Firebase + Swift TableView Sorted by Dates - ios

Question

I am fairly new to realm of coding and I know this question might have been answered similarly elsewhere but when it comes to Firebase it may not. I was following this answer (Adding sections, separated by dates, to UITableView in Swift) but encounters complication when I implement .ChildAdded and insertRowAtIndexPath. My code as follows:
var ref: FIRDatabaseReference!
var mileageDatabase: [FIRDataSnapshot]! = []
var retrieveDates: [(String)] = []
var uniqueDates: [(String)] = []
struct tripDataset {
let date: String
let purpose: String
}
var tripItems = Dictionary<String, Array<tripDataset>>()
override func viewDidLoad() {
super.viewDidLoad()
self.tableView = UITableView(frame: self.tableView.frame, style: .Grouped)
let nib = UINib(nibName: "TripTableViewCell", bundle: nil)
self.tableView.registerNib(nib, forCellReuseIdentifier: "cell")
configureDatabase()
}
func configureDatabase() {
self.ref = FIRDatabase.database().reference()
if let user = FIRAuth.auth()?.currentUser {
self.ref.child("mileage").queryOrderedByChild("user").queryEqualToValue(user.uid).observeEventType(.ChildAdded, withBlock: { (snapshot) in
self.mileageDatabase.insert(snapshot, atIndex: 0)
let snapValues = snapshot.value as! Dictionary< String, AnyObject>
let snapDates = snapValues["date"] as! String
let snapPurpose = snapValues["purpose"] as! String
self.retrieveDates.append(snapValues["date"] as! String)
self.uniqueDates = Array(Set(self.retrieveDates))
if self.tripItems.indexForKey(snapDates) == nil {
self.tripItems[snapDates] = [tripDataset(date: snapDates, purpose: snapPurpose)]
} else {
self.tripItems[snapDates]!.append(tripDataset(date: snapDates, purpose: snapPurpose))
}
self.tableView.insertRowsAtIndexPaths([NSIndexPath(forRow: 0, inSection: 0)], withRowAnimation: .Automatic) //Stuck hereeee.....
})
}
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return self.uniqueDates.count
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.tripItems[section].count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TripTableViewCell
cell.dateTimeLabel.text = self.uniqueDates(indexPath.section)
cell.purposeLabel.text = self.tripItem[self.uniqueDates(indexPath.section)]["purpose"]
return cell
}
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return self.uniqueDates(section)
}
I know there are many errors here, is there anyone who can direct me accordingly? All the async nature of Firebase just complicates the flow for me.

Answer 1

try this .
Change below code from
self.retrieveDates.append(snapValues["date"] as! String)
to
self.retrieveDates.insert( snapValues, at : 0)