import 'package:json_annotation/json_annotation.dart'; part 'sign_in.g.dart'; @JsonSerializable(explicitToJson: true) class SignIn { SignIn(); String? balance; String? category; String? createTime; String? createUser; String? id; bool? isDeleted; String? linkId; String? mark; String? mid; String? number; int? pm; bool? status; String? title; String? type; String? updateTime; String? updateUser; factory SignIn.fromJson(Map json) => _$SignInFromJson(json); Map toJson() => _$SignInToJson(this); }