更新核心数据模型后出错 - 无法识别的选择器发送到实例

Question

添加一个名为Unique Identifiermy Enitiy/ NSManagedObjectcalled 的字符串属性后,我收到以下错误Labels.然而,并不是Unique Identifier编制者不满意的.

2016-08-20 02:20:08.394 AN [22499:8730414] - [AN.Labels文件夹]:无法识别的选择器发送到实例0x7ffe907e1a80 2016-08-20 02:20:08.405 AN [22499:8730414]***终止应用程序由于未捕获的异常'NSInvalidArgumentException',原因:' - [AN.Labels文件夹]:无法识别的选择器发送到实例0x7ffe907e1a80'

这是我的NSManagedObject类

class Labels: NSManagedObject {

    @NSManaged var title: String?
    @NSManaged var details: String
    @NSManaged var date: NSDate?
    @NSManaged var uniqueIdentifier: NSString?

    @NSManaged var arrayOfFolders: [Folders]
    @NSManaged var folder: Folders?
    @NSManaged var folders: NSSet

    override func awakeFromFetch() {
        super.awakeFromFetch()
        self.regenerateFolders()
    }

    func regenerateFolders() {
        let date = NSSortDescriptor(key: "date", ascending: false)
        if let array = folders.sortedArrayUsingDescriptors([date]) as? [Folders] {
            self.arrayOfFolders = array
        }
    }    
}

我确保应用程序使用新coreData模型并在我的CoreData堆栈中包含以下内容.我有一段时间没有遇到这个问题,因为我的应用程序会自动更新以使用最新的核心数据模型.

var storeDirectoryURL: NSURL {
    return try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
}

var storeURL: NSURL {
    return self.storeDirectoryURL.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
}

func setupCoreData() {
    let modelURL = NSBundle.mainBundle().URLForResource("AN", withExtension: "momd")
    let model = NSManagedObjectModel(contentsOfURL: modelURL!)

    try! NSFileManager.defaultManager().createDirectoryAtURL(self.storeDirectoryURL, withIntermediateDirectories: true, attributes: nil)

    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model!)
    let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true]
    try! coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: self.storeURL, options: options)

    managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
    managedObjectContext.persistentStoreCoordinator = coordinator
    managedObjectContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy   
}

有人有什么建议吗？

Answer 1

检查核心数据模型中标签和文件夹之间的关系。您可能会将逆关系命名为“标签”以外的名称。