Question

我正在为服务器的后台长时间节省创建一个新的NSPersistentStoreCoordinator。它工作正常但突然我看到生产中的崩溃，出现以下错误 -

CRASH_INFO_ENTRY_0 致命错误：后台上下文创建失败，错误错误Domain = NSCocoaErrorDomain Code = 134110＆＃34;持久存储迁移期间发生错误。＆＃34; UserInfo = {sourceURL = file：///var/mobile/Containers/Data/Application/8EF27C05-1755-49EE-B174-8B163CC7CC1D/Documents/App.sqlite，reason =无法迁移存储：尝试迁移期间的约束违规，destinationURL = file：///var/mobile/Containers/Data/Application/8EF27C05-1755-49EE-B174-8B163CC7CC1D/Documents/.App.sqlite.migrationdestination_41b5a6b5c6e848c462a8480cd24caef3,NSUnderlyingError = 0x170a56290 {Error Domain = NSCocoaErrorDomain Code = 134111＆＃ 34;（NULL）＆＃34; UserInfo = {reason =在尝试迁移期间违反约束，NSUnderlyingException =约束违规，_NSCoreDataOptimisticLockingFailureConflictsKey =（＆＃34;＆＃34;）}}}：file /Users/*******/Desktop/7.50/APPS/ LTG / project / modelBase / db / DatabaseManager.swift，第67行

Lookalike我有一个约束问题，因为这是我得到的错误 -

NSMigrationConstraintViolationError = 134111，// 由于违反唯一性约束，迁移失败

Bu，因为_NSCoreDataOptimisticLockingFailureConflictsKey is <null>我无法追踪问题。

这是我的代码 -

    lazy var backgroundSyncContext:NSManagedObjectContext =  {
        let psc = NSPersistentStoreCoordinator(managedObjectModel: NSManagedObjectModel.MR_defaultManagedObjectModel()!)
        let context = NSManagedObjectContext(concurrencyType: NSManagedObjectContextConcurrencyType.PrivateQueueConcurrencyType)
        context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
        context.undoManager = nil
        context.persistentStoreCoordinator = psc
        let mOptions = [NSMigratePersistentStoresAutomaticallyOption: true,
        NSInferMappingModelAutomaticallyOption: true]

        let paths = NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)
        let applicationDocumentURL = paths.last!.absoluteString?.stringByReplacingOccurrencesOfString("%20", withString: " ")
        let documentPath = paths.last!

        let storeUrl = documentPath.URLByAppendingPathComponent("Prep4\(AppConfig.sharedInstance.examName).sqlite")

        do {

            try context.persistentStoreCoordinator?.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: storeUrl, options: mOptions)
            print("Created background context")

        } catch (let error){

            fatalError("Background context creation failed with error \(error)")
        }

        return context

    }()

修改

好的，我有一个猜测 - 是我为模型添加约束的最新版本。是否有可能用户设备上的旧版本包含对新约束无效的重复项，因此迁移失败。

这听起来合理吗？

由于沙尼

迁移时CoreData因NSMigrationConstraintViolationError = 134111错误而崩溃

0 个答案: