核心数据：实体不是密钥的密钥值编码

Question

我的xcdatamodeld中有六个实体。文章，部分，参考，书签，书签参考和书签部分。我试图将书签文章单独保存到书签实体。文章具有与章节和引用相反的逆设置书签与BookmarkReferences和BookmarkSections的逆设置。当我尝试将文章NSManagedObject中的值设置为书签NSManagedObj时，我收到KVC错误。我确保密钥名称中没有拼写错误。看看代码和日志。

 extension Bookmarks {
     @nonobjc public class func fetchRequest() -> NSFetchRequest<Bookmarks> {
         return NSFetchRequest<Bookmarks>(entityName: "Bookmarks");
     }
     @NSManaged public var id: String?
     @NSManaged public var status: String?
     @NSManaged public var createdBy: String?
     @NSManaged public var articleType: String?
     @NSManaged public var modifiedBy: String?
     @NSManaged public var tag: String?
     @NSManaged public var sendNotification: Bool
     @NSManaged public var bookmark: Bool
     @NSManaged public var isRead: Bool
     @NSManaged public var isArticleFromSearch: Bool
     @NSManaged public var searchString: String?
     @NSManaged public var isArticleFromCategory: Bool
     @NSManaged public var modifiedDate: String?
     @NSManaged public var createdDate: String?
     @NSManaged public var category: String?
     @NSManaged public var subCategory: String?
     @NSManaged public var title: String?
     @NSManaged public var general: NSDictionary?
     @NSManaged public var bookmarkSections: NSSet?
     @NSManaged public var bookmarkReferences: NSSet?
}

extension BookmarkSections {
    static func saveSectionsForBookmarks(entity: Article, privateContext: NSManagedObjectContext) -> NSSet {
        let sections = entity.sections
        let sectionED = NSEntityDescription.entity(forEntityName: "BookmarkSections", in: privateContext)
        let sectionMO = NSManagedObject(entity: sectionED!, insertInto: privateContext)
        let sectionsSet = NSMutableSet()
        let allSectionItems = sections?.allObjects
        for (_, sectionItem) in (allSectionItems?.enumerated())! {
            let castedSection = sectionItem as? Sections
            sectionMO.setValue(castedSection!.id, forKey: "id")
            sectionMO.setValue(castedSection!.text, forKey: "text")
            sectionMO.setValue(castedSection!.imageUrl, forKey: "imageUrl")
            sectionMO.setValue(castedSection!.imageName, forKey: "imageName")
            sectionMO.setValue(castedSection!.title, forKey: "title")
            sectionsSet.add(sectionMO)
        }
        return sectionsSet
    }
}
[`    
extension Bookmarks {
    public static func saveToNew(Entity: Article) {
    let managedContext = CoreDataStorage.sharedInstance.privateQueueContext
    let entityDesc =
        NSEntityDescription.entity(forEntityName: "Bookmarks",
                                   in: managedContext)!
    let articleMO = NSManagedObject(entity: entityDesc,
                                  insertInto: managedContext)
    articleMO.setValue(Entity.id, forKey: "id")
    articleMO.setValue(Entity.status, forKey: "status")
    articleMO.setValue(Entity.createdBy, forKey: "createdBy")
    articleMO.setValue(Entity.articleType, forKey: "articleType")
    articleMO.setValue(Entity.modifiedBy, forKey: "modifiedBy")
    let isSendNotification=NSNumber(value: false)     
    articleMO.setValue(isSendNotification, forKey: "sendNotification")

    let modifiedDate = String(describing: Entity.modifiedDate)
    articleMO.setValue(modifiedDate, forKey: "modifiedDate")

    let createdDate = String(describing: Entity.createdDate)
    articleMO.setValue(createdDate, forKey: "createdDate")

    articleMO.setValue(Entity.category, forKey: "category")
    articleMO.setValue(Entity.subCategory, forKey: "subCategory")

    let general = NSMutableDictionary()
    let dict = Entity.general

    for (key,subJson):(Any, Any) in dict! {
        general.setValue(subJson as! String, forKey: key as! String)
    }
    articleMO.setValue(general, forKey: "general")

    articleMO.setValue(Entity.title, forKey: "title")

    articleMO.setValue(BookmarkSections.saveSectionsForBookmarks(entity: Entity, privateContext: managedContext), forKey: "bookmarkSections")

    articleMO.setValue(Entity.references, forKey: "references")
    do {
        try managedContext.save()
    } catch let error as NSError {
        print("Could not save. \(error), \(error.userInfo)")
    }

}    
`]

错误：