Trying to erase duplicated values in array retrieved from firebase in swift - ios

Question

I am trying to retrieve the value called memberJobfrom a firebase dict. After I retrieved it, the goal is to erase the duplicates, showing the unique values in a TableView.
The problem is that jobsis empty but memberJobactually has the values while looping over.
Maybe someone can help me! :)
import UIKit
import FirebaseDatabase
import Foundation
import FirebaseFirestoreSwift
import CodableFirebase
class ProjectCharacterViewController: UIViewController {
// MARK: - Properties
#IBOutlet weak var specTxt: UITextField!
#IBOutlet weak var difficultyTxt: UITextField!
#IBOutlet weak var budgetTxt: UITextField!
#IBOutlet weak var tableView: UITableView!
var member = [TeamMember]()
var jobs: [String] = []
var uniqueJobs = [MemberJobsStruct]()
var soloJobs: [String] = []
var singleJobs: [String] = []
var test = ["Hallo", "Birne", "Apfel"]
override func viewDidLoad() {
super.viewDidLoad()
getJobs(for: User.current) { (memberJob) in
self.uniqueJobs = memberJob
}
soloJobs = removeDuplicates(array: jobs)
print("SoloJobs :", soloJobs)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
// MARK: - Functions
func gettheJob() {
soloJobs = removeDuplicates(array: jobs)
print("These are the unique Jobs: ", soloJobs)
}
func getJobs(for user: User, completion: #escaping ([MemberJobsStruct]) -> Void) {
let ref = Database.database().reference().child("team").child(user.uid)
ref.observe(DataEventType.value, with: { snapshot in
for case let child as DataSnapshot in snapshot.children {
guard let value = child.value as? [String: Any] else {
return completion ([])
}
let memberJob = value["memberJob"] as! String
self.jobs.append(memberJob)
}
})
}
func removeDuplicates(array: [String]) -> [String] {
var encountered = Set<String>()
var result: [String] = []
for value in array {
if encountered.contains(value) {
// Do not add a duplicate element.
}
else {
// Add value to the set.
encountered.insert(value)
// ... Append the value.
result.append(value)
}
}
return result
}
}
// MARK: - UITableViewDataSource
extension ProjectCharacterViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return soloJobs.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// let job = jobs[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "ProjectCharacterTableViewCell") as! ProjectCharacterTableViewCell
cell.jobLabel.text = soloJobs[indexPath.row]
return cell
}
}
// MARK: - UITableViewDelegate
extension ProjectCharacterViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
}
Update: I tried to simply make a new array soloJobsout of jobsbut even this is not working. what is the right approach to do something like this? right now I tried it several ways including this one but nothings working...
func getJobs(for user: User, completion: #escaping ([MemberJobsStruct]) -> Void) {
var jobs: [String] = []
let ref = Database.database().reference().child("team").child(user.uid)
ref.observe(DataEventType.value, with: { snapshot in
for case let child as DataSnapshot in snapshot.children {
guard let value = child.value as? [String: Any] else {
return completion ([])
}
let memberJob = value["memberJob"] as! String
jobs.append(memberJob)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
})
soloJobs = jobs
}

Answer 1

You're probably just missing the part where you should reload the UITableView after the getJobs method has appended the jobs.
func getJobs(for user: User, completion: #escaping ([MemberJobsStruct]) -> Void) {
//...
ref.observe(DataEventType.value, with: { snapshot in
for case let child as DataSnapshot in snapshot.children {
//...
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
}
Update: For getting the Unique objects from an array using the extension method from here.