RestKit 映射上的关系错误

Posted 2023-02-23

【中文标题】RestKit 映射上的关系错误

【英文标题】：Relationship fault on RestKit Mapping

【发布时间】：2015-09-16 08:47:30

【问题描述】：

我真的不明白为什么我会出错：/ 有人可以看看吗？

Json 文件：

"total_count": 3,
"incomplete_results": false,
"winners": [
    
        "windate": "2015-05-26 17:11:30.0",
        "gift": "foo",
        "email": "foo",
        "giftack": "foo",
        "lastname": "foo",
        "gender": "foo",
        "firstname": "foo",
        "updategiftdate":null
    
],
"nbWinners": 3

映射文件：

    //Winner List Mapping
RKEntityMapping *winnerListMapping =
    [RKEntityMapping mappingForEntityForName:@"WinnerList"
                        inManagedObjectStore:managedObjectStore];
winnerListMapping.identificationAttributes = @[@"nbWinners"];
[winnerListMapping addAttributeMappingsFromDictionary:@
                                    @"total_count" : @"totalCount",
                             @"incomplete_results" : @"incompleteResults",
                                      @"nbWinners" : @"nbWinners" ];

//Winner Mapping
RKEntityMapping *winnerMapping =
    [RKEntityMapping mappingForEntityForName:@"Winner"
                        inManagedObjectStore:managedObjectStore];
winnerMapping.identificationAttributes = @[@"winDate"];
[winnerMapping addAttributeMappingsFromArray:@[
                                            @"windate", @"gift", @"email", @"giftack", @"lastname", @"gender", @"firstname", @"updategiftdate"]];

//Link Winner to WinnerList
[winnerListMapping addPropertyMapping:
    [RKRelationshipMapping relationshipMappingFromKeyPath:@"winners"
                                                toKeyPath:@"winners"
                                              withMapping:winnerMapping]];

//Run Mapping
RKResponseDescriptor *winnerListResponseDescriptor =
[RKResponseDescriptor responseDescriptorWithMapping:winnerListMapping
                                             method:RKRequestMethodGET
                                        pathPattern:@"example.json"
                                            keyPath:nil
                                        statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)
 ];
[objectManager addResponseDescriptor:winnerListResponseDescriptor];

数据模型：

最后：

2015-09-16 10:13:25.018 iDol Check[26031:954937] ????????????????????????????????????????????????
(
    "<WinnerList: 0x7f9d0167f4b0> (entity: WinnerList; id: 0xd0000000000c0000 <x-coredata://7E40E0FD-3677-45EA-9BD1-59F755C05BC5/WinnerList/p3> ; data: \n    incompleteResults = 0;\n    nbWinners = 3;\n    totalCount = 3;\n    winners = \"<relationship fault: 0x7f9d0167afa0 'winners'>\";\n)"
)

提前感谢您的帮助！

【参考方案1】：

我打赌这是错误。

//Link Winner to WinnerList
[winnerListMapping addPropertyMapping:
    [RKRelationshipMapping relationshipMappingFromKeyPath:@"winners"
                                                toKeyPath:@"winners"
                                              withMapping:winnerMapping]];

特别是 toKeyPath:@"winners" 您的 Winner 模型没有 winners 属性。

【讨论】：

relationshipMappingFromKeyPath 是 WinnerList 属性，toKeyPath 是 json 属性，不是吗？目的，就是把WinnerMapping的所有内容（很多Winner对象）就是WinnerList对象。所以获胜者不需要获胜者属性

你是对的。我注意到一个无法识别的选择器错误“[Winner Winners]”，并认为是这样。我猜你已经解决了这个问题，如果不是赢家映射在我看来是错误的。也许这会导致解析错误。尝试使用与上述winnerListMapping相同的方式使用字典。

是的，我解决了这个问题。但这不是真正的问题；）我真的不明白为什么它不起作用，但我已经改变了这样做的方式，现在它正在起作用。谢谢:)