errorMapping定义为:[[[[RKObjectManagersharedManager]mappingProvider]errorMapping]setRootKeyPath:@"error"];它可以很好地处理作为字符串的简单错误消息:renderstatus::unprocessable_entity,json:{:error=>'cannotcreatetopic'}但是，哈希响应失败:renderstatus::unprocessable_entity,json:{:error=>@topic.errors}并给出:Wrestkit.object_mapping:RK