iOS RestKit - 映射结果，只有一个属性

Question

这是我对 API 的回应:

{"is_favorited":1}

我想用 RestKit 映射它，但我无法让它工作。这是我在 AppDelegate.m 中的:

RKObjectMapping *isFavoriteMapping = [RKObjectMapping mappingForClass:[IsFavorite class]];
[isFavoriteMapping addAttributeMappingsFromDictionary:@{
                                                         @"is_favorited" : @"Is_favorited",
                                                         }];

RKResponseDescriptor *isFavoriteResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:isFavoriteMapping
                                                                                                  method:RKRequestMethodAny
                                                                                             pathPattern:@"/api/isPointFavorited/:sid"
                                                                                                 keyPath:nil
                                                                                             statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[manager addResponseDescriptor:isFavoriteResponseDescriptor];

路径没问题。我在地址中有 token 。我通过以下方式调用它:

    RKObjectManager *manager = [RKObjectManager sharedManager];
    [manager getObjectsAtPath: [NSString stringWithFormat:@"/api/isPointFavorited/%@", sid]
                   parameters:@{
                                @"pid":[NSString stringWithFormat:@"%@", actualPlace.Id]
                                }
                      success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult)
     {
      ...
      }
           failure:^(RKObjectRequestOperation *operation, NSError *error)
              {
              ...
              }];

我在应用程序中多次使用 RestKit，也使用 sid(登录 token )。所以地址或方法调用都没有问题。问题一定出在映射中，但我不知道该怎么做。我试图将 keyPath 从 nil 更改为 @"is_favorited"但它没有帮助。

我的最爱.h:

@interface IsFavorite : NSObject

@property(nonatomic) NSNumber *Is_favorited;

@end

RestKit 错误:

Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No mappable object representations were found at the key paths searched." UserInfo=0x1849cbc0 {DetailedErrors=(
), NSLocalizedFailureReason=The mapping operation was unable to find any nested object representations at the key paths searched: events, results
The representation inputted to the mapper was found to contain nested object representations at the following key paths: is_favorited
This likely indicates that you have misconfigured the key paths for your mappings., NSLocalizedDescription=No mappable object representations were found at the key paths searched., keyPath=null}

编辑 - AppDelegate 中的更改但仍然不起作用:

RKObjectMapping *isFavoriteMapping = [RKObjectMapping mappingForClass:[IsFavorite class]];
[isFavoriteMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"Is_favorited"]];

RKResponseDescriptor *isFavoriteResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:isFavoriteMapping
                                                                                                  method:RKRequestMethodAny
                                                                                             pathPattern:@"/api/isPointFavorited/:sid"
                                                                                                 keyPath:@"is_favorited"
                                                                                             statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[manager addResponseDescriptor:isFavoriteResponseDescriptor];

Answer 1

删除 addAttributeMappingsFromDictionary: 的使用，并更改为:

[isFavoriteMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"Is_favorited"]];

然后将响应描述符上的 keyPath 更改为 @"is_favorited"。

这称为零键路径映射(因为映射中的零源键路径)。