RESTKit null json response

Question

使用RESTKit我正在发出一个接收对象的GET请求，但有时服务器会返回一个字面上的响应＆＃34; null＆＃34;如果数据库中没有记录，则没有对象。该请求失败，其中包含＆＃34;已加载的无法处理的响应（200），内容类型为＆application; / json＆＃39;＆＃34;因为它无法映射＆＃34; null＆＃34;响应一个对象，但我希望请求成功，只返回一个nil对象。以下是我发出GET请求的方式：

NSDictionary *objMapping = @{
                             @"PROPERTY": @"property",
                            };

RKObjectMapping *myMapping = [RKObjectMapping mappingForClass:[MyClass class]];
[myMapping addAttributeMappingsFromDictionary:objMapping];


RKObjectManager* objectManager = [RKObjectManager sharedManager];

NSString *methodURL = [NSString stringWithFormat:@"%@/MyMethod", basePath];

NSURLRequest *request = [objectManager requestWithObject:nil method:RKRequestMethodGET path:methodURL parameters:@{@"myParam": myParamValue}];

NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); 
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:myMapping method:RKRequestMethodGET pathPattern:nil keyPath:nil statusCodes:statusCodes];

RKObjectRequestOperation *objectRequestOperation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[ responseDescriptor ]];

[objectRequestOperation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult)
 {
     MyClass *myObj = [mappingResult firstObject];


     if (success)
     {
         success(myObj);
     }
 } failure:^(RKObjectRequestOperation *operation, NSError *error) {
     if(failure)
     {
         failure(error);
     }
 }];

[[RKObjectManager sharedManager] enqueueObjectRequestOperation:objectRequestOperation];