Swift Firebase TableView Data - DataEventType.value - ios

Question

I am doing a call into a child "following" and am seeing if the logged-in user's UID is there and has a child of another user which the logged-in user is following.
I am printing who the logged-in user is following into a tableview. The first problem is my code, because I know it is bad practice to have two firebase calls within each other so I need someone to teach me a better method. Because of the poor code, when I go unfollow the other user and come back to the tab where the logged-in users list of who they are following is displayed it shows this (image below). When the logged-in user is following nobody it should just display the "Sorry!" text, yet still keeps who the user was following. Need someone to teach me a better method for doing this type of firebase call. Code and a firebase JSON stack image are below... In the firebase JSON stack image, the expanded UID is the logged-in user and the child in is the other user the logged-in user is following. I need a better way to call and extract this information, I am just ignorant of how-to.
func getFollowingData() {
Database.database().reference().child("following").child(uid!).observe(DataEventType.value, with: { (snapshot) in
if snapshot.exists() {
print("Got Snapshot")
Database.database().reference().child("following").child(self.uid!).observe(.childAdded, with: { (snapshot) in
if snapshot.exists() {
print(snapshot)
let snapshot = snapshot.value as? NSDictionary
self.listFollowing.append(snapshot)
self.followingTableView.insertRows(at: [IndexPath(row:self.listFollowing.count-1,section:0)], with: UITableViewRowAnimation.automatic)
self.followingTableView.backgroundView = nil
}
})
} else {
print("No Snapshot")
self.followingTableView.backgroundView = self.noDataView
}
})
}

Answer 1

Figured it out, just needed to do it how I did it before on other feeds.
import UIKit
import Firebase
class BusinessFollowing: UITableViewController {
#IBOutlet var noDataView: UIView!
#IBOutlet var followingTableView: UITableView!
var yourFollowing = [Information]()
var listFollowing = [NSDictionary?]()
var databaseRef = Database.database().reference()
let uid = Auth.auth().currentUser?.uid
var loggedInUser = Auth.auth().currentUser
var loggedInUserData:NSDictionary?
var following = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.followingTableView.backgroundView = nil
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.followingTableView.reloadData()
self.yourFollowing.removeAll()
self.following.removeAll()
getFollowingData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if segue.identifier == "following" {
// gotta check if we're currently searching
if let indexPath = followingTableView.indexPathForSelectedRow {
let user = listFollowing[indexPath.row]
let controller = segue.destination as? ExploreBusinessProfileSwitchView
controller?.otherUser = user
}
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.yourFollowing.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! BusinessFollowingCell
let following = yourFollowing[indexPath.row]
let businessName = following.businessName
let businessStreet = following.businessStreet
let businessCity = following.businessCity
let businessState = following.businessState
cell.businessName.text = businessName
cell.businessStreet.text = businessStreet
cell.businessCity.text = businessCity
cell.businessState.text = businessState
// cell.businessName?.text = self.listFollowing[indexPath.row]?["businessName"] as? String
// cell.businessStreet?.text = self.listFollowing[indexPath.row]?["businessStreet"] as? String
// cell.businessCity?.text = self.listFollowing[indexPath.row]?["businessCity"] as? String
// cell.businessState?.text = self.listFollowing[indexPath.row]?["businessState"] as? String
return cell
}
func getFollowingData() {
self.yourFollowing.removeAll()
self.following.removeAll()
self.followingTableView.reloadData()
Database.database().reference().child("Businesses").child((loggedInUser?.uid)!).child("following").observe(.value, with: { snapshot in
if snapshot.exists() {
MBProgressHUD.showAdded(to: self.view, animated: true)
let databaseRef = Database.database().reference()
databaseRef.child("Businesses").queryOrderedByKey().observeSingleEvent(of: .value, with: { (usersSnapshot) in
let users = usersSnapshot.value as! [String: AnyObject]
for (_, value) in users {
if let userID = value["uid"] as? String {
if userID == Auth.auth().currentUser?.uid {
print(value)
if let followingUsers = value["following"] as? [String : String] {
for (_,user) in followingUsers {
self.following.append(user)
}
}
databaseRef.child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { (postsSnapshot) in
let posts = postsSnapshot.value as! [String: AnyObject]
for (_, post) in posts {
for (_, postInfo) in post as! [String: AnyObject] {
if let followingID = postInfo["uid"] as? String {
for each in self.following {
if each == followingID {
guard let uid = postInfo["uid"] as! String? else {return}
guard let name = postInfo["businessName"] as! String? else {return}
guard let address = postInfo["businessStreet"] as! String? else {return}
guard let state = postInfo["businessState"] as! String? else {return}
guard let city = postInfo["businessCity"] as! String? else {return}
self.yourFollowing.append(Information(uid: uid, businessName: name, businessStreet: address, businessCity: city, businessState: state))
}
self.followingTableView.backgroundView = nil
self.followingTableView.reloadData()
}
}
}
}
MBProgressHUD.hide(for: self.view, animated: true)
}) { (error) in
print(error.localizedDescription)
}
}
}
}
})
} else {
print("Not following anyone")
self.followingTableView.backgroundView = self.noDataView
MBProgressHUD.hide(for: self.view, animated: true)
}
})
}
}