rrousselgit / union Goto Github PK

abstract class BaseModel<T> {
  Map<String, Object> toJson();

  T fromJson(Map<String, Object> json);
}

class HomeResponse extends BaseModel<HomeResponse> {
  List<Data> data;

  HomeResponse({this.data});

  HomeResponse.fromJson(Map<String, dynamic> json) {
    if (json['data'] != null) {
      data = List<Data>();
      json['data'].forEach((v) => data.add(Data.fromJson(v)));
    }
  }

  @override
  HomeResponse fromJson(Map<String, Object> json) {
    return HomeResponse.fromJson(json);
  }

  @override
  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    if (this.data != null) {
      data['data'] = this.data.map((v) => v.toJson()).toList();
    }
    return data;
  }
}


class ErrorResponse {
  final String description;
  final String errorCode;

  ErrorResponse({this.description, this.errorCode});
}

class ApiProvider {
  Union2<ErrorResponse, T> request<T extends BaseModel<T>>(T responseModel) {
    try {
      Map<String, dynamic> body = {"data": []};
      T model = responseModel.fromJson(body);
      return model.asSecond<ErrorResponse>();
    } catch (e) {
      return ErrorResponse(description: e.toString()).asFirst();
    }
  }
}

Future request() async {
    Union2<ErrorResponse, HomeResponse> serverResponse = ApiProvider().request<HomeResponse>(HomeResponse());
    serverResponse.switchCase(
      (ErrorResponse errorResponse) => print('ErrorResponse: ${errorResponse.description}'),
      (HomeResponse homeResponse) => print('HomeResponse: ${homeResponse.toString()}'),
    );
  }

type '((ErrorResponse) => void, (BaseModel<HomeResponse>) => void, Object, Object, Object, Object, Object, Object, Object) => void' 
is not a subtype of 
type '((ErrorResponse) => void, (HomeResponse) => void, Object, Object, Object, Object, Object, Object, Object) => void'

The argument type 'TYPE_HERE' can't be assigned to the parameter type 'void Function(void Function(String), void Function(Photo), Object, Object, Object, Object, Object, Object, Object)'.