Riverpod class: State update on Class properties

[muddi900]

I have a class and associated notifier.

class ImageDesc {
  final String id;
  String? _description;
  ({String mimeType, Uint8List bytes})? _image;
  

  ImageDesc() : id = const Uuid().v4();

  ImageDesc.withId(this.id);

  set description(String? text) {
    if (_description != null) {
      throw Exception("Model properties can't be rewritten");
    }
    _description = text;
  }

  String? get description => _description!;

  set image(({String mimeType, Uint8List bytes})? imageData) {
    if (_image != null) {
      throw Exception("Model properties can't be rewritten");
    }
    _image = imageData;
  }

  ({String mimeType, Uint8List bytes})? get image => _image;

}

@riverpod
class ImageDescNotifier extends _$ImageDescNotifier {
  @override
  ImageDesc build(
      {String? id,
      ({String mimeType, Uint8List bytes})? image,
      String? description,}) {
    if (id != null) {
      final ig = ImageDesc.withId(id);
      ig.image = image!;
      ig.description = description!;
      return ig;
    }
    return ImageDesc();
  }

  void setdescription(String text) => state.description = text;
  void setimage(({String mimeType, Uint8List bytes}) image) =>
      state.image = image;
  void reset() => state = ImageDesc();
}

I have a widget that is based on this notifer. However when I set the image, the widget does not rebuild.

final imageGenNotifier = ref.read(imageGenerationNotifierProvider().notifier);

//...

child: InkWell(
                  onTap: () async {
                    final picker = ImagePicker();
                    final pickedImage = await picker.pickImage();

                    imageGenNotifier.setImage((mimeType: pickedImage.mimeType!, bytes: await pickedImage.readAsBytes()));
                  }

Upon Hot Reload, the I get null check error on the description property of the class.

What might be causing this?

[muddi900]

I reduced the boilerplate, but the issue persists

class ImageGen {
  List<({Uint8List bytes, String mimeType})> images = [];
  String prompt = '';
  String responseText = '';
}

@riverpod
class ImageGenNotifier extends _$ImageGenNotifier {
  @override
  ImageGen build() {
    return ImageGen();
  }

  void setImages(List<({Uint8List bytes, String mimeType})> images) =>
      state.images = images;

  void setPrompt(String prompt) => state.prompt = prompt;

  void setResponse(String responseText) => state.responseText = responseText;
}

How do I trigger a rebuild here?

[gdurandrexel]

You must assign a value to state if you want to trigger a rebuild of the widget: state = state.copyWith(images: images);. Look at the setter of state for more info.

You can use some copywith package to generate a copyWith() function for your state.