RestKit 对象映射 - 解析嵌套数组

Question

我非常坚持映射一个简单的 JSON 对象：

{"articles":
[{"id":"354633","lat":"51.501","lng":"-0.125","type":"railwaystation","title":"Westminster tube station","url":"http:\/\/en.wikipedia.org\/w\/index.php?curid=354633","distance":"53m"},

{"id":"92601","lat":"51.5011","lng":"-0.125","type":"railwaystation","title":"17  - Westminster tube station","url":"http:\/\/en.wikipedia.org\/w\/index.php?   curid=92601","distance":"62m"},    

{"id":"92598","lat":"51.5011","lng":"-0.125","type":"railwaystation","title":"34 -Westminster tube station","url":"http:\/\/en.wikipedia.org\/w\/index.php?curid=92598","distance":"62m"}]
}

我对我遇到的问题感到非常困惑，因为这与 RestKit 映射指南中的 JSON 几乎相同。

我的代码是：

self.articleMapper = [RKObjectMapping mappingForClass:[WikiArticle class]];
[self.articleMapper mapKeyPath:@"title" toAttribute:@"title"];    
[[RKObjectManager sharedManager].mappingProvider setMapping:self.articleMapper forKeyPath:@"articles"];

我在日志中收到以下错误：

restkit.object_mapping:RKObjectMappingOperation.m:339 Did not find mappable attribute value keyPath 'title'
restkit.object_mapping:RKObjectMappingOperation.m:557 Mapping operation did not find any mappable content
restkit.object_mapping:RKObjectMapper.m:308 The following operations are in the queue: ()
restkit.object_mapping:RKObjectMapper.m:323 Finished performing object mapping. Results: {}

提前感谢您帮助我解决了这么简单的问题——我已经为此苦苦挣扎了好几个小时了！

-亚历克斯

Answer 1

我想你是这样称呼它的：

[objectManager loadObjectsAtResourcePath:url delegate:self block:^(RKObjectLoader* loader) {
        loader.objectMapping = [objectManager.mappingProvider objectMappingForClass:[WikiArticle class]];
    }];

最好试试：

[objectManager loadObjectsAtResourcePath:url delegate:self];