Question

我正在尝试加载与我的用户对象具有多对一关系的实体列表。在这种情况下，User对象包含需要映射的通道列表（首先仅实例化通道ID，然后再延迟加载）API返回数组中通道的ID然后我尝试转换该数组使用RKRelationshipMapping进入通道数组。但是，它不断抛出

[＆lt; __ NSCFString 0x7ff0f243ece0＆gt; valueForUndefinedKey：]：此类不是密钥值的密钥值

这是JSON

{"id":"10","createDate":1412222248943,"modDate":1412222269588,"emailAddress":"chentsen1005@gmail.com","firstName":"test_account","lastName":"test_account_lastName","password":"****","referralCode":"password","channelSubscriptions":["1","2","3"]}

这是我的映射代码（在swift中，但不应该重要）

class func mapReadUsersEndpoint(managedObjectStore : RKManagedObjectStore){
    var statusCodes = RKStatusCodeIndexSetForClass(UInt(RKStatusCodeClassSuccessful))
    var userGetRequestMapping = RKObjectMapping.requestMapping()
    userGetRequestMapping.addAttributeMappingsFromDictionary(["id":"id"])
    var userGetRequestDescriptor = RKRequestDescriptor(mapping: userGetRequestMapping,
        objectClass: User.self,
        rootKeyPath: nil,
        method : RKRequestMethod.GET)

    var userGetResponseMapping = RKEntityMapping(forEntityForName: "User", inManagedObjectStore: managedObjectStore)
    userGetResponseMapping.addAttributeMappingsFromDictionary(["firstName":"firstName",
        "lastName":"lastName",
        "emailAddress":"email",
        "referralCode":"referralCode",
        "password":"password"])

    var channelMapping = RKEntityMapping(forEntityForName: "Channel", inManagedObjectStore: managedObjectStore)
    channelMapping.addAttributeMappingsFromDictionary(["" : "channel_id"])
    var channelRelationshipMapping = RKRelationshipMapping(fromKeyPath: "channelSubscriptions", toKeyPath: "subscribedChannels", withMapping: channelMapping)
    userGetResponseMapping.addPropertyMapping(channelRelationshipMapping)

    var userGetResponseDescriptor = RKResponseDescriptor(mapping: userGetResponseMapping, method: RKRequestMethod.GET, pathPattern: "/resources/account/:id/", keyPath: nil, statusCodes: statusCodes)
    RKObjectManager.sharedManager().addRequestDescriptor(userGetRequestDescriptor)
    RKObjectManager.sharedManager().addResponseDescriptor(userGetResponseDescriptor)

，最后是错误信息

Performing mapping operation: <RKMappingOperation 0x7ff0f278ad00> for 'Channel' object. Mapping values from object 1 ({
HTTP =     {
    request =         {
        URL = "http://localhost:8080/resources/account/10/";
        headers =             {
            Accept = "application/json";
            "Accept-Language" = "en;q=1, fr;q=0.9, de;q=0.8, zh-Hans;q=0.7, zh-Hant;q=0.6, ja;q=0.5";
            "User-Agent" = "Hip/1 (iPhone Simulator; iOS 8.0; Scale/2.00)";
        };
        method = GET;
    };
    response =         {
        URL = "http://localhost:8080/resources/account/10/";
        headers =             {
            "Content-Type" = "application/json";
            Date = "Thu, 02 Oct 2014 04:22:41 GMT";
            Server = "Jetty(9.2.2.v20140723)";
            "Transfer-Encoding" = Identity;
        };
    };
};
mapping =     {
    collectionIndex = 0;
    rootKeyPath = "<null>";
};
}) 

to object <Channel: 0x7ff0f279f340> (entity: Channel; id: 0x7ff0f279f3b0 <x-coredata:///Channel/tBBBCA84F-8C28-4729-8E06-A93802EFE14E2> ; data: {
    backgroundColor = 0;
    backgroundImage = nil;
    channelDescription = nil;
    "channel_id" = nil;
    followers = 0;
    imageData = nil;
    isPublic = nil;
    name = nil;
    referralSource = nil;
    subscribers =     (
    );
    threads =     (
    );
}) with object mapping (null)
2014-10-02 00:22:41.789 Hip[99685:3770746] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFString 0x7ff0f243ece0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key .'

我在这里很迷失 - 看起来我已经关注了Github页面上的所有内容。任何建议都非常感谢。感谢

RestKit关系映射与ID数组

0 个答案: