How to include a final field in generated code from json

This is my class:

@JsonSerializable()
class Foo {
  final int a = 0; 
  final int b;
  Foo(this.b);

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

  Map<String, dynamic> toJson() => _$FooToJson(this);
}

The generated code doesn't include a field:

Map<String, dynamic> _$FooToJson(Foo instance) => <String, dynamic>{
      'b': instance.b, // Only `b` is generated, `a` is missing.
    };

What should I do to include a in the generated code?

CodePudding user response：

part 'foo.g.dart';

@JsonSerializable()
class Foo {
  int a = 0;
  final int b;

  Foo(this.a, this.b);

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

  Map<String, dynamic> toJson() => _$FooToJson(this);
}

///////

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

Foo _$FooFromJson(Map<String, dynamic> json) => Foo(
      json['a'] as int,
      json['b'] as int,
    );

Map<String, dynamic> _$FooToJson(Foo instance) => <String, dynamic>{
      'a': instance.a,
      'b': instance.b,
    };

CodePudding user response：

if you want easier json parsing, using Dart Data Class Generator extension in VS Code.