Converting extended Riverpod StateNotifier Providers to Code Generation Providers

[simon-iversen]

I have a question regarding how to convert some Riverpod StateNotifier Providers to Code Generation Providers. Hopefully it is not too long, but I tried to make it as short as possible without loosing relevant information.

I have this class to store filter options

class StatsFilterOptions {
  StatsFilterOptions(
      {this.tagOptions,
      this.dateOptions});
  StatsFilterTagOptions? tagOptions;
  StatsFilterDateOptions? dateOptions;
  // It has more fields and methods, but I'm simplifying it here
}

I then created this StateNotifier to manage the state of the filter options.

class StatsFilterOptionsNotifier extends StateNotifier<StatsFilterOptions> {
  StatsFilterOptionsNotifier() : super(StatsFilterOptions());

  void updateDates(DateTime? startDate, DateTime? endDate) {
    state = state.copyWith(
      dateOptions: StatsFilterDateOptions(
        endDate: endDate,
        startDate: startDate,
      ),
    );
  }
  void addTag(String tag) {
    // Update the state
  }
  void removeTag(String tag) {
    // Update the state
  }
  void sortTagsAZ(bool enabled) {
    // Update the state
  }
  //More methods to update the state

}

In my app, I have different kinds of test types, like endurance, peakload, live data and so on..

Then I have different providers that uses this same StateNotifier to update the state.

class EnduranceFilterOptionsNotifier extends StatsFilterOptionsNotifier {
  EnduranceFilterOptionsNotifier() : super();
  //Here you can add additional methods specific to the critical force test
  //Maybe create an endurance class that extends 'StatsFilterOptions' as well,
  //with fields specific to endurance tests
}

final enduranceFilterOptionsProvider = StateNotifierProvider<
    EnduranceFilterOptionsNotifier,
    StatsFilterOptions>((ref) => EnduranceFilterOptionsNotifier());


class LiveDataFilterOptionsNotifier extends StatsFilterOptionsNotifier {
  LiveDataFilterOptionsNotifier() : super();
}

final liveDataFilterOptionsProvider = StateNotifierProvider<
    LiveDataFilterOptionsNotifier,
    StatsFilterOptions>((ref) => LiveDataFilterOptionsNotifier());

Here is my issue/question:

I want to convert these providers into riverpod code generation style.

The StatsFilterOptionsNotifier could probably be converted like this:

@riverpod
class StatsFilterOptionsNotifier extends _$StatsFilterOptionsNotifier {
  @override
  StatsFilterOptions build() {
    return StatsFilterOptions();
  }
  //Methods to update the state
}

I see that the name StatsFilterOptionsNotifier should probably be renamed to StatsFilterModifier or something.

However, how to do it like the other providers for the separate tests (endurance, live data and so on) using code generation?

Are there some other ways to structure this?

[simon-iversen]

Does anyone have any input on this?

[moxiaov587]

I think mixin might be useful for you, you can take a look at #1960.

[simon-iversen]

Thanks! I'll take a look.