PersistenceController and CloudKit

Question

Jad-T OP

Created Aug ’21

Replies 3

Boosts 0

Views 2.1k

Participants 3

Hello

I am making a To-Do list app where I use CoreData and CloudKit, the problem is that when I added this line of code

 container.persistentStoreDescriptions = [NSPersistentStoreDescription(url: fileContainer.appendingPathComponent("MJ.sqlite"))]

to the PersistenceController, iCloud syncing stopped working. (I need that line of code in order to permit to extensions to access the CoreData database)

Any idea to solve the problem?

This is all the PersistenceController code

struct PersistenceController {
    static let shared = PersistenceController()


    let container: NSPersistentCloudKitContainer

    init(inMemory: Bool = false) {
        container = NSPersistentCloudKitContainer(name: "MJ")
        
        guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.name") else {
            fatalError("Shared file container could not be created.")
        }
        
        container.persistentStoreDescriptions = [NSPersistentStoreDescription(url: fileContainer.appendingPathComponent("MJ.sqlite"))]
        
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        
        container.viewContext.automaticallyMergesChangesFromParent = true
        container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy

    }
}

Thank you!

Answered by Jad-T in 698741022

struct PersistenceController {
    static let shared = PersistenceController()
    
    let container: NSPersistentCloudKitContainer
    
    init() {
        container = NSPersistentCloudKitContainer(name: "MJ")
        
        guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.Jad.MJ")?.appendingPathComponent("MJ.sqlite") else {
            fatalError("Shared file container could not be created.")
        }
        
        
        let storeDescription = NSPersistentStoreDescription(url: fileContainer)
        storeDescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
        storeDescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
        storeDescription.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "YOUR containerIdentifier")
        
        
        container.persistentStoreDescriptions = [storeDescription]
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        
        container.viewContext.automaticallyMergesChangesFromParent = true
        container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
        
    }
}

Boost

Answer 1

J0hn OP

Aug ’21

Not sure what the "right answer" is, but This is how I set mine up.

       let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "APPGROUPID")?.appendingPathComponent("NAME.sqlite")

        let description = NSPersistentStoreDescription(url: url)
        description.shouldMigrateStoreAutomatically = true
        description.shouldInferMappingModelAutomatically = false // yours should probably be true if you're not manually migrating between schema versions
        description.shouldAddStoreAsynchronously = true
        description.isReadOnly = false

        let options = NSPersistentCloudKitContainerOptions(containerIdentifier: "MY IDENTIFIER")
        description.cloudKitContainerOptions = options

        return description

0

Answer 2

Jad-T OP

Aug ’21

Your code makes CloudKit work but stops the widget extension from connecting to the CoreData Database. Thank you for your time.

0

Answer 3

Jad-T OP

Dec ’21

Accepted Answer

struct PersistenceController {
    static let shared = PersistenceController()
    
    let container: NSPersistentCloudKitContainer
    
    init() {
        container = NSPersistentCloudKitContainer(name: "MJ")
        
        guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.Jad.MJ")?.appendingPathComponent("MJ.sqlite") else {
            fatalError("Shared file container could not be created.")
        }
        
        
        let storeDescription = NSPersistentStoreDescription(url: fileContainer)
        storeDescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
        storeDescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
        storeDescription.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "YOUR containerIdentifier")
        
        
        container.persistentStoreDescriptions = [storeDescription]
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        
        container.viewContext.automaticallyMergesChangesFromParent = true
        container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
        
    }
}

0