iOS RestKit - 映射结果，只有一个属性

Question

这是我对 API 的回应：

{"is_favorited":1}

我想通过 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。我在地址中有令牌。我是这样称呼它的：

    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)
              {
              ...
              }];

我在应用程序和 sid（登录令牌）中多次使用 RestKit。所以地址和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。我尝试将 keyPath 从 nil 更改为 @"is_favorited" 但没有帮助。

我的 Is_favorite.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 发生更改但仍无法正常工作：

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

删除你对addAttributeMappingsFromDictionary:的使用，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 nil 键路径映射（因为映射中的源键路径为 nil）。