RestKit 在缓存中重复

Posted 2023-03-13

【中文标题】RestKit 在缓存中重复

【英文标题】：RestKit duplicates in cache

【发布时间】：2014-11-23 13:24:11

【问题描述】：

我的 cahce 中有一些奇怪的重复项

我的数据模型是

我得到这个 json 输入：

    "pages": 1,
    "salads": [
        
            "id": 374,
            "img": "http://salatiki.com.ua/images/mini/20120114_457.jpg",
            "ingredCount": 5,
            "ingredients": "курятина, яблоко, сыр твёрдый, икра красная, майонез",
            "my_favorite": 1,
            "name": "Сердце",
            "rating": 5
        ,
        
            "id": 336,
            "img": "http://salatiki.com.ua/images/mini/20111229_2110.jpg",
            "ingredCount": 6,
            "ingredients": "креветки, салат, помидор, чеснок, майонез, сметана",
            "my_favorite": 1,
            "name": "Итальянский с креветками",
            "rating": 5
        
    ]

数组“沙拉”可以在更少的对象上比示例中包含更多

这是我的日志：

    Fetch result: (
        "<SSaladCards: 0x797437b0> (entity: SSaladCards; id: 0x79635760 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladCards/p13> ; data: \n    sPages = 1;\n    salads =     (\n        \"0x796529e0 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladsCardData/p2>\",\n        \"0x79d613f0 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladsCardData/p1>\"\n    );\n)",
        "<SSaladCards: 0x79d438a0> (entity: SSaladCards; id: 0x79d59900 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladCards/p1> ; data: <fault>)",
        "<SSaladCards: 0x79d67830> (entity: SSaladCards; id: 0x79d439a0 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladCards/p3> ; data: <fault>)",
        "<SSaladCards: 0x79d43930> (entity: SSaladCards; id: 0x79d439b0 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladCards/p4> ; data: <fault>)",
....

我的代码： 我的商店和经理是在 appDelegate 中分配的，这些代码我在第一个 ViewController 中使用，所以我调用 sharedManager 和 defaultStore

RKEntityMapping *saladPageMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([SSaladCards class]) inManagedObjectStore:[RKManagedObjectStore defaultStore]];
            [saladPageMapping addAttributeMappingsFromDictionary:@ @"pages" : @"sPages", ];
            saladPageMapping.identificationAttributes = @[@"sPages"];

            RKEntityMapping *saladsBodyMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([SSaladsCardData class]) inManagedObjectStore:[RKManagedObjectStore defaultStore]];
            [saladsBodyMapping addAttributeMappingsFromDictionary:@ @"id" : @"sId",
                                                                      @"img" : @"sImage",
                                                                      @"name" : @"sName",
                                                                      @"rating" : @"sRating",
                                                                      @"ingredients" : @"sIngredients",
                                                                      @"ingredCount" : @"sIngredientsCount",
                                                                      @"my_favorite" : @"sFavorites" ];
            saladsBodyMapping.identificationAttributes = @[@"sId"];

            [saladPageMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"salads"
                                                                                             toKeyPath:@"salads"
                                                                                           withMapping:saladsBodyMapping]];

            RKResponseDescriptor *saladPageDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:saladPageMapping
                                                                                                     method:RKRequestMethodGET
                                                                                                pathPattern:nil
                                                                                                    keyPath:nil
                                                                                                statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

            [[RKObjectManager sharedManager] addResponseDescriptorsFromArray: @[saladPageDescriptor]];

            NSURLRequest *salRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://salatiki.com.ua/api/get.php?getByCat=-1&page=1&ukey=%@", [keychainWrapper objectForKey:(__bridge id)(kSecValueData)]]]];
            RKManagedObjectRequestOperation *saladOperation = [[RKManagedObjectRequestOperation alloc] initWithRequest:salRequest responseDescriptors:@[saladPageDescriptor]];
            saladOperation.managedObjectContext = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
            saladOperation.managedObjectCache = [RKManagedObjectStore defaultStore].managedObjectCache;
            NSOperationQueue *operationQueue = [NSOperationQueue new];
            [operationQueue addOperation:saladOperation];

我如何获取对象

-(NSFetchedResultsController *)saladCardFetcehdResController 
    if (_saladCardFetcehdResController != nil) 
        return _saladCardFetcehdResController;
    

    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass([SSaladCards class])];

    NSSortDescriptor *pages = [[NSSortDescriptor alloc] initWithKey:@"sPages" ascending:YES];
    [fetchRequest setSortDescriptors:@[pages]];
    [fetchRequest setReturnsObjectsAsFaults:NO];
    [fetchRequest setFetchBatchSize:20];

    self.saladCardFetcehdResController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext sectionNameKeyPath:nil cacheName:@"Salad"];
    self.saladCardFetcehdResController.delegate = self;

    NSError *error = nil;

    if (![self.saladCardFetcehdResController performFetch:&error]) 
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    else
        NSLog(@"Salad Fetch count: %i",[[self.saladCardFetcehdResController fetchedObjects] count]);
        NSLog(@"Salad Fetch result: %@",[self.saladCardFetcehdResController fetchedObjects]);
    

    return _saladCardFetcehdResController;

每次我向服务器发出请求时，它都会向我的缓存中添加一个“故障”对象

"<SSaladCards: 0x79d438a0> (entity: SSaladCards; id: 0x79d59900 <x-coredata://9277267C-0FAA-4E7B-BCE2-157DA4CF9D34/SSaladCards/p1> ; data: <fault>)"

为什么我有重复？请帮忙:(

【参考方案1】：

在 FRC 上使用缓存可能没有帮助，尽管它可能不是导致此问题的原因。

我猜你没有配置获取请求或内存中managedObjectCache（供RKManagedObjectStore使用），因为这是允许RestKit在数据存储中查找现有项目并更新它们的机制的创建新实例。

【讨论】：

谢谢，如何配置获取请求？

您查看过managedObjectCache 上RKManagedObjectStore 的文档吗？

是的，我的 managedObjectCache 不为零，我不明白为什么我有重复，因为我的应用程序中的相同代码工作正常

我的意思是我项目中的类似代码工作正常，我会在这些天创建一个示例项目并写信给你，也许如果你显示所有代码你可以帮助我。谢谢。