Why is my data not showing up in my TableView? - arrays

Question

The data that I am retrieving from Firebase is not showing up in my table view, but it is showing up in my snapshot. What am I missing?
Here is my code:
import UIKit
import Firebase
import FirebaseDatabase
class NewConversationViewController: UITableViewController {
var users = [User]()
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()
tableView.delegate = self
tableView.dataSource = self
fetchUser()
tableView.isHidden = false
}
func fetchUser() {
Database.database().reference().child("users").observeSingleEvent(of: .value, with: { snapshot in
if let dictionary = snapshot.value as? [String: AnyObject] {
let user = User()
user.setValuesForKeys(dictionary)
self.users.append(user)
}
print(snapshot)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}, withCancel: nil)
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return users.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let user = users[indexPath.section]
cell.textLabel?.text = user.name
return cell
}
}