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我正在尝试使用以下代码创建 LBUser 的用户扩展并将其保存到服务器：

LBRESTAdapter *adapter = ((AppDelegate *)[[UIApplication sharedApplication] delegate]).adapter;
    if (adapter) {
        TeacherRepository *repo = (TeacherRepository *)[adapter repositoryWithClass:[TeacherRepository class]];
        if (repo) {
            Teacher *st = (Teacher *)[repo createUserWithEmail:@"test@test.com" password:@"test"];
            st.bigarea = @"Mathematics";
            NSLog(@"Email: %@", st.email);
            NSLog(@"Password: %@", st.password);
            if (st) {
                [st saveWithSuccess:^{
                    NSLog(@"Saved in server!");
                } failure:^(NSError *error) {
                    NSLog(@"Error: %@", error);
                }];
            }
        }
    }

TeacherRepository 是一个 LBUserRepository 扩展。显然用户的创建是好的，但是当我尝试保存用户时，我得到了这个错误：

Error Domain=AFNetworkingErrorDomain Code=-1011 "Expected status code in (200-299), got 422" UserInfo=0x7f9418f07db0 {NSLocalizedRecoverySuggestion={"error":{"name":"ValidationError","status":422,"message":"The `Teacher` instance is not valid. Details: `password` can't be blank; `email` can't be blank; `email` is blank.","statusCode":422,"details":{"context":"Teacher","codes":{"password":["presence"],"email":["presence","format.blank"]},"messages":{"password":["can't be blank"],"email":["can't be blank","is blank"]}},"stack":"ValidationError: The `Teacher` instance is not valid. Details: `password` can't be blank; `email` can't be blank; `email` is blank.

似乎我的名为 Teacher 的 LBUser 扩展名无效，并且电子邮件和密码为空白，但根据 NSLog，它们不是空白的。这是Teacher.h：

#import <Foundation/Foundation.h>
#import <LoopBack/LoopBack.h>

@interface Teacher : LBUser

@property (strong,nonatomic) NSString *bigarea;

@end

回到服务器，我有一个 .json 将老师描述为：

{
  "name": "Teacher",
  "plural": "Teachers",
  "base": "User",
  "properties": {
    "bigarea": {
      "type": "string",
      "required": true
    }
  },
  "validations": [],
  "relations": {
    "courses": {
      "type": "hasMany",
      "model": "Course",
      "foreignKey": "courseId"
    }
  },
  "acls": [],
  "methods": []
}

此外，我对如何表示 Objective C 中的关系感到有些困惑。有人可以给我一点启示吗？

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