Core data RestKit addConnectionForRelationship无法识别连接

我有一个RKEntityMapping对象，它将具有一对一关系的对象映射到子对象

调用以下代码时：

[sessionMapping addConnectionForRelationship:@“dailyGoalDetail”连接者：@{@“dailyGoalDetail”：@“dailyGoalDetail”}]；

通过addConnectionForRelationship方法进行调试，我看到添加到连接集合中的连接是nil。 我通过以下方式找到与核心数据的连接进行了双重检查：

NSEntityDescription*parentEntity=[NSEntityDescription entityForName:@“Session”在ManagedObjectContext:[MGRModel sharedModel].managedObjectStore.persistentStoreManagedObjectContext]中；
nsrrelationshipsdescription*childRelationship=[parentEntity relationshipsByName][@“dailygoaldeail”]；
[sessionMapping addConnectionForRelationship:childRelationship被连接者：@{“DailyGoaldtaild”：@“DailyGoaldtaild”}]；

登录到控制台我的关系显示了这一点。但是addConnectionForRelationship方法仍然将nil连接添加到其集合中

这个怎么了

更新

以下是我的会话对象的相关代码：

+ (RKEntityMapping *)responseMapping
{
    RKEntityMapping* sessionMapping = [RKEntityMapping mappingForEntityForName:@"Session" inManagedObjectStore:[[MGRModel sharedModel] managedObjectStore]];
    [sessionMapping addAttributeMappingsFromDictionary:@{
                                                         @"ActivityId": @"activityType",
                                                         @"DailyGoalDetailId": @"dailyGoalDetailId",
                                                         @"DeviceGuid": @"deviceId",
                                                         @"DeviceSessionId": @"entityId",
                                                         @"Frequency": @"frequency",
                                                         @"Pace": @"pace",
                                                         @"Start": @"start",
                                                         @"Stop": @"stop",
                                                         @"TotalBeats": @"totalBeats",
                                                         @"TotalKcal": @"totalCalories",
                                                         }];
    sessionMapping.identificationAttributes = @[ @"entityId" ];

    // Add relationship mapping with Measurement as "sessionDetails"
    [sessionMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"SessionDetails"
                                                                                   toKeyPath:@"sessionDetails"
                                                                                 withMapping:[MGRMeasurement responseMapping]]];

    NSEntityDescription *parentEntity = [NSEntityDescription entityForName:@"Session" inManagedObjectContext:[MGRModel sharedModel].managedObjectStore.persistentStoreManagedObjectContext];
    NSRelationshipDescription *childRelationship = [parentEntity relationshipsByName][@"dailyGoalDetail"];
    [sessionMapping addConnectionForRelationship:childRelationship connectedBy:@{@"dailyGoalDetailId":@"dailyGoalDetailId"}];

//    [sessionMapping addConnectionForRelationship:@"dailyGoalDetail" connectedBy:@{ @"dailyGoalDetailId": @"dailyGoalDetailId" }];

    return sessionMapping;
}

下面是这段关系的po：

(lldb) po childRelationship
(<NSRelationshipDescription: 0xc266570>), name dailyGoalDetail, isOptional 1, isTransient 0, entity Session, renamingIdentifier dailyGoalDetail, validation predicates (
), warnings (
), versionHashModifier (null)
 userInfo {
}, destination entity DailyGoalDetail, inverseRelationship sessions, minCount 0, maxCount 1, isOrdered 0, deleteRule 1

以及初始化和调用映射器的相关代码（这是通过NSString完成的）：

---

RKMapperOperation

实际上做不了多少工作。在内部，它使用

RKMappingOperation

，这就是连接的原因。要使其正常工作，您有两个选项：

使用2个相互依赖的实例，会话映射器以秒为单位运行

使用

RKObjectManager

监督整个过程

---

如果直接使用映射器操作，则需要其中的两个，以便可以显式控制顺序。理论上，您也可以将连接添加到两个映射上，因此，先运行哪一个并不重要（只要它们都由同一个MOC支持）。

显示如何登录的代码test@Wain我已经添加了您要求的信息。如果您需要更多信息，请告诉我。这样代码看起来就可以了。目前还不清楚哪些不起作用（创建映射或映射结果）。不清楚为什么要直接使用

rkmapperooperation

（而不是

RKObjectManager

）。您是否验证了

parsedData

是否确实包含您期望的内容？然后打开跟踪日志记录，看看它对关系的描述。@Wain我一直在使用

RKMapperOperation

，因为我一直在遵循那里的示例代码：-我无法粘贴日志，因为它是一个巨大的JSON。如果你想看看里面发生了什么，我可以把它放在dropbox上。据我所知，这种联系完全被忽视了。我尝试在子对象上添加一个连接，尽管连接尚未建立，但至少映射器说明了如何以这种方式评估连接。是否有可能我应该强制映射器先使用DailyGoalDetails数组，然后仅在映射该数组之后才使用该数组，处理UserSessions数组以便它可以找到相关数据？

{
  "DailyGoalDetails": [
    {
      "DailyGoal": {
        "ActivityUnit": {
          "ActivityUnitId": 1,
          "Name": "BEATS"
        },
        "DailyGoalId": 1,
        "ActivityUnitId": 1,
        "Name": "Un inizio facile",
        "Beats": 25,
        "Level": 1
      },
      "DailyGoalDetailId": 6,
      "DailyGoalId": 1,
      "UserId": "7a2e5b7c-9a3a-4ad1-ad79-946bcf2bf2f3",
      "Hit": true,
      "Value": 9,
      "GoalDate": "2014-04-16T00:00:00",
      "AvgActivityTime": 12
    }
  ],
  "UserSessions": [
    {
      "UserSessionId": 0,
      "DeviceGuid": "962d26a01cdef0c8",
      "DeviceSessionId": "2a0bb7a0-041d-4df6-abcb-e50483858cba",
      "DailyGoalId": 1,
      "DailyGoalDetailId": 6,
      "ActivityId": 1,
      "Start": "2014-04-16T16:10:11",
      "Stop": "2014-04-16T16:15:53",
      "TotalBeats": 0,
      "TotalKcal": 1,
      "Pace": 0.00,
      "Frequency": 1,
      "SessionDetails": [
        {
          "Speed": 0.0,
          "Step": 4,
          "Distance": 0.0,
          "Beats": 0.0033395835198462009,
          "Lat": 45.70608193,
          "Lng": 9.70917967,
          "Altitude": 298.0,
          "Orientation": 0.0,
          "Start": "2014-04-16T16:10:10",
          "Stop": "2014-04-16T16:10:11"
        },
        {
          "Speed": 0.0,
          "Step": 2,
          "Distance": 0.0,
          "Beats": 0.0033395835198462009,
          "Lat": 45.70608193,
          "Lng": 9.70917967,
          "Altitude": 298.0,
          "Orientation": 0.0,
          "Start": "2014-04-16T16:10:11",
          "Stop": "2014-04-16T16:10:12"
        },
      ]
    }
  ]
}

        // Json decoding
        NSError *decodingError = nil;
        id parsedData = [RKMIMETypeSerialization objectFromData:decodedUncompressedData MIMEType:RKMIMETypeJSON error:&decodingError];
        if (parsedData == nil && error) {
            NSLog(@"Error decoding json received from synchronization");
        }
        NSMutableDictionary *mappingsDictionary = [[NSMutableDictionary alloc] init];
        // Add DailyGoalDetails->MGRDailyGoalDetail mapping
        [mappingsDictionary setObject:[MGRDailyGoalDetail responseMapping] forKey:@"DailyGoalDetails"];
        // Add UserSessions->MGRSession mapping
        [mappingsDictionary setObject:[MGRSession responseMapping] forKey:@"UserSessions"];
        RKMapperOperation *mapper = [[RKMapperOperation alloc] initWithRepresentation:parsedData mappingsDictionary:mappingsDictionary];
        RKManagedObjectMappingOperationDataSource *dataSource = [[RKManagedObjectMappingOperationDataSource alloc] initWithManagedObjectContext:[MGRModel sharedModel].managedObjectStore.persistentStoreManagedObjectContext cache:[MGRModel sharedModel].managedObjectStore.managedObjectCache];
        dataSource.parentOperation = mapper;
        mapper.mappingOperationDataSource = dataSource;
        NSError *mappingError = nil;
        BOOL isMapped = [mapper execute:&mappingError];
        if (isMapped && !mappingError) {
            NSLog(@"jsonMappingResult = %@",[mapper mappingResult]);
            [[[[MGRModel sharedModel] managedObjectStore] persistentStoreManagedObjectContext] save:&mappingError];
        }