import 'package:json_annotation/json_annotation.dart'; part 'category.g.dart'; @JsonSerializable() class Category { int? id; @JsonKey(name: 'parent_id') int? parentId; String? name; Category({this.id, this.parentId, this.name}); factory Category.fromJson(Map json) { return _$CategoryFromJson(json); } Map toJson() => _$CategoryToJson(this); }