核心数据中的 Restkit 复杂对象映射，带有嵌套对象数组

Question

我正在使用 coredata 和 Restkit 来映射数据。

这是 getsales 调用的 json 响应，

{   "success":true,
"sales" : [
            {
        "brands" :[
        {"id":"637", "name":"XYZ"},
        {"id":"638", "name":"abc"}
        ]
        "end_date" = "2011-10-14 12:00:00",
        "id" = 3794,
        "image" = "http://dummy.something.com.jpg",
        "name" = "test",
    },
       {
       "brands" =[
        {"id":"640", "name":"abc"}
        ],
        "end_date" = "2011-10-14 12:00:00",
        "id" = 3766,
        "image" = "http://dummy.something.com.jpg",
        "name" = "text2",
    },
       {
       "brands" =[
        {"id":"641", "name":"XYZ"},
        {"id":"642", "name":"abc"},
        {"id":"643", "name":"def"}
        ],
        "end_date" = "2011-11-06 12:00:00",
        "id" = 3798,
        "image" = "http://dummy.something.com.jpg",
        "name" = "test3",
    }
]
}

我

@interface Sale : NSManagedObject{   
}
@property (nonatomic, retain) NSNumber * ID;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSDate * endDate;
@property (nonatomic, retain) NSString * imageUrl;

@implementation Sale

@dynamic ID;
@dynamic name;
@dynamic startDate;
@dynamic endDate;
@dynamic imageUrl;

正在尝试按以下方式映射响应

- (void)getSales{
    RKObjectManager* objectManager = [RKObjectManager     objectManagerWithBaseURL:@"http://baseurl.com"];
    RKManagedObjectStore* objectStore = [RKManagedObjectStore     objectStoreWithStoreFilename:@"base.sqlite"];
objectManager.objectStore = objectStore;


RKManagedObjectMapping* saleMapping = [RKManagedObjectMapping mappingForClass:[Sale class]];
    [saleMapping mapKeyPathsToAttributes:
     @"id", @"ID",
     @"name", @"name",
     @"start_date",@"startDate",
     @"end_date", @"endDate",
     @"image", @"imageUrl",
     nil];

    saleMapping.primaryKeyAttribute = @"ID";
    [[RKObjectManager sharedManager].mappingProvider setMapping:saleMapping forKeyPath:@"sales"];

[[RKObjectManager sharedManager] loadObjectsAtResourcePath:@"/getSales/" objectMapping:saleMapping delegate:self];
}

，本质上我有嵌套的对象数组，映射这些对象的正确方法是什么？ Sale 类应该有什么类型的属性来存储品牌列表？

感谢任何帮助，我已经浪费了太多时间来解决这个问题。

Answer 1

尝试添加：

[saleMapping mapKeyPath:@"brands" toRelationship:@"brands" withMapping:[BrandObject objectMapping]];

其中 [BrandObject objectMapping] 是 BrandObject 的映射 (具有 id 和 name 属性的 NSManagedObject）。

本质上，您可以使用 mapKeyPath:toRelationship:withMapping: 来嵌套映射。您还需要向 Sale 对象添加一个 NSSet 类型的属性：

@property (nonatomic, keep) NSSet *brands;

最后，在实现销售对象，添加：@dynamic Brands 以及其他 @dynamic 语句。

希望这有帮助！谢谢。