崩溃时保存在设备上更改数据模型

Question

我一直在追捕的最后四小时后的解决方案，我在绝望中张贴。我的应用程序在模拟器，我的iPhone和我的iPad上工作完美，直到我为我的某个数据模型添加了一个属性。

我的iPhone应用程序使用核心数据和iCloud中。在AppDelegate中，我通过合并两个模型来创建managedObjectModel。一切似乎都很好，直到我试图保存ManagedObjectContext。这是当它与崩溃：

*终止应用程序由于未捕获的异常“NSInternalInconsistencyException”，理由是：“这 NSPersistentStoreCoordinator没有持久性存储。它不能 执行保存操作。'

这不会发生在模拟器上。

我曾尝试：

• 项目 - >干净生成文件夹
• 项目 - >清洁
• 从我 设备
• 删除从我的iCloud icloud的数据备份
删除app
• 重新启动计算机
• 改“.momd”到“.mom”，然后再返回（在另一个问题读到它）

感谢您的帮助。

编辑添加代码：

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { 
if (__persistentStoreCoordinator != nil) { 
    return __persistentStoreCoordinator; 
} 

__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];  
NSPersistentStoreCoordinator *psc = __persistentStoreCoordinator; 

// TODO: Set up iCloud in another thread: 
//dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
NSString *dataFileName = [NSString stringWithFormat:@"%@.sqlite", APP_TITLE_NO_SPACES]; 

NSString *iCloudDataDirectoryName = @"Data.nosync"; 
NSString *iCloudLogsDirectoryName = @"Logs"; 
NSFileManager *fileManager = [NSFileManager defaultManager];   
NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName]; 
NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil]; 

if (iCloud) { 
    NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]]; 
    if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) { 
     NSError *fileSystemError; 
     [fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName] 
       withIntermediateDirectories:YES 
           attributes:nil 
            error:&fileSystemError]; 
     if(fileSystemError != nil) { 
      NSLog(@"Error creating database directory %@", fileSystemError); 
     } 
    } 

    NSString *iCloudData = [[[iCloud path] 
          stringByAppendingPathComponent:iCloudDataDirectoryName] 
          stringByAppendingPathComponent:dataFileName]; 

    NSLog(@"iCloudData = %@", iCloudData); 

    NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys: 
          [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, 
          [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, 
          CLOUD_CONTAINER_IDENTIFIER, NSPersistentStoreUbiquitousContentNameKey, 
          iCloudLogsPath, NSPersistentStoreUbiquitousContentURLKey, nil]; 

    [psc lock]; 
    [psc addPersistentStoreWithType:NSSQLiteStoreType 
         configuration:nil 
           URL:[NSURL fileURLWithPath:iCloudData] 
          options:options 
           error:nil]; 
    [psc unlock]; 
} else { 
    NSLog(@"iCloud is NOT working - using a local store"); 
    NSMutableDictionary *options = [NSMutableDictionary dictionary]; 
    [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption]; 
    [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption]; 

    [psc lock]; 

    [psc addPersistentStoreWithType:NSSQLiteStoreType 
         configuration:nil 
           URL:localStore 
          options:options 
           error:nil]; 
    [psc unlock]; 
} 
__persistentStoreCoordinator = psc; 

[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ICLOUD_SOMETHING_CHANGED object:nil]; 

return __persistentStoreCoordinator; 

}

Answer 1

通常情况下，它应该删除的程序数据之后还好。但是，错误表明，您没有不一致性，但根本没有商店。假设：如果发生故障，您不会重新启动它。也许，下面的代码可能很有用：

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator 

{ 
    if (__persistentStoreCoordinator != nil) { 
     return __persistentStoreCoordinator; 
    } 
    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"myApp.sqlite"]; 

    NSError *error = nil; 
    __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; 
    if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) { 
     // Error, erase data 
     [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]; 
     NSLog(@"store cleaned"); 
     __persistentStoreCoordinator = nil; 
     return [self persistentStoreCoordinator]; 
    }  
    return __persistentStoreCoordinator; 
}