Tukukkk

I am trying to get information from Subcategories, I have managed to retrieve subcategories in category using this code.

But, having some Trouble calling the data that is in a subcategories.

// Let's download the recipe list and its detail

        self.ref.child("Categories").observe(.childAdded) { (snapshot) in

        self.subcategories.removeAll()



        let enumerator = snapshot.children

        while let rest = enumerator.nextObject() as? DataSnapshot {

            self.subcategories.append(rest.key)

        }



        self.subcollectionView.reloadData()



    }



}

I have posted this before but had an issue with the account.

This is the code That I tried to use to reach the information in subcategories.

An example of the firebase data :

the error:

Would greatly appreciate an example of what I should do, As I am new to swift coding

@IBOutlet weak var card_cv: UICollectionView!



reference for the database

var refCategories: DatabaseReference!



var subcategories = [String]()



//  declare a string to receive the category name

var subCategoryName:String!





override func viewDidLoad() {

    super.viewDidLoad()



    //  declare the reference to database

    refCategories = Database.database().reference()





    //  setting the subcategory name as view controller's table

    self.title = subCategoryName



    //  let's set delegate for the tableview

    self.card_cv.dataSource = self

    self.card_cv.delegate = self



    // function to download  list from database

    self.downloadSubCategoriesFromDatabase()



}

Custom function download

func downloadSubCategoriesFromDatabase(){





    self.subcategories.removeAll()



    // download the snapshot

    self.refCategories.child("Categories").child(subCategoryName).observeSingleEvent(of: .value) { (snapshot) in



        self.subcategories.removeAll()



        let enumerator = snapshot.children

        while let rest = enumerator.nextObject() as? DataSnapshot {

            self.subcategories.append(rest.key)

        }



        self.card_cv.reloadData()



    }



}