Table view not updating with Firebase

Question

I am trying to get a table view to update from my Firebase database. My data is structured like this (for reporting automobiles):

Reports:
- Randomly generated report ID number:
- - make: "make of car"
- - model: "make of model"

I don't think that I am calling the data correctly. I do not know how to select for the random report ID. But there may be something else that I am missing. I am trying to get only the make and model of the vehicle to display in the text of the cell

var reportList:[String] = [] var ref: DatabaseReference! var handle: DatabaseHandle? @IBOutlet weak var reportsTableView: UITableView! @IBAction func backButtonPressed(_ sender: UIBarButtonItem) { self.performSegue(withIdentifier: "reportsToHome", sender: self) } public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return reportList.count } public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{ let cell = UITableViewCell(style: .default, reuseIdentifier: "cell") cell.textLabel?.text = reportList[indexPath.row] return cell } override func viewDidLoad() { super.viewDidLoad() ref = Database.database().reference() handle = ref.child("Reports").observe(.childAdded, with: { (snapshot) in if (snapshot.value as? String) != nil { let make = String(describing: self.ref.child("Reports").child("make")) let model = String(describing: self.ref.child("Reports").child("model")) self.reportList.append(make + model) self.reportsTableView.reloadData() } } // Do any additional setup after loading the view. )} override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }

}

Are you trying to get multiple Reports, or will there only be the one Report? — Grady
– Grady, Commented Aug 1, 2017 at 14:36
There will be multiple reports. The database checks for any new reports coming in and posts them. Or at least it is supposed to. — Bob
– Bob, Commented Aug 1, 2017 at 15:04

Grady · Accepted Answer · 2017-08-01 15:11:33Z

I'm not able to test this, but I have feeling that you were trying to cast the snapshot as a string. Instead, you should cast it as a Dictionary so you can easily retrieve the data by key.

Try this code. It sets the snapshot as a dictionary, and from there you are able to retrieve the make and model:

override func viewDidLoad() { super.viewDidLoad() ref = Database.database().reference() handle = ref.child("Reports").observe(.childAdded, with: { (snapshot) in if let reports = snapshot.value as? NSDictionary { var make = reports?["make"] as? String var model = reports?["model"] as? String self.reportList.append(make + model) self.reportsTableView.reloadData() } } )}

Going further, you can create a Report class:

class Report: NSObject { var make: String? var model: String? }

You can then set the make and model from the snapshot to create a new Report object.

var make = reports?["make"] as? String var model = reports?["model"] as? String let newReport = Report() newReport.setValuesForKeys(reports)

I hope this works, if not I'll look again.

I tried it, but it did not work. I will play around with the Report class in the mean time. EDIT: never mind. It works, I had accidentally deleted too much when editing. Thank you very much for the help!

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