In Core Data, how to do `if exists update else insert` in swift 4?

Question

I am new in core data. i just want to check if a record exists in core data then update else insert. i can insert, fetch delete data but unable to update. Here is my piece of code

var context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var user = [Users]()
func insertData() {

    let newUser = NSEntityDescription.insertNewObject(forEntityName: "Users", into: context)//entity(forEntityName: "Users", in: context)
    newUser.setValue("chatt", forKey: "name")
    newUser.setValue("100", forKey: "balance")
    newUser.setValue("123", forKey: "user_id")
    do {

        try context.save()

    } catch {

        print("Failed saving")
    } 
}

Please help me with the update code snippet

You can reference my answer [here](https://stackoverflow.com/a/48089530/4079505) — Devbot10, Oct 01 '18 at 19:04
This has been incorrectly moderated - if it's a duplicate, please cite the duplicated answers. Devbot10's answer is an answer to a different question - how to update a previously existing core data object - that's not the answer to this question. — Nostradamus, May 12 '19 at 18:47

score 5 · Accepted Answer · edited Dec 23 '20 at 19:25

5

try this :

var fetchRequest = NSFetchRequest(entityName: "Users")
fetchRequest.predicate = NSPredicate(format: "userName = %@", userName)

if let fetchResults = appDel.managedObjectContext!.executeFetchRequest(fetchRequest, error: nil) as? [NSManagedObject] {
    if fetchResults.count != 0 {
        // update
        var managedObject = fetchResults[0]
        managedObject.setValue(accessToken, forKey: "accessToken")

        context.save(nil)
    } else {
        //insert as new data
    }
}

Cheers :)

edited Dec 23 '20 at 19:25

Jon Winstanley

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answered Mar 26 '18 at 07:32

Wendra

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5
7

Sir, it is showing NSFetchRequestResults has no member 'count' – Gorib Developer Mar 26 '18 at 07:44

In Core Data, how to do `if exists update else insert` in swift 4?

1 Answers1