Core data + CloudKit - sharing between iOS and watchOS companion app

Question

In my app I store data with core data. Recently I discovered the new feature introduced by Apple in WWDC19 which allows core data to work with CloudKit. I just enabled cloudKit

Answer 1

Resolved by adding a cloudKitContainerOptions to my context description like this :

class CoreDataStack {
    static let persistentContainer: NSPersistentCloudKitContainer = {
        let container = NSPersistentCloudKitContainer(name: "MyProjectName")
        let description = container.persistentStoreDescriptions.first

        description?.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "myCloudContainerID") // HERE !

        container.loadPersistentStores(completionHandler: { (_, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()  

}