我正在使用RestKit作为应用程序的后端。 一切都运行良好,但是我遇到了在本地删除后获取未经更改的数据的问题。
这是路径匹配:
[self.objectManager addFetchRequestBlock:^NSFetchRequest *(NSURL *URL) {
RKPathMatcher *pathMatcher = [RKPathMatcher pathMatcherWithPattern:@"cards"];
if([pathMatcher matchesPath:[URL relativePath] tokenizeQueryStrings:NO parsedArguments:nil])
return [NSFetchRequest fetchRequestWithEntityName:@"Card"];
return nil;
}];
当API响应缺少一个本地对象时,删除正在传播。
然而,当执行本地删除时,如:
for(NSManagedObject *entity in cards) {
[RKManagedObjectStore.defaultStore.mainQueueManagedObjectContext deleteObject:card];
如果再次执行/ cards fetch请求,如果刚刚在CoreData中删除的对象没有更改,则不会更新卡。在应用程序重新启动或API响应中包含新对象之前,情况仍然如此。
即使服务器返回正确的JSON,RKMappingResult仍为空:
2013-07-03 17:58:00.732 Thanx[76837:c07] I restkit.network:RKHTTPRequestOperation.m:185 GET 'http://api.thanx-web.dev/v2/cards' (200 OK) [0.1086 s]
2013-07-03 17:58:00.734 Thanx[76837:c07] <RKMappingResult: 0xac9b080, results={
"<null>" = (
);
}>
2013-07-03 17:58:00.734 Thanx[76837:c07] <RKManagedObjectRequestOperation: 0xbb32250, state: Successful, isCancelled=NO, request: <NSMutableURLRequest http://api.thanx-web.dev/v2/cards>, response: <NSHTTPURLResponse: 0xbb42060 statusCode=200 MIMEType=application/json length=201>>
我有什么办法可以解决这个问题吗?这似乎是某种缓存问题。但是,即使在本地删除后立即运行[RKManagedObjectStore.defaultStore resetPersistentStores:nil]
功能似乎也无法解决此问题。
感谢您的帮助,
的Darren
编辑 - 以下是适用的模型映射:
RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:@"Card" inManagedObjectStore:self.objectManager.managedObjectStore];
// enable validations
mapping.performKeyValueValidation = YES;
// if validation fails, skip object rather than entire request
mapping.discardsInvalidObjectsOnInsert = YES;
// add json-to-model mappings
[mapping addAttributeMappingsFromArray:@"card_id", @"last4", @"name"];
标识属性默认为card_id
,因此不会手动指定。
谢谢!
答案 0 :(得分:0)
实际上,您必须从persistentstore中获取数据,而不是从当前创建的托管上下文中获取数据。我的意思是[RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"MyModel"];
NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"id" ascending:NO];
fetchRequest.sortDescriptors = @[descriptor];
// Setup fetched results
NSFetchedResultsController *fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
managedObjectContext:[RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext
sectionNameKeyPath:nil
cacheName:nil];
// AND TO DELETE A MODEL :
[[RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext deleteObject:myobject];