failed assertion: line 372 pos 7: 'instanceFactory != null': Object/factory with  type AppViewStateService is not registered inside GetIt.
package:get_it/get_it_impl.dart:372
I/flutter ( 6537): (Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;

This forces me to put AppViewStateService on top of UserStateService, is there no other way to do this? I tried

GetIt.I.registerSingletonWithDependencies<UserStateService>(() => UserStateService(), dependsOn: [AppViewStateService]);
GetIt.I.registerSingleton<AppViewStateService>(AppViewStateService());

But this throws the following error

I/flutter ( 6537): Exception Invalid argument(s): Dependent Type AppViewStateService is not registered in GetIt

For now I'm forced to change the order of registrations, if there's another way please let me know.

[escamoteur]

you have to register them in the correct sequence. registerSingletonWithDependencies is only helpful if your registration needs to wait on some async initialization of another Singleton.
Also I recommend not to store instances that are registered inside get_it in fields of other objects but always access them over GetIt.I<yourType>()