Cannot set value of Textfield as Firebase search result - Swift - swift

Question

I have a search function in my app to search my firebase db based on a pub name entered. This is working correctly & returning the correct record in my console. However I'm trying to display the relating info to that search query as values on my textfields.
var drinkReference: DatabaseReference!
let databaseRef = Database.database().reference()
#IBOutlet weak var pintImage: UIImageView!
#IBOutlet weak var pubName: UITextField!
#IBOutlet weak var pubLocation: UITextField!
#IBOutlet weak var price: UITextField!
#IBOutlet weak var rating: UITextField!
#IBOutlet weak var comment: UITextField!
#IBOutlet weak var searchText: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(AddDrinkVC .dismissKeyboard))
view.addGestureRecognizer(tap)
drinkReference = Database.database().reference().child("Drinks");
NotificationCenter.default.addObserver(self, selector: #selector(SearchVC.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(SearchVC.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
#IBAction func searchIsClicked(_ sender: Any) {
searchT()
}
#IBAction func homeClicked(_ sender: Any) {
homeClicked()
}
func searchT() {
// You must cast pub variable as String.
guard let pub: String = searchText.text else { return }
let databaseRef = Database.database().reference().child("Drinks")
let query = databaseRef.queryOrdered(byChild: "pub").queryStarting(atValue: pub).queryEnding(atValue: "\(String(describing: pub))\\uf8ff")
query.observeSingleEvent(of: .value) { (snapshot) in
guard snapshot.exists() != false else {
let alert = UIAlertController(title: "", message: "This pub hasn't been visited yet. We'll get there.", preferredStyle: UIAlertControllerStyle.alert)
let search = UIAlertAction(title: "Want to add the drink yourself?", style: .default) { [weak self] _ in
self?.uploadClicked()
}
alert.addAction(search)
alert.addAction(UIAlertAction(title: "Close & Search again", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
return }
print(snapshot.value as Any)
DispatchQueue.main.async {
guard let dict = snapshot.value as? [String:Any] else {
print(snapshot)
return
}
let returnedPubName = dict["pub"] as? String
let returnedPubLocation = dict["location"] as? String
let returnedPintPrice = dict["price"] as? String
let returnedPintRating = dict["rating"] as? String
let returnedComment = dict["comment"] as? String
self.pubName.text?.append(returnedPubName!)
self.pubLocation.text?.append(returnedPubLocation!)
self.price.text?.append(returnedPintPrice!)
self.rating.text?.append(returnedPintRating!)
self.comment.text?.append(returnedComment!)
}
}
}
When I try to assign the value of 'pubName' to the textfield of the same name it's receiving nil. Is this due to my 'guard let dict....' code?
Does anyone know how & where I'm going wrong here?
Thanks, E

Answer 1

Create a struct like this:-
struct Names {
var pub: String = ""
var location: String = ""
var price: String = ""
var rating: String = ""
var comment: String = ""
init(data: [String:Any]) {
if let obj = data["pub"] as? String {
self.pub = obj
}
if let obj = data["location"] as? String {
self.location = obj
}
if let obj = data["price"] as? String {
self.price = obj
}
if let obj = data["rating"] as? String {
self.rating = obj
}
if let obj = data["comment"] as? String {
self.comment = obj
}
}
}
And in your controller class create a variable
var names: [Names] = [Names]()
Then in your searchT method do this
guard let dict = snapshot.value as? [String:Any] else {
return
}
self.names.append(Names(data: dict))
print(self.names)
And then use
self.pubName.text = names.first?.pub
And if it not works just try after
DispatchQueue.main.async {
guard let dict = snapshot.value as? [String:Any] else {
return
}
self.names.append(Names(data: dict))
print(self.names)
}
self.pubName.text = names.first?.pub

Answer 2

So through trial and error & with the help of a few folk this is the working code, as a note I'm not sure if this is the most efficient way or anything, but it works so c'est la vie.
func searchT() {
// You must cast pub variable as String.
guard let pub: String = searchText.text else { return }
let databaseRef = Database.database().reference().child("Drinks")
let query = databaseRef.queryOrdered(byChild: "pub").queryStarting(atValue: pub).queryEnding(atValue: "\(String(describing: pub))\\uf8ff")
query.observeSingleEvent(of: .value) { (snapshot) in
guard snapshot.exists() != false else {
let alert = UIAlertController(title: "", message: "This pub hasn't been visited yet. We'll get there.", preferredStyle: UIAlertControllerStyle.alert)
let search = UIAlertAction(title: "Want to add the drink yourself?", style: .default) { [weak self] _ in
self?.uploadClicked()
}
alert.addAction(search)
alert.addAction(UIAlertAction(title: "Close & Search again", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
return }
print(snapshot.value as Any)
DispatchQueue.main.async {
// DATA WAS FOUND
for user_child in (snapshot.children) {
let user_snap = user_child as! DataSnapshot
let dict = user_snap.value as! [String: String?]
// DEFINE VARIABLES FOR LABELS
let returnedPubName = dict["pub"] as? String
let returnedPubLocation = dict["location"] as? String
let returnedPintPrice = dict["price"] as? String
let returnedPintRating = dict["rating"] as? String
let returnedComment = dict["comment"] as? String
self.pubName.text?.append(returnedPubName!)
self.pubLocation.text?.append(returnedPubLocation!)
self.price.text?.append(returnedPintPrice!)
self.rating.text?.append(returnedPintRating!)
self.comment.text?.append(returnedComment!)
}
}
}
}
Pay particular attention to the code following the comment //DATA WAS FOUND, that's accessing the values of the children data records.