Restkit - 关系映射不起作用

Question

我正在体验 Restkit，使用版本 0.25.0。我完全按照文档中有关关系映射的说明进行操作，但由于某些原因，我的映射结果为空！ 但是当我删除关系对象（数据）时，我有一个映射结果！！！但当然，映射结果不包含我需要的数据，即我添加为关系的数据。 我按照他们在此链接中的示例进行操作：
https://github.com/RestKit/RestKit/wiki/Object-mapping#relationships

当我使用调试器打印 JSON 时，输出如下：

{
   "status": "success",
   "data": {
       "id": 11,
       "provider": "email",
       "uid": "riri@gmail.com",
       "name": null,
       "nickname": null,
       "image": null,
       "email": "riri@gmail.com",
       "country": "United States",
       "city": "Milan, Metropolitan City of Milan, Italy",
       "gender": "m",
       "birthday": "2015-06-25"
   }
}

这是我提出请求的代码：

RKObjectManager *manager = [RKObjectManager sharedManager];

RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

RKObjectMapping *jsonResponseMapping = [JSONResponse mappingObject];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:jsonResponseMapping
                                                                                        method:RKRequestMethodAny
                                                                                   pathPattern:@"/auth/sign_in"
                                                                                       keyPath:nil
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[manager addResponseDescriptor:responseDescriptor];

NSDictionary *parameters = @{
                             @"email": user.email,
                             @"password": user.password
                             };
[manager postObject:user path:@"/auth/sign_in" parameters:parameters success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSDictionary *headerFields = operation.HTTPRequestOperation.response.allHeaderFields;
    [self updateUserInfoForResponse:[mappingResult firstObject] headerFields:headerFields];
    if (successBlock) {

        successBlock([mappingResult firstObject]);
    }
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    if (failureBlock) {
        failureBlock(error.userInfo[RKObjectMapperErrorObjectsKey][0], error);
    }
}];

.m JSONResponse 类：

+ (RKObjectMapping *)mappingObject {
    RKObjectMapping *jsonResponseMapping = [RKObjectMapping mappingForClass:[JSONResponse class]];
    [jsonResponseMapping addAttributeMappingsFromDictionary:@{
                                                  @"status": @"status",
                                                  @"errors": @"errors",
                                                  }];

    RKRelationshipMapping *userRelationShip = [RKRelationshipMapping relationshipMappingFromKeyPath:@"data" toKeyPath:@"data" withMapping:[User mappingObject]];
    [jsonResponseMapping addPropertyMapping:userRelationShip];

    return jsonResponseMapping;
}

.h JSONResponse 类：

#import <RestKit/Restkit.h>
#import <Foundation/Foundation.h>
#import "User.h"

@interface JSONResponse : NSObject

@property (nonatomic, copy) NSString *status;
@property (nonatomic) User *data;
@property (nonatomic, copy) NSDictionary *errors;

/**
 @function mappingObject

 @return RKObjectMapping mapping for the json response
 */
+ (RKObjectMapping *)mappingObject;

@end

用户类的.m

#import "User.h"

@implementation User

+ (RKObjectMapping *)mappingObject {
    RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[User class]];
    [userMapping addAttributeMappingsFromDictionary:@{
                                                  @"email": @"email",
                                                  @"password": @"password",
                                                  @"gender": @"gender",
                                                  @"birthday": @"dateOfBirth",
                                                  @"city": @"city",
                                                  @"country": @"country"
                                                  }];
    return userMapping;
}

@end

用户类的.h

@class RKObjectMapping;

@interface User : NSObject

@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *password;
@property (nonatomic, copy) NSString *gender;
@property (nonatomic, copy) NSString *dateOfBirth;
@property (nonatomic, copy) NSString *city;
@property (nonatomic, copy) NSString *country;

/**
    @function mappingObject

    @return RKObjectMapping mapping object for user
 */
+ (RKObjectMapping *)mappingObject;

@end

我的模型对象有什么问题吗？关系设置正确吗？我在 JSONResponse 中有 data 属性，并且 JSON 正确包含 keyPath data。 所以我很困惑为什么当我删除我的关系时我有结果，为什么当我有关系时映射结果是空的。甚至没有进入failureCallback，操作成功，结果为空。

有什么想法吗？？

编辑： 这是日志：

2015-09-15 07:27:50.649 testRestkit[53698:3448725] D restkit.object_mapping:RKPropertyInspector.m:154 Cached property inspection for Class 'JSONResponse': {
    data = "<RKPropertyInspectorPropertyInfo: 0x7facf2c5fa00>";
    status = "<RKPropertyInspectorPropertyInfo: 0x7facf2c5f7d0>";
}
2015-09-15 07:27:50.650 testRestkit[53698:3448725] D restkit.object_mapping:RKPropertyInspector.m:154 Cached property inspection for Class 'User': {
    email = "<RKPropertyInspectorPropertyInfo: 0x7facf2c60680>";
}
2015-09-15 07:27:50.820 testRestkit[53698:3448725] I restkit.network:RKObjectRequestOperation.m:150 POST 'http://sandrotchikovani.com/test.php'
2015-09-15 07:27:51.236 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:407 Executing mapping operation for representation: {
    data =     {
        email = "lol@gmail.com";
    };
    status = success;
}
 and targetObject: <User: 0x7facf2c05820>
2015-09-15 07:27:51.237 testRestkit[53698:3448938] T restkit.object_mapping:RKMapperOperation.m:350 Examining keyPath '<null>' for mappable content...
2015-09-15 07:27:51.237 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:330 Found mappable data at keyPath '<null>': {
    data =     {
        email = "lol@gmail.com";
    };
    status = success;
}
2015-09-15 07:27:51.237 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:433 Finished performing object mapping. Results: {
}

日志中写着and targetObject: <User: 0x7facf2c05820> 是不是很奇怪？当我删除关系时，有一个映射结果和targetObject，显示“null”。

Answer 1

您正在调用postObject:...，当您这样做时，RestKit 将映射回原始对象。在这种情况下，这是一个用户，这就是您看到日志 and targetObject: <User: 0x7facf2c05820> 的原因。

对您来说最简单的事情是设置您的JSONResponse，以便您发布并接收回复。它已经具有所需的user，因此对请求描述符进行简单更改以提取用户字段就足够了。

另外还有一堆关于在发布后映射到不同对象的其他问题。