How to use Custom Step with json serialiaztion

[adar2378]

How to use CustomStep with json_serialization? I currently do not see anyway to parse CustomStep via json input.

I think this line is the reason.

survey_kit/lib/src/steps/step.dart

Line 31 in d0a2c79

factory Step.fromJson(Map<String, dynamic> json) {

There should be a way to add fromJson conversion for custom types I believe?

My CustomStep related code:

class CustomResult extends QuestionResult<String> {
  CustomResult({
    required Identifier? id,
    required DateTime startDate,
    required DateTime endDate,
    required String? valueIdentifier,
    required String? result,
    required this.customData,
    required this.value,
  }) : super(
          id: id,
          startDate: startDate,
          endDate: endDate,
          valueIdentifier: valueIdentifier,
          result: result,
        );

  final String customData;

  final String value;

  @override
  List<Object?> get props => <Object?>[
        id,
        customData,
        valueIdentifier,
        startDate,
        endDate,
        value,
      ];
}

@JsonSerializable()
class CustomStep extends Step {
  CustomStep({
    required super.stepIdentifier,
    super.isOptional = false,
    super.buttonText = 'Next',
    this.title = '',
    this.text = '',
    this.content = const SizedBox.shrink(),
    required this.answerFormat,
  });
  @JsonKey(defaultValue: '')
  final String title;
  @JsonKey(defaultValue: '')
  final String text;
  @JsonKey(includeFromJson: false, includeToJson: false)
  final Widget content;
  final AnswerFormat answerFormat;

  factory CustomStep.fromJson(Map<String, dynamic> json) =>
      _$CustomStepFromJson(json);
  @override
  Map<String, dynamic> toJson() => _$CustomStepToJson(this);

  @override
  Widget createView({required QuestionResult? questionResult}) {
    return CustomAnswerView(
      questionStep: this,
      result: questionResult as CustomResult?,
    );
  }
}

class CustomAnswerView extends StatefulWidget {
  const CustomAnswerView({super.key, required this.questionStep, this.result});
  final CustomStep questionStep;
  final CustomResult? result;

  @override
  State<CustomAnswerView> createState() => _CustomAnswerViewState();
}

class _CustomAnswerViewState extends State<CustomAnswerView> {
  late String? _result;
  @override
  void initState() {
    super.initState();
    _result = 'Adarsh';
  }

  @override
  Widget build(BuildContext context) {
    return StepView(
      step: widget.questionStep,
      resultFunction: () => CustomResult(
        id: widget.questionStep.stepIdentifier,
        startDate: DateTime.now(),
        endDate: DateTime.now(),
        valueIdentifier: _result.toString(),
        result: _result,
        customData: 'some custom data',
        value: 'some value',
      ),
      isValid: widget.questionStep.isOptional || _result != null,
      title: widget.questionStep.title.isNotEmpty
          ? Text(
              widget.questionStep.title,
              style: Theme.of(context).textTheme.displayMedium,
              textAlign: TextAlign.center,
            )
          : widget.questionStep.content,
      child: Column(
        children: [
          Padding(
            padding: const EdgeInsets.only(bottom: 14.0),
            child: Text(
              widget.questionStep.text,
              style: Theme.of(context).textTheme.bodyMedium,
              textAlign: TextAlign.center,
            ),
          ),
        ],
      ),
    );
  }
}

Not sure how to make Task object creation acknowledge this custom steop from json?

Future<Task> getJsonTask() async {
    try {
      final String taskJson =
          await rootBundle.loadString('assets/example_json.json');
      final Map<String, dynamic> taskMap = json.decode(taskJson); // this does not recognize custom step

      return Task.fromJson(taskMap);
    } catch (e) {
      rethrow;
    }
  }

[almogtovim]

Hey, Did you manage to figure it up?