How to search through firebase data in tableview

Code Block 
struct Post {
		var name: String?		// are they really optional ?
		var contactEmail: String?
		var contactPhoneNum: String?
		var age: String?
		var genderString?
		var lastSeen: String?
		var profileDescription: String?
}
var posts : [Post] = []	// Populated from Database
var filteredPosts : [Post] = []

Code Block 
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
	filteredPosts = []
	for post in posts {
		if let name = post.name?.lowercased(), name.contains(searchText.lowercased()){
			filteredPosts.append(post)
		}
	}
}

Code Block 
import UIKit
import Firebase
import FirebaseDatabase
import SwiftKeychainWrapper
import FirebaseAuth
class FeedVC: UITableViewController, UISearchBarDelegate{
   
  @IBOutlet weak var searchBar: UISearchBar!
   
  var currentUserImageUrl: String!
  var posts = [postStruct]()
  var selectedPost: Post!
  var currentPostsArray = [postStruct]()
   
  override func viewDidLoad() {
    super.viewDidLoad()
    getUsersData()
    getPosts()
    searchBar.delegate = self
    // Do any additional setup after loading the view.
  //   tableView.register(PostCell.self, forCellReuseIdentifier: "PostCell")
  }
  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
   
   
  func getUsersData(){
    guard let userID = Auth.auth().currentUser?.uid else { return }
    Database.database().reference().child("users").child(userID).observeSingleEvent(of: .value) { (snapshot) in
      if let postDict = snapshot.value as? [String : AnyObject] {
        self.tableView.reloadData()
      }
    }
  }
   
  struct postStruct {
    let name : String!
    let contactEmail : String!
    let contactPhoneNum : String!
    let age : String!
    let gender : String!
    let lastSeen : String!
    let profileDescription : String!
  }
   
  func getPosts() {
    let databaseRef = Database.database().reference()
    databaseRef.child("firstName").queryOrderedByKey().observe( .childAdded, with: {
          snapshot in
          let name = (snapshot.value as? NSDictionary)!["name"] as? String
          let contactEmail = (snapshot.value as? NSDictionary
          )!["contactEmail"] as? String
          let contactPhoneNum = (snapshot.value as? NSDictionary
          )!["contactPhoneNum"] as? String
          let age = (snapshot.value as? NSDictionary
          )!["age"] as? String
          let gender = (snapshot.value as? NSDictionary
          )!["gender"] as? String
          let lastSeen = (snapshot.value as? NSDictionary
          )!["lastSeen"] as? String
          let profileDescription = (snapshot.value as? NSDictionary
          )!["profileDescription"] as? String
      self.posts.append(postStruct(name: name,contactEmail:contactEmail, contactPhoneNum:contactPhoneNum, age:age, gender:gender, lastSeen:lastSeen, profileDescription:profileDescription))
      DispatchQueue.main.async {
            self.tableView.reloadData()
          }
        })
  }
   
  override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
  }
   
  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    print("posts count = ", posts.count)
    return posts.count
  }
   
  override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
   // tableView.dequeueReusableCell(withIdentifier: "PostCell")!.frame.size.height
    return 230
  }
  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
  cell.nameLabel?.text = posts[indexPath.row].name
    cell.contactEmailLabel?.text = posts[indexPath.row].contactEmail
    cell.contactPhoneNumLabel?.text = posts[indexPath.row].contactPhoneNum
    cell.ageLabel?.text = posts[indexPath.row].age
    cell.genderLabel?.text = posts[indexPath.row].gender
    cell.lastSeenLabel?.text = posts[indexPath.row].lastSeen
    cell.profileDescriptionLabel?.text = posts[indexPath.row].profileDescription
    print(posts)
    return cell
  }
   
  func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    // filteredPosts = []
    //if searchText == ""{
     // for post in posts {
      //      filteredPosts.append(post.name)
       //     }
      //}
    // else{
    //for post in posts {
     // if post.name?.lowercased().contains(searchText.lowercased()) == true {
      //  filteredPosts.append(post.name)
      //}
    //}
    //self.tableView.reloadData()
       
  }
  // }
}

Code Block 
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
	filteredPosts = []
	for post in posts {
		let name = post.name.lowercased()
		if name.contains(searchText.lowercased()) {
			filteredPosts.append(post)
		}
	}
}

Code Block 
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
  cell.nameLabel?.text = filteredPosts[indexPath.row].name
    cell.contactEmailLabel?.text = filteredPosts[indexPath.row].contactEmail
    cell.contactPhoneNumLabel?.text = filteredPosts[indexPath.row].contactPhoneNum
    cell.ageLabel?.text = filteredPosts[indexPath.row].age
    cell.genderLabel?.text = filteredPosts[indexPath.row].gender
    cell.lastSeenLabel?.text = filteredPosts[indexPath.row].lastSeen
    cell.profileDescriptionLabel?.text = filteredPosts[indexPath.row].profileDescription
    print(filteredPosts)
    return cell
  }
   
  func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    for post in posts {
      let name = post.name.lowercased()
      if name.contains(searchText.lowercased()) {
        filteredPosts.append(post)
      }
    }
  }
  }