ios - 我应该如何正确映射带有代码 200 的错误响应？

Question

我使用 RestKit 0.20 和 iOS 7。

我想从 REST API 映射错误响应。它是这样的：

{
  "error": {
    "error_code": 5,
    "error_msg": "User authorization failed: invalid access_token.",
    "request_params": [
      {
        "key": "oauth",
        "value": "1"
      },
      {
        "key": "method",
        "value": "execute.MusicNews"
      },
      {
        "key": "access_token",
        "value": "e2276858338752ef3f6f974b0996e4a1755a5b17178781a6602be1e6c2aa0e23bfb89ec040c787d2dc753"
      }
    ]
  }
}

问题是 API 返回错误代码200。

RKObjectMapping在块中创建并RKResponseDescriptor为此响应和检查响应类不是问题success，但是如何通知 RESTKit 从“错误”键路径开始的响应应该被视为错误，即使状态代码是200并且调用failure块？

Answer 1

我的解决方案是一个小技巧：

我做了一个像这样的子类：

@interface NutHTTPRequestOperation : RKHTTPRequestOperation

@end

@implementation NutHTTPRequestOperation
- (NSError *)error
{
    NSError * error = nil;
    //It seems only call to responseJSON could make AFJSONRequestOperation process error
    id object = [self.responseString objectFromJSONString];

    if ([object isKindOfClass:[NSDictionary class]]) {
        NSNumber * ret = [object objectForKey:@"ret"];
        if (!ret || 0 != ret.integerValue) {
            NSString * desc = [object objectForKey:@"error"];
            error = [NSError errorWithDomain:kNutResponseErrorDomain code:ret.integerValue userInfo:@{NSLocalizedDescriptionKey: desc}];
        }
    }

    if(!error){
        //Get super error , if none, proceed self error
        NSError * error = [super error];
        if (error) {
            return error;
        }
        error = [NSError errorWithDomain:kNutResponseErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey: @"not json dictionary"}];
    }
    return error;
}