ios7 - RESTKit:在搜索的关键路径中找不到可映射的对象表示

Question

日志:

2014-04-09 15:03:10.196 App[49808:60b] request <NSMutableURLRequest: 0xd091170> { URL: http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z }
2014-04-09 15:03:10.214 App[49808:60b] I restkit.network:RKObjectRequestOperation.m:180 GET 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z'
2014-04-09 15:03:10.300 App[49808:632f] D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: {
    meetups =     (
                {
            activities =             (
                                {
                    activityId = 37;
                    activityType = "<null>";
                    customData = "<null>";
                    locationAddress = "k2-LocationAddress";
                    locationName = "k2-LocationName";
                    startTime = "0000-00-00 00:00:00";
                },
                                {
                    activityId = 38;
                    activityType = "<null>";
                    customData = "<null>";
                    locationAddress = "k-LocationAddress";
                    locationName = "k-LocationName";
                    startTime = "0000-00-00 00:00:00";
                }
            );
            comment = comment;
            gettingBack = "gettingBack Test";
            gettingThere = "gettingBack Test";
            meetingType = 1;
            meetupId = 65;
            modified = "2014-04-09T20:59:29.000Z";
            ownerId = Joe;
            recipientId = "<null>";
        }
    );
}
 and targetObject: (null)
2014-04-09 15:03:10.301 App[49808:632f] D restkit.object_mapping:RKMapperOperation.m:403 Finished performing object mapping. Results: (null)
2014-04-09 15:03:10.302 App[49808:21f] E restkit.network:RKObjectRequestOperation.m:243 GET 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z' (200 OK / 0 objects) [request=0.0849s mapping=0.0000s total=0.1043s]: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No response descriptors match the response loaded." UserInfo=0xd0b5a40 {NSErrorFailingURLStringKey=http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z, NSLocalizedFailureReason=A 200 response was loaded from the URL 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z', which failed to match all (0) response descriptors:, NSLocalizedDescription=No response descriptors match the response loaded., keyPath=null, NSErrorFailingURLKey=http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z, NSUnderlyingError=0xd08a190 "No mappable object representations were found at the key paths searched."}

代码:

@property (strong, nonatomic) RKObjectManager *objectManager;
....

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
self.objectManager = [self getObjectManager];

self.objectManager.managedObjectStore = [appDelegate setupCoreDataWithRESTKit];

[RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;

RKEntityMapping *invitationMapping = [RKEntityMapping mappingForEntityForName:@"Invite" inManagedObjectStore:self.objectManager.managedObjectStore];
[invitationMapping addAttributeMappingsFromDictionary:@{
                                                        @"recipientId" : @"recipientId",
                                                        @"meetingType" : @"meetingType",
                                                        @"startDate" : @"startDate",
                                                        @"gettingThere" : @"gettingThere",
                                                        @"gettingBack" : @"gettingBack",
                                                        @"comment" : @"comment"
                                                        }];
invitationMapping.identificationAttributes = @[@"meetupId"];

RKEntityMapping *activityMapping = [RKEntityMapping mappingForEntityForName:@"Activity" inManagedObjectStore:self.objectManager.managedObjectStore];
[activityMapping addAttributeMappingsFromDictionary:@{
                                                      @"locationName" : @"locationName",
                                                      @"locationAddress" : @"locationAddress",
                                                      @"startTime" : @"startTime",
                                                      @"customData" : @"customData"
                                                      }];
activityMapping.identificationAttributes = @[@"activityId"];
NSIndexSet *statusCodeSet = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);

[invitationMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"activities" toKeyPath:@"activities" withMapping:activityMapping]];


RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:invitationMapping
                                                                                        method:RKRequestMethodGET
                                                                                   pathPattern:@"/meetups"
                                                                                       keyPath:@"meetups" statusCodes:statusCodeSet];


NSMutableURLRequest *request = [self.objectManager.HTTPClient requestWithMethod:@"GET"
                                                                           path:@"/meetups"
                                                                     parameters:@{@"lastrequest": dateString

                                                                                  }];

 [self.objectManager.HTTPClient  registerHTTPOperationClass:[AFHTTPRequestOperation class]];

RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc]initWithRequest:request responseDescriptors:@[responseDescriptor]];

operation = [self.objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:self.objectManager.managedObjectStore.mainQueueManagedObjectContext success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSArray *array = mappingResult.array;
    NSLog(@"array %@", array);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

[operation start];
}

Invite 与名为 activities 的 Activity 有一对多关系。

为什么我得到:“在搜索的关键路径上找不到可映射的对象表示。” ？

Answer 1

这是创建操作的正确方法:

RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc]initWithRequest:request responseDescriptors:@[responseDescriptor]];

但随后您将那个替换为另一个创建的:

operation = [self.objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:self.objectManager.managedObjectStore.mainQueueManagedObjectContext success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {

正确使用对象管理器。这个问题是你没有把响应描述符给对象管理器，你只把它给了刚刚销毁的操作(因为你替换了它)。

因此，使用您创建的第一个操作，并通过调用 setCompletionBlockWithSuccess:failure: 在其上设置成功和失败 block 。