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我在使用 RESTKIT 并通过 RESTKit .20.1 映射以下 JSON 时遇到问题。我有一个嵌套的 JSON 数组，我正在尝试通过关系映射器进行映射。我能够成功映射 5 个 chart_data 对象，但相关的嵌套 chart_datatum 对象没有映射到 ChartDataDetails 类。所有属性都是空白的。

我想要以下对象结构。

警报实例

      ChartData 对象数组

          每个 ChartData 对象应包含 1 个 ChartDataDetails 对象 <---- 此对象为空白

有关当前状态的 XCode 调试器屏幕截图，请参阅底部的链接。

有人可以提供一些帮助吗？

谢谢，G

{
    "alert_instance": {
    "alert_template_id": 1,
    "alert_time_period": "2013-05-29",
    "chart_data": [
        {
            "chart_datum": {
                "alert_instance_id": 1,
                "chart_data_id": 1,
                "chart_data_name": "provider_id",
                "datatype": 1,
                "chart_data_value": "1"
            }
        },
        {
            "chart_datum": {
                "alert_instance_id": 1,
                "chart_data_id": 1,
                "chart_data_name": "Provider_name",
                "datatype": 2,
                "chart_data_value": "Stubbs, Drew"
            }
        },
        {
            "chart_datum": {
                "alert_instance_id": 1,
                "chart_data_id": 1,
                "chart_data_name": "Posting_date",
                "datatype": 3,
                "chart_data_value": "05/12/2013"
            }
        },
        {
            "chart_datum": {
                "alert_instance_id": 1,
                "chart_data_id": 1,
                "chart_data_name": "Charges",
                "datatype": 5,
                "chart_data_value": "229"
            }
        },
        {
            "chart_datum": {
                "alert_instance_id": 1,
                "chart_data_id": 1,
                "chart_data_name": "Payments",
                "datatype": 5,
                "chart_data_value": "-1023.11"
            }
        }
    ]
}

模型类

警报实例.h

@interface AlertInstance : NSObject

@property  (nonatomic, copy) NSNumber* alertTemplateId;
@property  (nonatomic, copy) NSDate* alertTimePeriod;
@property  (nonatomic, retain) NSMutableArray* chartData;

@end

图表数据.h

@interface ChartData : NSObject

@property  (nonatomic, retain) ChartDataDetails *chartDataDetails;

@end

ChartDataDetails.h

@interface ChartDataDetails : NSObject

@property  (nonatomic, copy) NSNumber* chartDataId;
@property  (nonatomic, copy) NSString* chartDataName;
@property  (nonatomic, copy) NSNumber* chartDataType;
@property  (nonatomic, copy) NSNumber* chartDataValue;

@end

映射代码..

RKObjectMapping* chartDataDetailMapping = [RKObjectMapping mappingForClass:[ChartDataDetails class]];

[chartDataDetailMapping addAttributeMappingsFromDictionary:@{
     @"chart_data_id": @"chartDataId",
     @"chart_data_name": @"chartDataName",
     @"datatype": @"chartDataType",
     @"chart_data_value": @"chartDataValue",
 }];

RKObjectMapping* chartDataMapping = [RKObjectMapping mappingForClass:[ChartData class]];
[chartDataMapping addAttributeMappingsFromDictionary:@{
     @"chart_data":@"chartData"}];

RKObjectMapping* alertInstanceMapping = [RKObjectMapping mappingForClass:[AlertInstance class]];
[alertInstanceMapping addAttributeMappingsFromDictionary:@{
     @"alert_template_id": @"alertTemplateId",
     @"alert_time_period": @"alertTimePeriod",
 }];

[alertInstanceMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"chart_data"
                                                                                    toKeyPath:@"chartData"
                                                                                 withMapping:chartDataMapping]];

[alertInstanceMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"chart_datum"
                                                                                      toKeyPath:@"chartDataDetails"
                                                                                     withMapping:chartDataDetailMapping]];

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:alertInstanceMapping
                                                                                   pathPattern:nil
                                                                                       keyPath:@"alert_instance"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

NSURL *URL = [NSURL URLWithString:@"http://ideainnovationsmobiledev1.cloudapp.net:3000/alert_instances/1.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
RKObjectRequestOperation *objectRequestOperation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[ responseDescriptor ]];

[objectRequestOperation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult)

链接到调试器的屏幕截图

https://docs.google.com/file/d/0Bwaj6O1rXiKaeFIwT2s4Rm1Gb00/edit?usp=sharing

编辑：

好的，我想通了。

我需要将 ChartDetailsMapping 链接到 ChartData，如下所示。

[chartDataMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"chart_datum"
                                                                                 toKeyPath:@"chartDataDetails"
                                                                                 withMapping:chartDataDetailMapping]];

[alertInstanceMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"chart_data"
                                                                                     toKeyPath:@"chartData"
                                                                                   withMapping:chartDataMapping]];
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