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我正在使用带有对象映射的 Restkit，但我似乎收到一条错误消息Encountered errors during mapping: Expected an object mapping for class of type 'Rating', provider returned one for 'Error'- 现在我已经为 Rating 和 Error 对象设置了映射和序列化，所以我不明白为什么会混淆。任何人都可以帮忙吗？

这是从类返回的映射

// Rating class
+ (RKObjectMapping *)getRestKitObjectMapping {
    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Rating class]];
    [mapping mapAttributes:@"id", @"mics", @"mdate", @"ipaddress", nil];
    [mapping mapKeyPath:@"user_id" toAttribute:@"userID"];
    [mapping mapKeyPath:@"fid" toAttribute:@"fid"];


    return mapping;
}

// Error class
+ (RKObjectMapping *)getRestKitObjectMapping {
    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Error class]];
    [mapping mapKeyPath:@"code" toAttribute:@"code"];
    [mapping mapKeyPath:@"message" toAttribute:@"message"];

    return mapping;
}

这是对象路由

[[RKObjectManager sharedManager].router routeClass:[Rating class] toResourcePath:@"/mic/:id"];
    [[RKObjectManager sharedManager].router routeClass:[Rating class] toResourcePath:@"/mic" forMethod:RKRequestMethodPOST];

[[RKObjectManager sharedManager].mappingProvider setMapping:[Rating getRestKitObjectMapping] forKeyPath:@"ratings"];
    [[RKObjectManager sharedManager].mappingProvider setMapping:[Error getRestKitObjectMapping] forKeyPath:@"error"];

[[RKObjectManager sharedManager].mappingProvider setSerializationMapping:[[Rating getRestKitObjectMapping] inverseMapping] forClass:[Rating class]];
    [[RKObjectManager sharedManager].mappingProvider setSerializationMapping:[[Error getRestKitObjectMapping] inverseMapping] forClass:[Error class]];

Rating *rating = [[Rating alloc] init];
[[RKObjectManager sharedManager] postObject:rating delegate:self];

这些是委托方法，didLoadObjects确实被调用

- (void)objectLoader:(RKObjectLoader *)objectLoader didFailWithError:(NSError *)error
{
    NSLog(@"Object loading failed with error: %@ ----- body: %@", error.localizedDescription, objectLoader.response.bodyAsString);
}


- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects
{
    NSLog(@"Objects received: %@", objects);
    NSLog(@"Respond body: %@", objectLoader.response.bodyAsString);
}

这是 JSON 响应

{"error":{"error":1,"code":342,"message":"You have already rated this one"}}

此外，当我查看我的 REST PHP 后端上的 $_POST 值时，它实际上是空的，这意味着它没有接收到发布对象……这是为什么呢？我的路由好像没问题？

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1 回答 1

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您对后端服务有任何控制权吗？

如果是这样，我会改变你发回数据的方式。当您进行“postObject”调用时，唯一预期的响应是“Rating”。我意识到您设置了一个“错误”映射，但由于您发布的对象是一个“评级”对象，它期待它回来。

这里更合适的是服务将 HTTP 状态代码更改为 403（禁止），或者不是 200（正常）。然后您可以在“objectLoader:didFailWithError:”委托方法中处理错误。

于 2012-09-06T13:49:04.113 回答