RestKit使用一组复杂对象进行映射 [英] RestKit Mapping with an array of complex objects

问题描述

我一直在很好地解析我的JSON，但我的服务器只是改变了我。我的JSON过去看起来像这样：

I had been parsing my JSON quite nicely but my server just changed on me. My JSON used to look like this:

{
    "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：

and my mapping looked like this:

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"];

现在我的服务器已更改，我收到了回复：

Now my server has changed and I get this back:

{
    "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
            }
        ]
    }
}

所以我添加了这个到我的映射：

So I added this to my mapping:

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

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

并且是我的班级：

@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JKArray为2的对象其中的对象，都是JKDictionary对象。很明显这是我的数据，但它是以JKDictionary形式。它从未映射到GetResponseInRegionResponse类！

When I parse this JSON, I get one object that has a JKArray of 2 objects in it, both of those are JKDictionary objects. So clearly that is my data, but it is in JKDictionary form. It never mapped to the GetResponseInRegionResponse class!

从阅读github文档看起来我想对数组使用toRelationship方法，但我只是没有看到它放在哪里。如果我按照文章示例并尝试这样：

From reading the github docs it looks like I want to use a toRelationship method for arrays, but I'm just not seeing where to put it. If I follow the "articles" example and try this:

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

我得到这个例外：

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...'

那么如何映射复杂的数组我的JSON中的对象？

So how can I map an array of complex objects inside my JSON?

我感谢任何帮助。谢谢！

I appreciate any help. Thanks!

推荐答案

你是否尝试过只改变

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

以反映数据阵列的更改路径？

to reflect the changed path to your data array?

这篇关于RestKit使用一组复杂对象进行映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！