RestKit:如何为不同的键名进行映射 [英] RestKit: how to make a mapping for varying key names

问题描述

我正在尝试为有点怪异的结构化JSON创建动态映射. 我有映射到对象的数组"之类的稀薄对象，以便数组索引 按键，例如:

I'm trying to make a dynamic mapping for a bit weird structured JSON. I have "array mapped to object" sort of thins so that array indices ake keys e.g.:

{
 "0": {object},
 "1": {another object},
 "2": {yet another object},
 ...
}

所有对象都是相同的类型，因此可以使用相同的对象进行解析 映射，但是如何处理不同的键名?

All objects are of the same type so they can be parsed using the same mapping, but how to deal with varying key names?

推荐答案

在他介绍了一个使用JSON的示例(在此处复制):

He walks through an example (copied here) with the JSON:

{ "blake": {
    "email": "[e-mail]",
    "favorite_animal": "Monkey"
    }
}

对应于User类:

@interface User : NSObject
@property (nonatomic, retain) NSString* email
@property (nonatomic, retain) NSString* username;
@property (nonatomic, retain) NSString* favoriteAnimal;
@end

您会注意到，username属性对应于JSON的 key .

Which, you'll notice, the username property corresponds to the key of the JSON.

为了进行映射，他使用特殊的括号语法来表明它们本身就是一个属性:

In order to map it, he uses a special parenthesis syntax to indicate that they key itself is a property:

RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[User class] ];
[mapping mapKeyOfNestedDictionaryToAttribute:@"username"];
[mapping mapFromKeyPath:@"(username).email" toAttribute:"email"];
[mapping mapFromKeyPath:@"(username).favorite_animal" toAttribute:"favoriteAnimal"];

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