[WARNING] retrofit_generator on retrofit @RestApi() must provide a toJson() method which return a Map

[okdevy]

Having these [WARNING]s when generating retrofit services:



Code snippet:

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:models/enums/user_type.dart';

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

@Freezed()
class LoginBody with _$LoginBody {
  factory LoginBody({
    required String email,
    required String password,
    @JsonKey(name: 'user_type') required UserTypeEnum userType,
  }) = _LoginBody;

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

dart run build_runner build --delete-conflicting-outputs

Building package executable... (3.9s)
Built build_runner:build_runner.
[INFO] Generating build script completed, took 148ms
[INFO] Precompiling build script... completed, took 4.4s
[INFO] Building new asset graph completed, took 400ms
[INFO] Checking for unexpected pre-existing outputs. completed, took 3ms
[INFO] Generating SDK summary completed, took 2.7s
[WARNING] retrofit_generator on lib/api/auth.dart:
LoginBody must provide a `toJson()` method which return a Map.
It is programmer's responsibility to make sure the LoginBody is properly serialized
[WARNING] retrofit_generator on lib/api/auth.dart:
……..

[INFO] Running build completed, took 4.6s
[INFO] Caching finalized dependency graph completed, took 41ms
[INFO] Succeeded after 4.7s with 55 outputs (162 actions)



environment:
  sdk: '>=2.19.2 <3.0.2'

dependencies:
  dio: ^5.1.2
  fast_immutable_collections: ^9.1.1
  freezed_annotation: ^2.2.0
  json_annotation: ^4.8.1
  logging: ^1.2.0
  models:
    path: ../models
  retrofit: ^4.0.1

dev_dependencies:
  build_runner: '>=2.3.0 <4.0.0'

  freezed: ^2.3.4
  json_serializable: ^6.7.0
  lint:
    git:
      url: "https://github.com/pro100andrey/lint.git"
  retrofit_generator: ^7.0.1

dependency_overrides:
  analyzer: ^5.5.0 




~ flutter doctor -v
 
[✓] Flutter (Channel stable, 3.10.1, on macOS 13.4 22F66 darwin-arm64, locale en-UA)
   • Flutter version 3.10.1 on channel stable at /Users/oleksandrkrinickyi/flutter
   • Upstream repository https://github.com/flutter/flutter.git
   • Framework revision d3d8effc68 (8 days ago), 2023-05-16 17:59:05 -0700
   • Engine revision b4fb11214d
   • Dart version 3.0.1
   • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0-rc1)
   • Android SDK at /Users/oleksandrkrinickyi/Library/Android/sdk
   • Platform android-33, build-tools 34.0.0-rc1
   • ANDROID_HOME = /Users/oleksandrkrinickyi/Library/Android/sdk
   • Java binary at: /Applications/Android
     Studio.app/Contents/jbr/Contents/Home/bin/java
   • Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
   • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3)
   • Xcode at /Applications/Xcode.app/Contents/Developer
   • Build 14E222b
   • CocoaPods version 1.12.1

[✓] Chrome - develop for the web
   • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.1)
   • Android Studio at /Applications/Android Studio.app/Contents
   • Flutter plugin can be installed from:
     🔨 https://plugins.jetbrains.com/plugin/9212-flutter
   • Dart plugin can be installed from:
     🔨 https://plugins.jetbrains.com/plugin/6351-dart
   • Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)

[✓] VS Code (version 1.78.2)
   • VS Code at /Applications/Visual Studio Code.app/Contents
   • Flutter extension version 3.64.0

[✓] Connected device (3 available)
   • iPhone 14 Pro Max (mobile) • C6D7D553-C66C-4058-A0F7-E3ECFFCBEE3D • ios
     • com.apple.CoreSimulator.SimRuntime.iOS-16-4 (simulator)
   • macOS (desktop)            • macos                                • darwin-arm64
     • macOS 13.4 22F66 darwin-arm64
   • Chrome (web)               • chrome                               • web-javascript
     • Google Chrome 113.0.5672.126

[✓] Network resources
   • All expected network resources are available.

• No issues found!

[donpaul120]

I'm also having this issue, please, were you able to make this work @venomanse

[HelenaSewell]

Are you using Dart 3? The problem might be this: rrousselGit/freezed#916

[okdevy]

Are you using Dart 3? The problem might be this: rrousselGit/freezed#916

yes, that issue came when I migrated to dart 3.

Thank you for response.

[okdevy]

Are you using Dart 3? The problem might be this: rrousselGit/freezed#916

refer to reply from @HelenaSewell

[PITPL-Yogita-Agarwal]

this issue has not been resolved @venomanse, it is still not quite clear to me how to solve this,is this issue solved..

[mrruby]

Still not resolved

[lucasdidur]

This happens when using @Body annotation