Ios restkit0.2的结果是一个nil对象数组，尽管映射似乎是成功的

我目前正试图使RestKit 0.20与我当前的项目一起运行，我遇到了一些困难

我尝试将我的请求映射到一个对象，它显然是映射，但结果只返回空对象

希望你们知道该怎么做

这是密码

// Create object mapping for MVMyCar
  RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[MVMyCar class]];
  [mapping addAttributeMappingsFromDictionary:@{
                                                @"my_car_id"        :   @"uuid"
                                                }];

  // ResponseDescriptor
  RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:mapping
                                                                                          method:RKRequestMethodGET
                                                                                     pathPattern:kAPIPathGarage
                                                                                         keyPath:@"result"
                                                                                     statusCodes:[NSIndexSet indexSetWithIndex:200]];
  [[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];

  [RKObjectManager.sharedManager getObjectsAtPath:kAPIPathGarage parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"Mapping: %@",[mappingResult array]);
  } failure:^(RKObjectRequestOperation *operation, NSError *error) {

  }];

这是restkit跟踪：

2013-07-18 18:32:01.566 [12722:3a07] T restkit.object_mapping:RKMappingOperation.m:953 Performing mapping operation: <RKMappingOperation 0xc2920b0> for 'MVMyCar' object. Mapping values from object {
    "my_car_id" = 76;
} to object *nil description* with object mapping (null)
2013-07-18 18:32:01.569 [12722:3a07] T restkit.object_mapping:RKMappingOperation.m:550 Mapping attribute value keyPath 'my_car_id' to 'uuid'
2013-07-18 18:32:01.572 [12722:3a07] T restkit.object_mapping:RKMappingOperation.m:431 Found transformable value at keyPath 'my_car_id'. Transforming from type '__NSCFString' to 'NSNumber'
2013-07-18 18:32:01.573 [12722:3a07] T restkit.object_mapping:RKMappingOperation.m:572 Mapped attribute value from keyPath 'my_car_id' to 'uuid'. Value: 76
2013-07-18 18:32:01.574 [12722:3a07] D restkit.object_mapping:RKMappingOperation.m:1021 Finished mapping operation successfully...

---

非常感谢

Ok发现了错误。老实说，这很愚蠢：

我在映射对象中有一个名为“description”的属性

---

有时，我们看不见树木的树木。

我想知道这是否与“对象映射为零的描述（空）”有关

2013-07-18 18:32:01.575 [12722:3a07] D restkit.object_mapping:RKMapperOperation.m:403 Finished performing object mapping. Results: {
    result =     (
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null),
        (null)
    );
}