How to search in Firebase Database Swift - swift

Question

am trying to use UISearchbar with my firebase database but i don't know if my code is rghit or not becuase it's crash everytime i run it and this's my code
var hotelList = [hotelsModel]()
var hotelsArray : [NSDictionary] = []
var filterHotels : [NSDictionary] = []
var databaseRef = Database.database().reference()
databaseRef.child("Hotels").queryOrdered(byChild: "name").observe(.childAdded, with: { (snapshot) in
self.hotelsArray.append(snapshot.value as! NSDictionary)
self.tableView.insertRows(at: [IndexPath(row: self.hotelsArray.count-1, section: 0)], with: UITableView.RowAnimation.automatic)
List item
}) { (error) in
print(error.localizedDescription)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//creating a cell using the custom class
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! hotelsTableViewCell
let hotelSearch : NSDictionary?
//the artist object
var hotel: hotelsModel
//getting the artist of selected position
//hotel = hotelList[indexPath.row]
if searchController.isActive && searchController.searchBar.text != "" {
hotelSearch = filterHotels[indexPath.row] as! NSDictionary
} else {
//getting the artist of selected position
hotel = hotelList[indexPath.row]
}
//getting the artist of selected position
hotel = hotelList[indexPath.row]
//adding values to labels
cell.lblName.text = hotel.name
cell.lblLocation.text = hotel.location
cell.appSuggest.text = hotel.appSuggest
cell.price.text = hotel.price
cell.canceletion.text = hotel.cancelation
cell.paymentNeeded.text = hotel.paymentNeeded
if let imgUrl = hotel.img{
let url = URL(string: imgUrl)
cell.img.kf.setImage(with: url)
cell.img.clipsToBounds = true
cell.img.layer.cornerRadius = 10
cell.img.layer.shadowColor = UIColor.black.cgColor
cell.img.layer.shadowOpacity = 1.8
cell.img.layer.shadowOffset = CGSize(width: 5, height: 0)
}
return cell
}
func updateSearchResults(for searchController: UISearchController) {
//update the searchbar result
//filterHotels(serachText:searchController.searchBar.text!)
filterHotels.removeAll()
filterHotels = hotelsArray.filter({ (text) -> Bool in
let tmp: NSString = (text as? NSString ?? nil) ?? ""
let range = tmp.range(of: searchController.searchBar.text!, options: NSString.CompareOptions.caseInsensitive)
return range.location != NSNotFound
})
self.tableView.reloadData()
}
it's crashed in this line
self.hotelsArray.append(snapshot.value as! NSDictionary)
How can I solve this?
Thank You