toJson will not add if we use freezed.

[b14cknc0d3]

Describe the bug
toJson will not add if we use freezed.
and show this warning

YourModel must provide a `toJson()` method which return a Map.

To Reproduce
Steps to reproduce the behavior:

1. create a model with freezed

@freezed
class FoodTagCreateModel with _$FoodTagCreateModel {
  const factory FoodTagCreateModel({
    required String name,
    required String description,
  }) = _FoodTagCreateModel;

  factory FoodTagCreateModel.fromJson(Map<String, dynamic> json) =>
      _$FoodTagCreateModelFromJson(json);

}

2. generate a ResApi client that use that model and run build runner

@RestApi()
abstract class CrudApi {
  factory CrudApi(Dio dio, {String? baseUrl}) = _CrudApi;

  @POST('/api/v1/my-model')
  Future<void> createAModel(@Body() MyModel body);

4. See error

MyModel must provide a `toJson()` method which return a Map.
It is programmer's responsibility to make sure the MyModel is properly serialized

Expected behavior
If body is not Map force to add toJson() whether it has toJson() or not.

[b14cknc0d3]

@freezed
class FoodTagCreateModel with _$FoodTagCreateModel {
  const factory FoodTagCreateModel({
    required String name,
    required String description,
  }) = _FoodTagCreateModel;

  factory FoodTagCreateModel.fromJson(Map<String, dynamic> json) =>
      _$FoodTagCreateModelFromJson(json);
  @override
  Map<String, dynamic> toJson() => toJson();
}

Temporary solution.

[fryette]

Duplicate.
Correct solution is:

1. Add build.yaml with next snippet

  freezed:
   runs_before:
     - json_serializable 
  json_serializable: 
     runs_before:
      - retrofit_generator

[lailai0715]

Duplicate. Correct solution is:

1. Add build.yaml with next snippet

  freezed:
   runs_before:
     - json_serializable 
  json_serializable: 
     runs_before:
      - retrofit_generator

Not working in env flutter 3.24
build_runner: ^2.4.11
freezed: ^2.5.2
json_serializable: ^6.8.0
retrofit_generator: ^8.1.2
riverpod_generator: ^2.4.0

The generated retrofit class didn't auto insert toJson() from my freezed class

client.dart

part 'auth_client.g.dart';

@RestApi()
abstract class AuthClient {
  factory AuthClient(Dio dio, {required String baseUrl}) = _AuthClient;

  @POST("/members/login")
  Future<ApiResponse<LoginResponse?>> login(@Body() LoginBody body);
}

retrofit.g.dart

@override
  Future<ApiResponse<LoginResponse?>> login(LoginBody body) async {
    final _extra = <String, dynamic>{};
    final queryParameters = <String, dynamic>{};
    final _headers = <String, dynamic>{};
    /// toJson() is missing here
    final _data = body;
    final _result = await _dio.fetch<Map<String, dynamic>>(
        _setStreamType<ApiResponse<LoginResponse>>(Options(
      method: 'POST',
      headers: _headers,
      extra: _extra,
    )

login_body.dart

part 'login_body.freezed.dart';
part 'login_body.g.dart';

@Freezed()
sealed class LoginBody with _$LoginBody {
  const factory LoginBody({
    @JsonKey(name: "phone_no") String? phoneNo,
    String? password,
    String? email,
    String? otp,
    @JsonKey(name: "login_method")
    @Default(LoginMethod.phonePassword)
    LoginMethod loginMethod,
  }) = _LoginBody;

  factory LoginBody.fromJson(Map<String, dynamic> json) =>
      _$LoginBodyFromJson(json);
}

[nicolasWenia]

@freezed
class FoodTagCreateModel with _$FoodTagCreateModel {
  const factory FoodTagCreateModel({
    required String name,
    required String description,
  }) = _FoodTagCreateModel;

  factory FoodTagCreateModel.fromJson(Map<String, dynamic> json) =>
      _$FoodTagCreateModelFromJson(json);
  @override
  Map<String, dynamic> toJson() => toJson();
}

Temporary solution.

This worked for me but it'd be good to not have to do this to make the generator happy

[ToniVinter]

@lailai0715 , did you find a solution? I have the same problem

[lailai0715]

@lailai0715 , did you find a solution? I have the same problem

follow the temporary solution provided by @nicolasWenia , it's working in my project

Packages version used:
retrofit: ^4.1.0
retrofit_generator: ^8.1.2