RestKit 与复杂对象数组的映射

Question

我已经很好地解析了我的 JSON，但我的服务器刚刚改变了我。我的 JSON 曾经看起来像这样：

{
    "blobs": [  
        {
            "createdOn": "2012-03-16T15:13:12.551Z",
            "description": "Fake description",
            "hint": "And a useless hint",
            "id": 400,
            "name": "Fake CA one",
            "publicId": "FF6",
            "type": 0
        },
        {
            "createdOn": "2012-03-16T17:33:48.514Z",
            "description": "No hint on this one, but it does have a description.",
            "hint": "Hint",
            "id": 402,
            "name": "Second fake one in CA",
            "publicId": "FF8",
            "type": 0
        }
    ]
}

我的映射看起来像这样：

RKObjectMapping* blobMapping = [RKObjectMapping mappingForClass:[GetResponseInRegionResponse class]];

[blobMapping mapKeyPath:@"name" toAttribute:@"name"];
[blobMapping mapKeyPath:@"id" toAttribute:@"blobId"];
[blobMapping mapKeyPath:@"description" toAttribute:@"description"];
[blobMapping mapKeyPath:@"hint" toAttribute:@"hint"];

[[RKObjectManager sharedManager].mappingProvider setMapping:blobMapping forKeyPath:@"blobs"];

现在我的服务器已经改变，我得到了这个：

{
    "blobsList": {
        "blobs": [  
            {
                "createdOn" :"2012-03-16T15:13:12.551Z",
                "description": "Fake description",
                "hint": "And a useless hint",
                "id": 400,
                "name": "Fake CA one",
                "publicId": "FF6",
                "type": 0
            },
            {
                "createdOn": "2012-03-16T17:33:48.514Z",
                "description": "No hint on this one, but it does have a description.",
                "hint": "Hint",
                "id": 402,
                "name": "Second fake one in CA",
                "publicId": "FF8",
                "type": 0
            }
        ]
    }
}

所以我将它添加到我的映射中：

RKObjectMapping* blobsListMapping = [RKObjectMapping mappingForClass:[GetResponseInRegionResponseList class]];
[blobsListMapping mapKeyPath:@"blobsList" toAttribute:@"blobsList"];

[[RKObjectManager sharedManager].mappingProvider setMapping:blobsListMapping forKeyPath:@"blobsList"];

并且是我的课程：

@interface GetResponseInRegionResponse : NSObject
{
    NSString* name;
    NSString* blobId;
    NSString* description;
    NSString* hint;
}       

@interface GetResponseInRegionResponseList : NSObject
{
    NSArray  *blobsList;
}

当我解析这个 JSON 时，我得到一个对象，其中包含 2 个对象的 JKArray，这两个对象都是 JKDictionary 对象。很明显，这是我的数据，但它是 JKDictionary 形式的。它从未映射到 GetResponseInRegionResponse 类！

从阅读 github 文档看来，我想对数组使用 toRelationship 方法，但我只是不知道该放在哪里。如果我按照“文章”示例并尝试以下操作：

[blobListMapping mapKeyPath:@"blobs" toAttribute:@"blobsList"];
[blobListMapping mapKeyPath:@"blobs" toRelationship:@"blobsList" withMapping:blobMapping];

我得到了这个例外：

2012-03-19 14:59:53.704 Ferret[8933:16303] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unable to add mapping for keyPath blobsList, one already exists...'

那么如何在我的 JSON 中映射一个复杂对象的数组？

感谢您的帮助。谢谢！

Answer 1

你试过只改变

    [[RKObjectManager sharedManager].mappingProvider setMapping:blobMapping forKeyPath:@"blobsList.blobs"];

反映更改后的数据数组路径？

Answer 2

接受的答案似乎针对当前版本 v0.2 之前的版本。我的解决方案看起来略有不同，代码粘贴在下面：

RKObjectMapping * eventMapping = [RKObjectMapping mappingForClass:[RKJMEvent class]];
[eventMapping addAttributeMappingsFromDictionary:[RKJMEvent map]];

RKObjectMapping * eventResponseMapping =[RKObjectMapping mappingForClass:[RKJMEventsResponse class]];
[eventResponseMapping addAttributeMappingsFromDictionary:[RKJMEventsResponse map]];
[eventResponseMapping addRelationshipMappingWithSourceKeyPath:@"events" mapping:eventMapping];


RKResponseDescriptor *responseDescriptorEventResponse = [RKResponseDescriptor responseDescriptorWithMapping:eventResponseMapping
                                                                                    pathPattern:API_GET_EVENTS_PATH
                                                                                        keyPath:nil
                                                                                    statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptorEventResponse];