ios - RESTKit:RKManagedObjectStore & 删除数据

Question

下面是我必须设置 ObjectStore 的代码，它工作正常。

- (RKManagedObjectStore *)setupCoreDataWithRESTKit{
    NSError * error;
    NSURL * modelURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"app" ofType:@"momd"]];
    NSManagedObjectModel * managedObjectModel = [[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL] mutableCopy];
    self.managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];

    [self.managedObjectStore createPersistentStoreCoordinator];

    NSArray * searchPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * documentPath = [searchPaths objectAtIndex:0];
    NSPersistentStore * persistentStore = [self.managedObjectStore addSQLitePersistentStoreAtPath:[NSString stringWithFormat:@"%@/app.sqlite", documentPath] fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);

    if(!persistentStore){
        NSLog(@"Failed to add persistent store: %@", error);
    }

    [self.managedObjectStore createManagedObjectContexts];
    return self.managedObjectStore;
}

- (id)optionsForSqliteStore {
    return @{
             NSInferMappingModelAutomaticallyOption: @YES,
             NSMigratePersistentStoresAutomaticallyOption: @YES
             };
}

问题 1:我需要多久调用一次这段代码？首次启动应用程序时仅一次？还是每次启动应用程序？或者当我需要访问商店时每次发布仅一次？

问题 2:我缓存每个用户的数据。如果用户退出应用程序，我想删除所有数据/对象(或数据存储区？)，关于执行此操作的最佳做​​法有什么建议吗？

Answer 1

How often do I need to call this code?

每次启动应用程序

I cache the data per User. If the User logs out of the app, I would like to delete all of the data/objects (or the datastore?), any suggestion on what's the best practice to do this?

如果要删除所有内容，则销毁托管对象上下文和存储协调器，并从磁盘中删除 SQLite 文件。

如果你只想删除一些东西，那么从上下文中删除托管对象并保存上下文(和持久存储)。