Ios 使用NSBatchInsertRequest的CoreData

我正试图使用

NSBatchInsertRequest

根据WWDC 2019（）在

CoreData

中插入字典数组。insertResult为零，我的CoreData为空

let modelURL = Bundle.main.url(forResource: "CoreDataPerformance", withExtension: "momd")!
let model = NSManagedObjectModel(contentsOf: modelURL)!
let container = NSPersistentCloudKitContainer(name: "CoreDataPerformance", managedObjectModel: model)
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
    if let error = error as NSError? {
        fatalError("Unresolved error \(error), \(error.userInfo)")
    }
})

try container.viewContext.setQueryGenerationFrom(.current)

let moc = container.viewContext
moc.automaticallyMergesChangesFromParent = true
moc.perform {
    let insertRequest = NSBatchInsertRequest(entity: Client.entity(), objects: clients)
    let insertResult = try? moc.execute(insertRequest) as? NSBatchInsertRequest
    let success = insertResult?.resultType
    print("RESULT STATUS: \(success)")
}

这是我在控制台中收到的错误：

2020-02-04 18:30:25.800705+0200 CoreDataPerformance[62836:778869] [error] warning: Multiple NSEntityDescriptions claim the NSManagedObject subclass 'CoreDataPerformance.Client' so +entity is unable to disambiguate.

CoreData: warning: Multiple NSEntityDescriptions claim the NSManagedObject subclass 'CoreDataPerformance.Client' so +entity is unable to disambiguate.

2020-02-04 18:30:25.800846+0200 CoreDataPerformance[62836:778869] [error] warning:   'Client' (0x600000c50bb0) from NSManagedObjectModel (0x600001877480) claims 'CoreDataPerformance.Client'.

CoreData: warning:   'Client' (0x600000c50bb0) from NSManagedObjectModel (0x600001877480) claims 'CoreDataPerformance.Client'.

2020-02-04 18:30:25.800940+0200 CoreDataPerformance[62836:778869] [error] warning:   'Client' (0x600000c589a0) from NSManagedObjectModel (0x600001861680) claims 'CoreDataPerformance.Client'.

CoreData: warning:   'Client' (0x600000c589a0) from NSManagedObjectModel (0x600001861680) claims 'CoreDataPerformance.Client'.

---

我认为WWDC的谈话有错误。尝试这样做：

let insertRequest = NSBatchInsertRequest(entity: Client.entity(), objects: clients)
try! moc.execute(insertRequest)
try! moc.save()

---

我用试试看这样我就可以看到任何错误。您可以更改它

您的行

let insertResult=try？主运行中心执行（插入请求）为？NSBatchInsertRequest

应该是：

---

let insertResult=try？主运行中心执行（插入请求）为？NSBatchInsertResult

消除歧义的问题是因为在应用程序运行时，有多个核心数据堆栈处于打开状态。这是因为你有你的应用程序和测试堆栈吗？或者因为您的应用程序正在使用多个？

错误

CoreData:警告：多个NSEntityDescriptions声明NSManagedObject子类“CoreDataPerformance.Client”so+实体无法消除歧义。

表示您的模型中有多个实体使用

客户端
NSManagedObject
子类，应该只有一个

代码的另一个问题是，来自父级的
automaticallyMergesChangesFromParent
无法处理批处理请求，因为未生成did save通知。您必须使用
NSPersistentStoreRemoteChangeNotification
、
NSPersistentHistoryChangeRequest
和
mergeChangesFromContextDidSaveNotification
该技术在@21:57
调用
moc的四行中进行了说明。执行
。。。您是否尝试在不嵌入此执行闭包的情况下运行这些操作？即删除对
perform
的调用？NSBatchInsertRequest将对象保存到持久存储中。我认为您不需要显式地保存上下文。