我正在使用 RestKit 提取可能包含 child 评论的评论(这些 child 可能有 child 等)。

我能够毫无问题地深入提取 0 条评论。对于每个深度为 0 的评论，我都有一组评论对象。每个父评论都填充了正确数量的子评论，但是子评论中的所有属性都是零(只有深度为 0 的父评论填充了真实数据)。 RestKit 给我警告:

W restkit.object_mapping:RKMappingOperation.m:645 WARNING: Detected a relationship mapping for a collection containing another collection. This is probably not what you want. Consider using a KVC collection operator (such as @unionOfArrays) to flatten your mappable collection.
W restkit.object_mapping:RKMappingOperation.m:646 Key path 'comments.comments' yielded collection containing another collection rather than a collection of objects:

此外，对于我尝试映射到子项中的每个属性，我都会收到此消息(按属性类型更改)

E restkit.object_mapping:RKMappingOperation.m:440 Failed transformation of value at keyPath 'vote_count' to representation of type 'NSNumber': Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 "Failed transformation of value '( )' to NSNumber: none of the 2 value transformers consulted were successful." UserInfo=0x8e68280 {detailedErrors=( "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 \"The given value is not already an instance of 'NSNumber'\" UserInfo=0x8e681e0 {NSLocalizedDescription=The given value is not already an instance of 'NSNumber'}", "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3000 \"Expected an inputValue of type NSNull, but got a __NSArrayI.\" UserInfo=0x8e68210 {NSLocalizedDescription=Expected an inputValue of type NSNull, but got a __NSArrayI.}" ), NSLocalizedDescription=Failed transformation of value '( )' to NSNumber: none of the 2 value transformers consulted were successful.}

尽管有警告，但我相信这就是我想要的——但它在映射子对象方面遇到了困难。它提示说它在需要属性类型时“得到了一个 NSArray”，所以我假设我的属性映射不正确。

这是我的映射:

+ (RKMapping *) dnCommentMapping {
RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[DNComment class]];
[mapping addAttributeMappingsFromDictionary:@{
                                              @"id": @"commentId",
                                              @"body": @"body",
                                              @"body_html": @"bodyHTML",
                                              @"created_at": @"createdAt",
                                              @"depth": @"depth",
                                              @"vote_count": @"voteCount",
                                              @"user_id": @"userID",
                                              @"user_display_name": @"userDisplayName",
                                              }];
[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"comments.comments"
                                                                        toKeyPath:@"comments"
                                                                      withMapping:mapping]];

return mapping;
}

这是我的对象

@interface DNComment : NSObject
@property (nonatomic, assign) NSInteger commentId;
@property (nonatomic, copy) NSString *body;
@property (nonatomic, copy) NSString *bodyHTML;
@property (nonatomic, copy) NSDate *created_at;
@property (nonatomic, assign) NSInteger depth;
@property (nonatomic, assign) NSInteger voteCount;
@property (nonatomic, copy) NSDate *createdAt;
@property (nonatomic, assign) NSInteger userID;
@property (nonatomic, copy) NSString *userDisplayName;
@property (nonatomic, strong) NSArray *comments;
@end

我的 RKResponseDescriptor

RKMapping *mapping = [DNAMappingProvidor dnCommentMapping];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:mapping
                                                                                        method:RKRequestMethodGET
                                                                                   pathPattern:/api/v1/stories/1
                                                                                       keyPath:@"story.comments"
                                                                                   statusCodes:statusCodeSet];

您可以在图像中看到填充了深度 0 评论，它创建了正确数量的子项(并且他们的子项计数是正确的)，但它们没有被填充。

这是我尝试映射的 JSON 示例

{
"story": {
"badge": "discussion",
"comment": "THE STORY",
"comments": [
  {
    "body": "THIS IS MY COMMENT - I GET MAPPED FINE",
    "body_html": "<p>THIS IS MY COMMENT - I GET MAPPED FINE</p>\n",
    "comments": [
      {
        "body": "THIS IS MY CHILD RESPONSE - NONE OF MY PROPERTIES GET SET",
        "body_html": "<p>THIS IS MY CHILD RESPONSE - NONE OF MY PROPERTIES GET SET</p>\n",
        "comments": [
          {
            "body": "THIS IS MY CHILD'S CHILD RESPONSE - NONE OF MY PROPERTIES GET SET",
            "body_html": "<p>THIS IS MY CHILD'S CHILD RESPONSE - NONE OF MY PROPERTIES GET SET </p>\n",
            "comments": [

            ],
            "created_at": "2014-02-17T21:07:13Z",
            "depth": 2,
            "id": 41665,
            "url": "https://www.www.com",
            "user_display_name": "A M.",
            "user_id": 201,
            "user_job": "Job Title",
            "user_portrait_url": "image.png",
            "user_url": "user.com",
            "vote_count": 1
          }
        ],
        "created_at": "2014-02-17T20:50:05Z",
        "depth": 1,
        "id": 41655,
        "url": "https://www.www.com",
        "user_display_name": "M K.",
        "user_id": 3517,
        "user_job": "Job Title",
        "user_portrait_url": "image.png",
        "user_url": "user.com",
        "vote_count": 2
      }
    ],
    "created_at": "2014-02-17T20:14:47Z",
    "depth": 0,
    "id": 41649,
    "url": "www.www.com",
    "user_display_name": "A M.",
    "user_id": 201,
    "user_job": "Job Title",
    "user_portrait_url": "image.com",
    "user_url": "user.com",
    "vote_count": 32
  },

谢谢

最佳答案

看起来你的问题只是这一部分:

[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"comments.comments"

因为关键路径应该只是@"comments"。您无需深入了解结构，RestKit 会在导航应用映射的 JSON 时为您完成这项工作。

关于ios - RestKit 嵌套同类型对象 -- JSON 集合错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22240320/