ios - Restkit:在一个请求中映射到两个responseDescriptor

Question

我有一个请求给我两部分数据，json 看起来像这样

{
    "banner_content":
    [
        {
            "activi_id":"1",
            "activi_pic":
        },
        {
            "activi_id":"2",
            "activi_pic":
        },
    ],
    "categories":
    [
        {...},
        {...},
    ]
}

当我编写 responseDescriptor 来映射数据时，我发现我必须定义一个包含 banner_content 数组和 categories 数组的模型(我不想)否则我必须写两个 responseDescriptors 来做，当请求完成时，我必须从 (RKMappingResult *)mappingResult 中获取两部分数据然后获取像 [mappingResult objectForKey:@"banner_content"] 和 [mappingResult objectForKey:@"categories"] 这样的数组很奇怪

下面是我的代码文件:RCategory.m

@implementation RCategory


 + (NSDictionary *)_mapping {
     return @{@"title" : @"title"};
}

 + (RKObjectMapping *)mapping {

    // Setup our object mappings
    RKObjectMapping *categoryMapping = [RKObjectMapping mappingForClass:[self class]];
    [categoryMapping addAttributeMappingsFromDictionary:[[self class] _mapping]];

     RKObjectMapping *itemMapping = [RCategoryItem mapping];

    RKRelationshipMapping* relationShipMapping = [RKRelationshipMapping      relationshipMappingFromKeyPath:@"content"
                                                                                              toKeyPath:@"items"
                                                                                       withMapping:itemMapping];
[categoryMapping addPropertyMapping:relationShipMapping];

    return categoryMapping;
}

@end

文件:RAd.m 被忽略

文件:viewController.m

- (void)loadCategory {
    // Load the object model via RestKit
    RKObjectManager *objectManager = [RKObjectManager sharedManager];

    RKObjectMapping *categoryMapping = [RCategory mapping];

    RKResponseDescriptor *categoryResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:categoryMapping
                                                                                        method:RKRequestMethodGET
                                                                                   pathPattern:nil
                                                                                       keyPath:@"category"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

    RKObjectMapping *adsMapping = [RAd mapping];
    RKResponseDescriptor *adResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:adsMapping
                                                                                                method:RKRequestMethodGET
                                                                                           pathPattern:nil
                                                                                               keyPath:@"banner_content"
                                                                                           statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

     //** DO I MUST ADD TWO RESPONSE_DESCRIPTOR FOR ONE REQUEST??**
    [objectManager addResponseDescriptor:categoryResponseDescriptor];
    [objectManager addResponseDescriptor:adResponseDescriptor];

    [objectManager getObjectsAtPath:RPATH(CATEGORY_PATH)
                     parameters:nil
                        success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                            NSArray* statuses = [mappingResult array];
                            [self.categories addObjectsFromArray:statuses];
                            if ([self isViewLoaded]) {
                                [self.tableView reloadData];
                            }
                        }
                        failure:^(RKObjectRequestOperation *operation, NSError *error) {
                            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                                            message:[error localizedDescription]
                                                                           delegate:nil
                                                                  cancelButtonTitle:@"OK"
                                                                  otherButtonTitles:nil];
                            [alert show];
                            NSLog(@"Hit error: %@", error);
                        }];

}

有没有人有更好的方法来解决我的问题？顺便说一句，我在模型类中编写了 -mapping，这是我能想到的最简单和最好的方法我想知道你是如何写映射的。

Answer 1

您需要 2 个响应描述符，因为响应有 2 个逻辑上独立的部分。这可以。如果您使用的是 Core Data，那么您就不必担心，因为您的所有对象都将简单地保存到上下文中，您可以根据需要获取它们。使用对象映射，如果您不关心分组，那么您可以从映射结果中获取所有对象的数组。

从模型对象返回的数据创建映射很好 - 但它确实限制了你，因为每个目标键只能有一个源键。当您对具有不同 key 的同一对象有不同的响应时会发生什么，这意味着与其他 key 相同(希望您没有，但这完全取决于服务器 API)。