Question

使用RestKit我在映射以下JSON时遇到问题：如您所见，languages属性/关系不包含语言实体的任何关键信息。

{
  "data": {
    "version": "1.0", 
    "languages": {
      "en": "English",
      "es": "Espanol"
    }
  }
}

json - ＆＃34;数据＆＃34; object被映射到RootData对象，该对象适用于version属性。

class RootData: NSManagedObject {
    @NSManaged var version: String?
    @NSManaged var languages: NSOrderedSet?
}

现在，我想映射关键路径＆＃34; data.languages＆＃34;一个OrderedSet语言对象，如：

class Language: NSManagedObject {
    @NSManaged var identifier: String?
    @NSManaged var name: String?
}

我想最终得到一组语言对象：

(pseudo-code)
rootData.firstLanguage.identifier == "en"
rootData.firstLanguage.name == "English"

rootData.secondLanguage.identifier == "es"
rootData.secondLanguage.name == "Espanol"

但我不知道如何映射RootData-＆gt;语言1：n关系。

谢谢，任何帮助表示赞赏。

Answer 1

像往常一样为嵌套内容创建映射，然后在其上设置forceCollectionMapping，让RestKit将字典转换为数组，以便映射处理。

Answer 2

此映射解决了它：

let rootMap = RKEntityMapping(forEntityForName: "RootData", inManagedObjectStore: store)
let rootDict = ["data.version": "version",] as [NSObject: AnyObject]!
rootMap.addAttributeMappingsFromDictionary(rootDict)

let languagesMap = RKEntityMapping(forEntityForName: "Language", inManagedObjectStore: store)


languagesMap.forceCollectionMapping = true      // thanks @Wain
//
// the following solved my problem regarding the mapping:
// - Key not present: * map from representation
//                    * reference identifier in name-mapping
// - Add identification attribute to keep them unique
//
let languageDict = ["(identifier)": "name",] as [NSObject : AnyObject]!    
languagesMap.addAttributeMappingsFromDictionary(languageDict)
languagesMap.identificationAttributes = ["identifier"]
languagesMap.addAttributeMappingFromKeyOfRepresentationToAttribute("identifier")

rootMap.addPropertyMapping(
    RKRelationshipMapping(
        fromKeyPath: "data.languages",
        toKeyPath: "languages", 
        withMapping: languagesMap)
    )

感谢任何人如何加入。

使用没有属性名称的RestKit映射JSON

2 个答案: