Migrate to app group

migrate.swift

// In my core data stack
let container = NSPersistentCloudKitContainer(name: "DataModel")
let storeUrl = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: groupIdentifier)!.appendingPathComponent("DataModel.sqlite")

// Enable history tracking and remote notifications
guard let description = container.persistentStoreDescriptions.first else {
    fatalError("###\(#function): Failed to retrieve a persistent store description.")
}
description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
let defaultUrl = description.url
description.url = storeUrl

if let oldStoreUrl = defaultUrl, FileManager.default.fileExists(atPath: oldStoreUrl.path) {
    self.migrateStoreToAppGroup(oldStoreUrl: oldStoreUrl, storeUrl: storeUrl)
}

// and...

private func migrateStoreToAppGroup(oldStoreUrl: URL, storeUrl: URL) {
    let url = Bundle.main.url(forResource: "DataModel", withExtension: "momd")!
    let managedObjectModel = NSManagedObjectModel(contentsOf: url)!
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel)
    do {
        try coordinator.replacePersistentStore(at: storeUrl, destinationOptions: [
            NSPersistentHistoryTrackingKey: true,
            NSPersistentStoreRemoteChangeNotificationPostOptionKey: true
            ], withPersistentStoreFrom: oldStoreUrl, sourceOptions: [
                NSPersistentHistoryTrackingKey: true,
                NSPersistentStoreRemoteChangeNotificationPostOptionKey: true
        ], ofType: NSSQLiteStoreType)
        try FileManager.default.removeItem(at: oldStoreUrl)
    } catch {
        Logging.logError(error)
    }
}