批量删除请求使应用程序崩溃

Question

我有一个 InMemory Store Coordinator 声明如下：

lazy var ramStoreCoordinator: NSPersistentStoreCoordinator = {
    // The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    var failureReason = "There was an error creating or loading the application's saved data."
    do {
        try coordinator.addPersistentStoreWithType(NSInMemoryStoreType, configuration: nil, URL: nil, options: nil)
    } catch {
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason

        dict[NSUnderlyingErrorKey] = error as NSError
        let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
        abort()
    }

    return coordinator
}()

以及关联的 ManagedObjectContext：

lazy var ramManagedObjectContext: NSManagedObjectContext = {
    // Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
    let coordinator = self.ramStoreCoordinator
    var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
    managedObjectContext.persistentStoreCoordinator = coordinator
    managedObjectContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
    return managedObjectContext
}()

我正在尝试像这样执行获取请求：

    let fetchRequest = NSFetchRequest(entityName: "Post")
    let batchDelete = NSBatchDeleteRequest(fetchRequest: fetchRequest)
    do {
        // Execute Batch Request
        try ramManagedObjectContext.executeRequest(batchDelete)
    } catch {
        let updateError = error as NSError
        print("\(updateError), \(updateError.userInfo)")
    }

行：

try ramManagedObjectContext.executeRequest(batchDelete)

应用程序崩溃，输出如下：

2016-04-30 23:47:40.271 Secret[2368:1047869] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unknown command type (entity: EntityName; predicate: ((null)); sortDescriptors: ((null)); type: NSManagedObjectIDResultType; ) >' * First throw call stack: (0x18145ae38 0x180abff80 0x1833710b0 0x18338991c 0x183391d64 0x101121a3c 0x10112d5f0 0x1833845bc 0x1832c1d5c 0x183354e04 0x10011abc4 0x10011947c 0x100092bf0 0x10009269c 0x1000926ec 0x186a1aac0 0x186a1b258 0x186901854 0x186904a4c 0x1866d4fd8 0x1865e0014 0x1865dfb10 0x1865df998 0x183f4da20 0x101121a3c 0x1011274e4 0x181410dd8 0x18140ec40 0x181338d10 0x182c20088 0x18660df70 0x1000fcba8 0x180ed68b8) libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

NSBatchDeleteRequest 应该在您的 ramStoreCoordinator 上执行，而不是 ramManagedObjectContext，因为它直接与 NSPersistenceStore class 实例一起工作：

try persistentStoreCoordinator.executeFetchRequest(batchDelete, withContext: ramManagedObjectContext)

查看此 link 了解更多详情： https://developer.apple.com/videos/play/wwdc2015/220/

希望对您有所帮助）

Answer 2

我遇到了完全相同的问题。通过将内存存储更改为 NSSQLiteStoreType 来解决它。尚未对内存存储中发生这种情况的原因进行任何研究，但希望能解决您的问题。

Answer 3

当您在 XCode 之外重命名某些文件时，可能会发生此错误。要解决这个问题，您只需从您的项目中删除文件（右键单击 - 删除和 "Remove Reference"）您重新导入项目中的文件，一切都会好起来的！

如果没有解决，试试这个

try persistentStoreCoordinator.executeFetchRequest(
    batchDelete, withContext:context
)

因为 NSBatchDeleteRequest 在持久存储协调器上执行，而不是在托管对象上下文上执行。

Answer 4

根据我的经验，NSBatchDeleteRequest 不适用于 NSInMemoryStoreType。我正在尝试同样的方法来测试我的方法，但我将不得不对此有所保留。

编辑：

添加 Marcus Zarra's 推文作为证明。

批量删除请求使应用程序崩溃

Batch delete request crashes app

core-data

ios

swift

ios9