我有一个像这样的JSON{"result":1,"messages":[],"users":{}}消息和用户都已填充。如果我想映射，比方说，消息，我会执行以下操作:messageMapping=[RKObjectMappingmappingForClass:[OLMessageclass]];[messageMappingmapKeyPath:@"user_id"toAttribute:@"userID"];[messageMappingmapKeyPath:@"status"toAttribute:@"status"];[messageMappingmapKeyPath:@"text