Json_serializable.dart: Json serializer isn't converting inner classes to json

Created on 26 Apr 2020 · 2Comments · Source: google/json_serializable.dart

Hello, I'm currently having an issue with json serializer not converting my data classes to json

I created a class like this

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:meta/meta.dart';
import 'package:json_annotation/json_annotation.dart';
import 'flags.dart';

part 'joke.freezed.dart';
part 'joke.g.dart';

@immutable
@freezed
abstract class Joke with _$Joke {
  const factory Joke({
    int id,
    String category,
    String type,
    String setup,
    String delivery,
    String joke,
    Flags flags,
    bool error,
  }) = _Joke;

  const factory Joke.single({
    int id,
    @required String category,
    @required String type,
    @required String joke,
    @required Flags flags,
    bool error,
  }) = SingleJoke;

  const factory Joke.twoPart({
    int id,
    @required String category,
    @required String type,
    @required String setup,
    @required String delivery,
    @required Flags flags,
    bool error,
  }) = TwoPartJoke;

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

and ran

flutter pub run build_runner watch --delete-conflicting-outputs

and it generated this

// GENERATED CODE - DO NOT MODIFY BY HAND

part of 'joke.dart';

// **************************************************************************
// JsonSerializableGenerator
// **************************************************************************

_$_Joke _$_$_JokeFromJson(Map<String, dynamic> json) {
  return _$_Joke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    setup: json['setup'] as String,
    delivery: json['delivery'] as String,
    joke: json['joke'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$_JokeToJson(_$_Joke instance) => <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'setup': instance.setup,
      'delivery': instance.delivery,
      'joke': instance.joke,
      'flags': instance.flags,
      'error': instance.error,
    };

_$SingleJoke _$_$SingleJokeFromJson(Map<String, dynamic> json) {
  return _$SingleJoke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    joke: json['joke'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$SingleJokeToJson(_$SingleJoke instance) =>
    <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'joke': instance.joke,
      'flags': instance.flags,
      'error': instance.error,
    };

_$TwoPartJoke _$_$TwoPartJokeFromJson(Map<String, dynamic> json) {
  return _$TwoPartJoke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    setup: json['setup'] as String,
    delivery: json['delivery'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$TwoPartJokeToJson(_$TwoPartJoke instance) =>
    <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'setup': instance.setup,
      'delivery': instance.delivery,
      'flags': instance.flags,
      'error': instance.error,
    };

instead of this something like this, __please take note of__ .toJson() __I added to the flagstoJson classes __

// GENERATED CODE - DO NOT MODIFY BY HAND

part of 'joke.dart';

// **************************************************************************
// JsonSerializableGenerator
// **************************************************************************

_$_Joke _$_$_JokeFromJson(Map<String, dynamic> json) {
  return _$_Joke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    setup: json['setup'] as String,
    delivery: json['delivery'] as String,
    joke: json['joke'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$_JokeToJson(_$_Joke instance) => <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'setup': instance.setup,
      'delivery': instance.delivery,
      'joke': instance.joke,
      'flags': instance.flags.toJson(),
      'error': instance.error,
    };

_$SingleJoke _$_$SingleJokeFromJson(Map<String, dynamic> json) {
  return _$SingleJoke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    joke: json['joke'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$SingleJokeToJson(_$SingleJoke instance) =>
    <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'joke': instance.joke,
      'flags': instance.flags.toJson(),
      'error': instance.error,
    };

_$TwoPartJoke _$_$TwoPartJokeFromJson(Map<String, dynamic> json) {
  return _$TwoPartJoke(
    id: json['id'] as int,
    category: json['category'] as String,
    type: json['type'] as String,
    setup: json['setup'] as String,
    delivery: json['delivery'] as String,
    flags: json['flags'] == null
        ? null
        : Flags.fromJson(json['flags'] as Map<String, dynamic>),
    error: json['error'] as bool,
  );
}

Map<String, dynamic> _$_$TwoPartJokeToJson(_$TwoPartJoke instance) =>
    <String, dynamic>{
      'id': instance.id,
      'category': instance.category,
      'type': instance.type,
      'setup': instance.setup,
      'delivery': instance.delivery,
      'flags': instance.flags.toJson(),
      'error': instance.error,
    };

And created a test case to test it. These were the results

Expected: {
            'category': 'Miscellaneous',
            'type': 'twopart',
            'setup': 'What do you call a pile of kittens?',
            'delivery': 'A meowntain.',
            'flags': {
              'nsfw': false,
              'religious': false,
              'political': false,
              'racist': false,
              'sexist': false
            },
            'id': 132,
            'error': false
          }
  Actual: {
            'id': 132,
            'category': 'Miscellaneous',
            'type': 'twopart',
            'setup': 'What do you call a pile of kittens?',
            'delivery': 'A meowntain.',
            'flags': _$_Flags:Flags(nsfw: false, religious: false, political: false, racist: false, sexist: false),
            'error': false,
            'runtimeType': 'twoPart'
          }

These are my dependency versions

Dart VM version: 2.8.0-dev.20.10 (beta)

Flutter 1.17.0-3.2.pre • channel beta • https://github.com/flutter/flutter.git
Framework • revision 2a7bc389f2 (5 days ago) • 2020-04-21 20:34:20 -0700
Engine • revision 4c8c31f591
Tools • Dart 2.8.0 (build 2.8.0-dev.20.10)

json_serializable: ^3.3.0

Thanks

Source