Conditional provider ?

[matanshukry]

I have 2 providers:

• AppState, which can be in loading, loaded and error. When loaded, it has the url of the backend.
• UserService , which uses AppState to know to which url to send requests to.

Currently what I had in mind:

final appStateProvider = StateNotifierProvider<AppStateNotifier, AppState>((ref) => AppStateNotifier(ref.watch(dioProvider)));

final userServiceProvider = Provider<UserService>((ref) => UserService(ref.watch(dioProvider), ref.watch(appStateProvider.select((state) => state.currentConfigIfLoaded?.host))));

The problem is with state.currentConfigIfLoaded?.host - which is a nullable string.

• It has to be nullable, since app state can be in different states where the value is null
• userService should not accept null host, since it can't do anything in that case.

How would one solve it?