twong-flutter/lib/models/message.dart

import 'package:json_annotation/json_annotation.dart';

part 'message.g.dart';

@JsonSerializable()
class Message {
    Message();

    num id;
    String sender;
    String subject;
    String desc;
    String body;
    num add_time;
    num expire_at;
    num read;
    
    factory Message.fromJson(Map<String,dynamic> json) => _$MessageFromJson(json);
    Map<String, dynamic> toJson() => _$MessageToJson(this);
}