FetchRequest - NSArray element failed to match the Swift Array Element type - Swift 2.0

Question

I want to do a NSFetchRequest to display my data into a UICollectionView :

import UIKit
import CoreData

let appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let context: NSManagedObjectContext = appDelegate.managedObjectContext
class GarageViewController: UIViewController, UICollectionViewDelegate,UICollectionViewDataSource {

@IBOutlet weak var backgroundView: UIImageView!

@IBOutlet weak var collectionView: UICollectionView!

var voitures: [Voiture]  = [Voiture]()

override func viewDidLoad() {
    super.viewDidLoad()

    collectionView.reloadData()

    let fetchRequest = NSFetchRequest(entityName: "Voiture")
    fetchRequest.resultType = .DictionaryResultType

    do {
        try voitures = context.executeFetchRequest(fetchRequest) as! [Voiture]
    }
    catch let fetchError as NSError {
        print("VoitureFetch error: \(fetchError.localizedDescription)")
    }

    if (voitures.count > 0) {
        for voiture in voitures as [Voiture] {

            print(voiture.nom!)

        }
    }
    else {
        print("Aucune voiture")
    }

}

When I run the code I get that error :

fatal error: NSArray element failed to match the Swift Array Element type

Thank's for your help !

What is in the array returned by the fetch request. It isn't Voiture objects. It is probably NSManagedObject instances. — Paulw11
– Paulw11, Commented Jul 8, 2015 at 22:10
You can answer your own question (instead of posting Solution in your question), makes things easier for people stumbling on this in the future. — sbarow
– sbarow, Commented Jul 17, 2015 at 9:15

muneeb · Accepted Answer · 2015-09-06 22:03:59Z

15

I had the same problem. The issue was due to not setting the class property for the entity in model file.

answered Sep 6, 2015 at 22:03

muneeb

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2 Comments

Dave Thomas Over a year ago

Cool thanks for pointing this out. Also needed this post stackoverflow.com/questions/26613971/… to get it working for me. I had to include @objc(ClassName)

Akshar Patel Over a year ago

In Addition to this, after setting the class name, set the module name to "Current Product Module".

Antonio · Accepted Answer · 2015-07-18 11:33:21Z

3

Solution

var voitures: [NSManagedObject]?  = [NSManagedObject]()


if (voitures!.count > 0) {

        let voiture: NSManagedObject = voitures![indexPath.row]

        print((voiture.valueForKey("nom") as? String))
    }

answered Jul 18, 2015 at 11:33

Antonio

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