标签: afincrementalstore

在我的iOS应用程序中,我试图从(RESTful)服务器获取和发布数据.我认为RestKit和AFIncrementalStore都是不错的选择.但是,我还需要能够脱机保存数据并在应用程序联机时将其推送到服务器.

我试图了解哪个是一个更好的框架用于应用程序.

此外,从一些在线资源中,似乎在AFIncrementalStore上使用故障可能会导致处理ManagedContext(通常是mainThread)的线程在提供网络请求以获取属性时卡住.这是一个大问题吗？

PS:添加afnetworking标签,因为afincrementalstore标签不可用

我创建一个类别对象并保存它:

    NSManagedObjectContext *managedObjectContext = [[FTAppDelegate sharedAppDelegate] managedObjectContext];

    _category = (Category *)[NSEntityDescription
                             insertNewObjectForEntityForName:@"Category"
                             inManagedObjectContext:managedObjectContext];

    NSError *error = nil;
    [managedObjectContext save:&error];
    if (error) {
        NSLog(@"error saving: %@",error);
    }

然后编辑类别对象的名称并再次保存.

    _category.name = _nameTextField.text;

    NSManagedObjectContext *managedObjectContext = [[FTAppDelegate sharedAppDelegate] managedObjectContext];

    NSError *error = nil;
    [managedObjectContext save:&error];
    if (error) {
        NSLog(@"error saving: %@",error);
    }

并得到此错误:

 2013-01-12 17:53:11.862 instacat[7000:907] Unresolved error Error Domain=NSCocoaErrorDomain Code=134030 "The operation couldn’t be completed. (Cocoa error 134030.)" UserInfo=0x2027b300 {NSAffectedObjectsErrorKey=(
"<Category: 0x1ed43cf0> (entity: Category; id: 0x1ed52970 <x-coredata://68E5D7B6-D461-4962-BC07-855349DB3263-7000-00000141BAB4C399/Category/tE8AB2F2E-C14C-4E93-8343-CC245B7726622> ; data: {\n    categoryId = …

我正在使用NSPrivateQueueConcurrencyType并发类型运行冻结(死锁？)而不是NSMainQueueConcurrencyType.

我的上下文初始化

_managedObjectContext = [[NSManagedObjectContext alloc] 
initWithConcurrencyType:NSPrivateQueueConcurrencyType];  
[_managedObjectContext setPersistentStoreCoordinator:coordinator];

麻烦的代码:

NSManagedObjectID *managedObjectID = [self managedObjectIDForEntity:entity 
withParseObjectId:object.objectId];  
managedObject = [context existingObjectWithID:managedObjectID error:error];

回溯:

链接到Github 项目并针对该问题的某些上下文打开问题.

你如何映射AFIncrementalStore到Twitter API v1.1？

AFNetworking的核心数据持久性,完成正确

https://github.com/AFNetworking/AFIncrementalStore

REST API v1.1资源

https://dev.twitter.com/docs/api/1.1

- (id)representationOrArrayOfRepresentationsOfEntity:(NSEntityDescription *)entity
                                  fromResponseObject:(id)responseObject;

- (NSDictionary *)representationsForRelationshipsFromRepresentation:(NSDictionary *)representation
                                                           ofEntity:(NSEntityDescription *)entity
                                                       fromResponse:(NSHTTPURLResponse *)response;

- (NSString *)resourceIdentifierForRepresentation:(NSDictionary *)representation
                                         ofEntity:(NSEntityDescription *)entity
                                     fromResponse:(NSHTTPURLResponse *)response;

- (NSDictionary *)attributesForRepresentation:(NSDictionary *)representation
                                     ofEntity:(NSEntityDescription *)entity
                                 fromResponse:(NSHTTPURLResponse *)response;

- (NSMutableURLRequest *)requestForFetchRequest:(NSFetchRequest *)fetchRequest
                                    withContext:(NSManagedObjectContext *)context;

- (NSMutableURLRequest *)requestWithMethod:(NSString *)method
                       pathForObjectWithID:(NSManagedObjectID *)objectID
                               withContext:(NSManagedObjectContext *)context;

- (NSMutableURLRequest *)requestWithMethod:(NSString *)method
                       pathForRelationship:(NSRelationshipDescription *)relationship
                           forObjectWithID:(NSManagedObjectID *)objectID
                               withContext:(NSManagedObjectContext *)context;

假设我使用了Core Data模型AFIncrementalStore,并且我有多个REST API端点用于检索该模型的对象列表.我可以覆盖-requestForFetchRequest:withContext:在AFHTTPClient像这样:

- (NSURLRequest *)requestForFetchRequest:(NSFetchRequest *)fetchRequest
                         withContext:(NSManagedObjectContext *)context {

    NSMutableURLRequest *mutableURLRequest = nil;
    if ([fetchRequest.entityName isEqualToString:@"Post"]) {
        mutableURLRequest = [self requestWithMethod:@"GET" path:@"/posts/foo" parameters:nil];
    }
    return mutableURLRequest;
}

在这个片段中,我检索Post对象/posts/foo,但我还需要从中检索另一个集合/posts/bar.

我怎样才能做到这一点？我看到的唯一解决方案是制作两个模型:一个用于foo和一个用于bar,但重复自己是蹩脚的,并且可能有更多的API端点Post为我提供了我需要支持的对象.我还缺少一些其他方法吗？

我一直想知道如果我要将AFIncrementalStore和Magical Record结合起来,生活会怎样.我只是不知道如何将增量存储设置为魔法记录存储.有谁知道如何进行这样的操作？