NSUnknownKeyException on a model variable - firebase

Question

'[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key text.'
I'm getting an NSUnknownKeyException at the text variable of my Message model when I attempt to access it in my second tableView() function (at the end of this code). I am still pretty new to swift and don't know how to resolve this. Through my google searches, I found that it could be something to do with storyboards, but I've actually opted to create my UI programmatically so I'm not sure how that could be causing this.
import UIKit
import Firebase
class ViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "chat", style: .plain, target: self, action: #selector(handleChat))
observeMessages()
}
#objc func handleChat() {
let chatController = ChatController(collectionViewLayout: UICollectionViewLayout())
navigationController?.pushViewController(chatController, animated: true)
//present(chatController, animated: true, completion: nil)
}
var messages = [Message]()
func observeMessages() {
let ref = Database.database().reference().child("FalconsVPackers").child("messages")
ref.observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let message = Message()
message.setValuesForKeys(dictionary)
self.messages.append(message)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}, withCancel: nil)
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messages.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .subtitle, reuseIdentifier: "called")
let message = messages[indexPath.row]
cell.textLabel?.text = message.text
return cell
}
}
My Message model is very simple...
import UIKit
class Message: NSObject {
var text: String?
}
Any help or advice would be greatly appreciated!

Answer 1

You are using NSKeyValueCoding to populate Message object so you must add #objc to text property.
message.setValuesForKeys(dictionary) // NSKeyValueCoding
.
class Message : NSObject {
#objc var text: String?
}
If you just want to populate your message object, better just use properties directly instead of setValuesForKeys. And in this case you don't have to use #objc too.
let message = Message()
message.text = dictionary["text"]