登录逻辑

lib/models/user_info_model.dart

@@ -7,14 +7,14 @@ class UserInfoModel {
     required this.address,
   });
 
-  int userId;
+  String userId;
   String username;
-  String nickname;
-  String avatar;
+  String? nickname;
+  String? avatar;
   String? address;
 
   factory UserInfoModel.fromJson(Map<String, dynamic> json) => UserInfoModel(
-        userId: json['user_id'],
+        userId: json['user_id'].toString(),
         username: json['username'],
         nickname: json['nickname'],
         avatar: json['avatar'],
@@ -22,10 +22,18 @@ class UserInfoModel {
       );
 
   factory UserInfoModel.empty() => UserInfoModel(
-        userId: 0,
+        userId: '',
         username: '',
         nickname: '',
         avatar: '',
         address: '',
       );
+
+  Map<String, dynamic> toJson() => {
+        "userId": userId,
+        "username": username,
+        "nickname": nickname,
+        "avatar": avatar,
+        "address": address,
+      };
 }