CODEWITHSUNDEEP
ioscore-dataswift3nsfetchedresultscontroller
Chandan kumar
Chandan kumar

Reputation: 1084

NSFetchedResultsController fetchedObjects returning nil

I used below code fetch the list of Article from core data and it is giving me the expected result. 

    let moc = CoreDataHelper().backgroundContext
    let employeesFetch = NSFetchRequest<NSFetchRequestResult>(entityName:"Article")
    do {
    let fetchedEmployees = try moc?.fetch(employeesFetch) as! [Article]
    print(fetchedEmployees.count)
    } catch {
    fatalError("Failed to fetch employees: \(error)")
    }

Output : 376

But when I am trying to fetch with NSFetchedResultsController. The fetchedObjects always returning nil. I used below code.

 fileprivate lazy var fetchedResultsController: NSFetchedResultsController<Article> = {
        // Create Fetch Request
        let moc = CoreDataHelper().backgroundContext
       // let fetchRequest: NSFetchRequest<Article> = Article.fetchRequest()
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName:"Article")
        // Configure Fetch Request
        fetchRequest.sortDescriptors = [NSSortDescriptor(key:"category", ascending: true)]
        // Create Fetched Results Controller
        let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext:moc!, sectionNameKeyPath: nil, cacheName: nil)
        // Configure Fetched Results Controller
        fetchedResultsController.delegate = self
        let quotes = fetchedResultsController.fetchedObjects
        return fetchedResultsController as! NSFetchedResultsController<Article>
    }()

The quotes is always nil. I am not able to figure out what is the problem?

Upvotes: 2

Views: 697

Answers (1)

Rajat Chaudhary
Rajat Chaudhary

Reputation: 175

try calling performFetch() on fetchedResultsController outside the closure.

hope that will work.

Upvotes: 1

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