How do you update a CoreData entry that has already been saved in Swift?

Question

I\'m not sure what I\'m doing wrong here, but when I save the first time into coredata, it works just fine. When I try to overwrite that, it doesn\'t.

func t         


        

Answer 1

Swift >= 2 the method now returns a non-optional and throws an error in the error case, which must be handled with try-catch:

    let context = self.fetchedResultsController.managedObjectContext
    let entity = self.fetchedResultsController.fetchRequest.entity!

    let fetchRequest = NSFetchRequest(entityName:entity.name!)
    fetchRequest.predicate = NSPredicate(format: "notificationId = 13")

    do {
        let list = try context.executeFetchRequest(fetchRequest) as? [NSManagedObject]
        if list!.count == 0 // Check notificationId available then not save
        {
            let newManagedObject = NSEntityDescription.insertNewObjectForEntityForName(entity.name!, inManagedObjectContext: context)
            newManagedObject.setValue("This is first message13", forKey: "message")
            newManagedObject.setValue(1, forKey: "appId")
            newManagedObject.setValue(13, forKey: "notificationId")
            newManagedObject.setValue("First one", forKey: "tital")
        }
        // success ...
    } catch let error as NSError {
        // failure
        print("Fetch failed: \(error.localizedDescription)")
    }