Core Data数据库条目丢失求助：Dime应用v2更新后新增交易消失

我是基于Core Data开发的开源财务追踪应用Dime的开发者。在近期的v2版本更新中，我对Core Data架构做了调整——使用DataController的静态共享实例替代每次使用时的初始化操作，以此添加AppIntents功能，否则会出现“加载了两个数据模型”的错误。但更新后，我每天都会收到2-3封用户邮件反馈，称新增的交易在几天后退出应用时消失。该问题并非所有用户都会遇到，且我无法自行复现此问题。

新Core Data架构及使用方式 #

代码实现 #

class DataController: ObservableObject {
    static let shared = DataController()

    var container = NSPersistentCloudKitContainer(name: "MainModel")

    init() {
        let description = NSPersistentStoreDescription()
        description.shouldMigrateStoreAutomatically = true
        description.shouldInferMappingModelAutomatically = true
        description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
        description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)

        let keyValueStore = NSUbiquitousKeyValueStore.default

        if keyValueStore.object(forKey: "icloud_sync") == nil {
            keyValueStore.set(true, forKey: "icloud_sync")
        }

        if !keyValueStore.bool(forKey: "icloud_sync") {
            description.cloudKitContainerOptions = nil
        } else {
            description.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.com.rafaelsoh.dime")
        }

        let groupID = "group.com.rafaelsoh.dime"

        if let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: groupID) {
            description.url = url.appendingPathComponent("Main.sqlite")
        }

        container.persistentStoreDescriptions = [description]

        container.loadPersistentStores { description, error in

            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo) for \(description)")
            }

            self.container.viewContext.automaticallyMergesChangesFromParent = true
        }
    }
}

使用方式 #

let dataController = DataController.shared

旧Core Data架构及使用方式（无交易丢失问题） #

代码实现 #

class DataController: ObservableObject {
    var container = NSPersistentCloudKitContainer(name: "MainModel")
    
    init() {
        let description = NSPersistentStoreDescription()
        description.shouldMigrateStoreAutomatically = true
        description.shouldInferMappingModelAutomatically = true
        
        description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
        
        description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
        
        if(!NSUbiquitousKeyValueStore.default.bool(forKey: "icloud_sync")){
            description.cloudKitContainerOptions = nil
        } else {
            description.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.com.rafaelsoh.dime")

        }
        
        
        let groupID = "group.com.rafaelsoh.dime"
        
        if let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: groupID) {
            description.url = url.appendingPathComponent("Main.sqlite")
        }
        
        container.persistentStoreDescriptions =  [description]
        
        container.loadPersistentStores { description, error in
            
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo) for \(description)")
            }
            
            self.container.viewContext.automaticallyMergesChangesFromParent = true
            
        }
    }
}

使用方式 #

struct dimeApp: App {
    @StateObject var dataController: DataController
    
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(\.managedObjectContext, dataController.container.viewContext)
                .environmentObject(dataController)
        }
    }
    
    init() {
        let dataController = DataController()
        _dataController = StateObject(wrappedValue: dataController)
    }
}

恳请各位提供技术帮助，非常感谢！

内容的提问来源于stack exchange，提问作者Rafael Soh