使用RESTKit映射服务器错误

Question

我成功使用RESTKit来访问Web服务。但我有问题将服务器错误（如404,403 ...）映射到RESTKit的标准RKErrorMessage类。假设我从我的服务获得以下JSON响应以及403状态代码：

{"errors":{"message":"Some error message"}}

在我的iOS应用程序中，我尝试使用以下方法映射错误：

RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class
[errorMapping addPropertyMapping:[RKAttributeMapping
   attributeMappingFromKeyPath:@"message" toKeyPath:@"message"]];

statusCodes4xx = RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError);

errorDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:notecardMapping 
                     pathPattern:nil keyPath:@"errors" statusCodes:statusCodes4xx];

但我得到的只是来自RESTKit的错误：

Failed mapping operation: No mappable values found for any of the attributes or relationship mappings

我的错在哪里？例如，它只是描述符中的错误路径吗？

Answer 1

您似乎在响应描述符中使用notecardMapping而不是errorMapping。试试这个：

RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];

[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorMessage"]];

RKResponseDescriptor *errorDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:errorMapping
                                                                                pathPattern:nil
                                                                                    keyPath:@"errors.message"
                                                                                statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError)];

[manager addResponseDescriptorsFromArray:@[errorDescriptor]];