Inheritance Issue with Json Serializable

[PurushottamHari]

///////////////////////////////////////////////////////////////////////////// "This is the implementation of my classes"

@JsonSerializable() class BodyGroup{

final Map<String,bool> parts;

BodyGroup(this.parts){ debugPrint("Constructor called and initialized!:"+parts.toString()); }

//Abstract function Map<String,double> tabMap(){ return {}; }

void incrementTabMap(Map<String,double> tabMap){ tabMap.forEach((String part, double hits) { debugPrint("TabMap:"+tabMap.toString()); debugPrint("Part:"+part); debugPrint("Parts:"+parts.toString()); if(parts[part]) tabMap[part] = tabMap[part] + 1; }); }

factory BodyGroup.fromJson(Map<String,dynamic> data) => _$BodyGroupFromJson(data);

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

@JsonSerializable() class Shoulders extends BodyGroup{

Shoulders({bool front=false,bool rear=false}) : super({"front":front,"rear":rear});

factory Shoulders.fromJson(Map<String,dynamic> data) => _$ShouldersFromJson(data);

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

@override Map<String,double> tabMap() { return { "front":0, "rear":0 }; }

}

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Now when I make an object of Shoulder class and serialize it......it doesn't include the "parts" map which is initialized always in the BodyGroup Parent class....

Can you please help me out here

[PurushottamHari]

I have found that the jsonSerializable is not considering the attributes of the super class......I am having to specify it manually in the generated code

Map<String, dynamic> _$ShouldersToJson(Shoulders instance) => <String, dynamic>{ 'parts': instance.parts, };

Is there a way to make the JsonSerializer consider the super class attributes as well?

[k-paxian]

This library https://github.com/k-paxian/dart-json-mapper does what you need.

[ivard]

The issue I had was that I forgot to include the inherited attributes in the default constructor of the child class. Because the attribute is marked as final in the parent class, json_serializable has no way to initialize the inherited attributes.

In this specific example, you can try to convert the Shoulders({bool front=false,bool rear=false}) constructor to a named factory constructor and make a new default constructor that does use Map<String,bool> parts directly. That solved the issue for me.

I hope that helps.