JSON 格式不一致 [英] JSON format inconsistency

问题描述

我遇到过两种 JSON 格式:

格式 A:

<预><代码>[{话题":{"category":"testCategory","created_at":"2011-09-27T05:41:42Z",大小":5，标题":testTitle2"，id":1，帖子":[{"number":1,"created_at":"2011-09-27T05:41:42Z","text":"text2","id":1,"topic_id":1},{"number":0,"created_at":"2011-09-27T05:41:42Z","text":"sentence1","id":2,"story_id":1}]}}]

格式 B:

<预><代码>[{"category":"testCategory","created_at":"2011-09-27T05:41:42Z",大小":5，标题":testTitle2"，id":1，帖子":[{"number":1,"created_at":"2011-09-27T05:41:42Z","text":"text2","id":1,"topic_id":1},{"number":0,"created_at":"2011-09-27T05:41:42Z","text":"sentence1","id":2,"story_id":1}]}]

当我的 restKit 客户端获得格式 B 时，她很高兴，但是当她获得格式 A 时，我收到以下错误:

 ... 找不到 keyPath 的对象映射:'' ...

我的 restKit 配置在底部.

所以我通过让我的 rails 3.1 服务器向她发送格式 B JSON 来修复它.

但是现在，restKit 向服务器发送了一个格式为 A JSON 的数据，而他本该如此.

为什么restKit不会接收格式A而是发送格式A?有没有办法让restKit发送格式B JSON?或者，也许有办法让 rails 发送格式 B 并接收格式 A?

我的 restKit 配置:

-(void)initRestKit{RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURL:@"http://localhost:3000/"];objectManager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"WTF.sqlite"];//设置我们的对象映射RKManagedObjectMapping* topicMapping = [RKManagedObjectMapping mappingForClass:[Topic class]];storyMapping.primaryKeyAttribute = @"topicID";storyMapping.setDefaultValueForMissingAttributes = YES;[storyMapping mapKeyPathsToAttributes:@"id", @"topicID",....@"created_at", @"dateCreated", nil];RKManagedObjectMapping* postMapping = [RKManagedObjectMapping mappingForClass:[Post class]];句子Mapping.primaryKeyAttribute = @"postID";[sentencesMapping mapKeyPathsToAttributes:@"id", @"postID",...@"text", @"text", nil];//设置关系[storyMapping mapRelationship:@"posts" withMapping:postMapping];//话题->(帖子)->邮政//向提供者注册我们的映射[objectManager.mappingProvider setMapping:topicMapping forKeyPath:@"topic"];[objectManager.mappingProvider setMapping:postMapping forKeyPath:@"post"];//设置路由器[objectManager.router routeClass:[Topic class] toResourcePath:@"/topics.json" forMethod:RKRequestMethodPOST];[objectManager.router routeClass:[主题类] toResourcePath:@"/topics/(topicID).json"];[objectManager.router routeClass:[Post class] toResourcePath:@"/topics/(topic.topicID)/posts.json" forMethod:RKRequestMethodPOST];[objectManager.router routeClass:[Post class] toResourcePath:@"/topics/(topic.topicID)/(post.postID).json"];}-(void)sendTopic{RKObjectManager *manager =[RKObjectManager sharedManager];[manager postObject:self.topic delegate:nil block:^(RKObjectLoader *loader) {RKObjectMapping* sendTopicMapping = [RKManagedObjectMapping mappingForClass:[主题类]];[sendTopicMapping mapKeyPathsToAttributes:@"id", @"topicID",....@"title", @"title", nil];RKManagedObjectMapping* postPostMapping = [RKManagedObjectMapping mappingForClass:[Post class]];[postPostMapping mapKeyPathsToAttributes:@"id", @"postID",....@"text", @"text", nil];[sendTopicMapping mapRelationship:@"posts" withMapping:postPostMapping];[manager.mappingProvider setMapping:sendTopicMapping forKeyPath:@"topic"];loader.serializationMapping = [sendTopicMapping inverseMapping];}];}

解决方案

如果有人感兴趣，我解决了:

在 rails 中，我更改了模型，因此它将像这样发送 restKit 客户端嵌套的 json(格式 A):

class 主题 <ActiveRecord::Basehas_many : 帖子accepts_nested_attributes_for :postsself.include_root_in_json = true结尾

我将 post 方法属性嵌套如下:

-(void)sendTopic{RKObjectManager *manager =[RKObjectManager sharedManager];[manager postObject:self.topic delegate:nil block:^(RKObjectLoader *loader) {RKObjectMapping* sendTopicMapping = [RKManagedObjectMapping mappingForClass:[主题类]];[sendTopicMapping mapKeyPathsToAttributes:@"topic[id]", @"topicID",....@"topic[title]", @"title", nil];RKManagedObjectMapping* postPostMapping = [RKManagedObjectMapping mappingForClass:[Post class]];[postPostMapping mapKeyPathsToAttributes:@"post[id]", @"postID",....@"post[text]", @"text", nil];[sendTopicMapping mapRelationship:@"posts" withMapping:postPostMapping];[manager.mappingProvider setMapping:sendTopicMapping forKeyPath:@"topic"];loader.serializationMapping = [sendTopicMapping inverseMapping];}];}

There are two JSON format that i came across:

Format A:

[
  {"topic":
    {"category":"testCategory","created_at":"2011-09-27T05:41:42Z",
     "size":5,"title":"testTitle2", "id":1,
     "posts":[
               {"number":1,"created_at":"2011-09-27T05:41:42Z",
                "text":"text2","id":1,"topic_id":1},
               {"number":0,"created_at":"2011-09-27T05:41:42Z",
                "text":"sentence1","id":2,"story_id":1}
             ]
     }
  }
]

Format B:

[
    {"category":"testCategory","created_at":"2011-09-27T05:41:42Z",
     "size":5,"title":"testTitle2", "id":1,
     "posts":[
               {"number":1,"created_at":"2011-09-27T05:41:42Z",
                "text":"text2","id":1,"topic_id":1},
               {"number":0,"created_at":"2011-09-27T05:41:42Z",
                "text":"sentence1","id":2,"story_id":1}
             ]
     }
]

When my restKit client gets format B she is pleased but when she gets format A i get the following error:

 ... Could not find an object mapping for keyPath: '' ...

My restKit configurations is at the bottom.

So i fixed it by making my rails 3.1 server send her a format B JSON.

But now, restKit sends the server a format A JSON and he is stump as he should be.

Why does restKit won't receive format A but sends formats A? Is there a way to make restKit send a format B JSON? Or, maybe is there a way to make rails send format B and receive format A?

my restKit configurations:

-(void)initRestKit{
RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURL:@"http://localhost:3000/"];

objectManager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"WTF.sqlite"];

// Setup our object mappings
RKManagedObjectMapping* topicMapping = [RKManagedObjectMapping mappingForClass:[Topic class]];
storyMapping.primaryKeyAttribute = @"topicID";
storyMapping.setDefaultValueForMissingAttributes = YES;
[storyMapping mapKeyPathsToAttributes:
 @"id", @"topicID",
 ....
 @"created_at", @"dateCreated", nil];

RKManagedObjectMapping* postMapping = [RKManagedObjectMapping mappingForClass:[Post class]];
sentencesMapping.primaryKeyAttribute = @"postID";
[sentencesMapping mapKeyPathsToAttributes:
 @"id", @"postID",
 ...
 @"text", @"text" , nil];

//setup relationships
[storyMapping mapRelationship:@"posts" withMapping:postMapping];//topic -> (posts) -> post

// Register our mappings with the provider
[objectManager.mappingProvider setMapping:topicMapping forKeyPath:@"topic"];
[objectManager.mappingProvider setMapping:postMapping forKeyPath:@"post"];

// Set Up Router
[objectManager.router routeClass:[Topic class] toResourcePath:@"/topics.json" forMethod:RKRequestMethodPOST];
[objectManager.router routeClass:[Topic class] toResourcePath:@"/topics/(topicID).json"];
[objectManager.router routeClass:[Post class] toResourcePath:@"/topics/(topic.topicID)/posts.json" forMethod:RKRequestMethodPOST];
[objectManager.router routeClass:[Post class] toResourcePath:@"/topics/(topic.topicID)/(post.postID).json"];    
}

-(void)sendTopic{
    RKObjectManager *manager =[RKObjectManager sharedManager];
    [manager postObject:self.topic delegate:nil block:^(RKObjectLoader *loader) { 
        RKObjectMapping* sendTopicMapping = [RKManagedObjectMapping mappingForClass:[Topic class]];
        [sendTopicMapping mapKeyPathsToAttributes:
         @"id", @"topicID",
         ....
         @"title", @"title", nil];

        RKManagedObjectMapping* postPostMapping = [RKManagedObjectMapping mappingForClass:[Post class]];
        [postPostMapping mapKeyPathsToAttributes:
         @"id", @"postID",
          ....
         @"text", @"text" , nil];

        [sendTopicMapping mapRelationship:@"posts" withMapping:postPostMapping];
        [manager.mappingProvider setMapping:sendTopicMapping forKeyPath:@"topic"];

        loader.serializationMapping = [sendTopicMapping inverseMapping];
    }];
 }

解决方案

I solved it if anyone is interested:

in rails i changed the modle so it will send the restKit client nested json(Format A) like this:

class Topic < ActiveRecord::Base
  has_many :posts
  accepts_nested_attributes_for :posts
  self.include_root_in_json = true 
end

I made the post method attributes nested like this:

-(void)sendTopic{
    RKObjectManager *manager =[RKObjectManager sharedManager];
    [manager postObject:self.topic delegate:nil block:^(RKObjectLoader *loader) { 
    RKObjectMapping* sendTopicMapping = [RKManagedObjectMapping mappingForClass:[Topic class]];
    [sendTopicMapping mapKeyPathsToAttributes:
     @"topic[id]", @"topicID",
     ....
     @"topic[title]", @"title", nil];

    RKManagedObjectMapping* postPostMapping = [RKManagedObjectMapping mappingForClass:[Post class]];
    [postPostMapping mapKeyPathsToAttributes:
     @"post[id]", @"postID",
      ....
     @"post[text]", @"text" , nil];

    [sendTopicMapping mapRelationship:@"posts" withMapping:postPostMapping];
    [manager.mappingProvider setMapping:sendTopicMapping forKeyPath:@"topic"];

    loader.serializationMapping = [sendTopicMapping inverseMapping];
    }];
}

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