Swift Firebase QueryLimitedToFirst - ios

Question

Hi I am trying to limit a feed to the most recent two posts from users. I was reading the Firebase documentation and it said simply to add "queryLimited(toFirst: Int)" and so far it has not been working, my feed still retrieves all the posts from each user. At the very top is where I have implemented the "queryLimited".
Edit
The way my code is right now, it is only limiting the users and not the posts(json tree below) so how can I change it to limit the posts of each user?
func getAllPosts(refreshing: Bool, refreshControl: UIRefreshControl?) {
let ref = Database.database().reference().child("posts").queryLimited(toFirst: 2)
MBProgressHUD.showAdded(to: self.view, animated: true)
ref.queryOrdered(byChild: "businessName").observe(.childAdded, with: { snapshot in
//observeSingleEvent(of: .value, with: { snapshot in
if let dict = snapshot.value as? NSDictionary {
self.feeds = []
for item in dict {
let json = JSON(item.value)
let uid = json["uid"].stringValue
var name: String = json["businessName"].stringValue
let address: String = json["businessStreet"].stringValue
let state: String = json["businessCity"].stringValue
let caption: String = json["caption"].stringValue
let downloadURL: String = json["download_url"].stringValue
let timestamp = json["timestamp"].doubleValue
let date = Date(timeIntervalSince1970: timestamp/1000)
let postID: String = json["postID"].stringValue
let lat = json["businessLatitude"].doubleValue
let long = json["businessLongitude"].doubleValue
let businessLocation = CLLocation(latitude: lat, longitude: long)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters: Double = userLocation.distance(from: businessLocation)
let distanceInMiles: Double = distanceInMeters * 0.00062137
let distanceLabelText = String(format: "%.2f miles away", distanceInMiles)
self.uid = json["uid"].stringValue
let usersReference = Database.database().reference(withPath: "users").queryOrderedByKey().queryEqual(toValue: uid)
usersReference.observeSingleEvent(of: .value, with: { snapshot in
if let dict = snapshot.value as? NSDictionary {
let userInfo = dict.allValues[0]
let userJSON = JSON(userInfo)
name = userJSON["name"].stringValue
}
let post = Post(uid: uid, caption: caption, downloadURL: downloadURL, name: name, date: date, address: address, state: state, distance: distanceLabelText, postID: postID)
self.feeds.append(post)
// sort posts by date/distance
self.feeds.sort {$0.date.compare($1.date) == .orderedDescending}
self.feeds.sort {$0.distance.compare($1.distance) == .orderedAscending}
self.feedTableView.reloadData()
})
}
}
if refreshing {
refreshControl?.endRefreshing()
}
MBProgressHUD.hide(for: self.view, animated: true)
})
}

Answer 1

I'm pretty sure that the order query must precede the limit query.
let ref = Database.database().reference().child("posts").queryOrdered(byChild: "businessName").queryLimited(toFirst: 2)