searchbarによるtableview検索

searchbarを使用して使用してtableviewに表示されているCellの検索を行いたいです。
firebaseの情報をtableviewに反映させたのですが、この検索を行おうとしてもうまくできません。Cellにはfirebaseの中に入っている情報を表示しています。searchbarより、何らかの単語を検索した際にヒットするものを表示できるようにしたいと考えています。

Swift
1import UIKit
2import Firebase
3
4class roomlist:UIViewController{
5                      
6    private let cellId = "cellId"
7    private var rooms = [Room]()
8    var gotroom = [Room]()
9    private var selectedRoom : Room?
10    
11    
12    @IBOutlet weak var roomlisttable: UITableView!
13    @IBOutlet weak var roomsearch: UISearchBar!
14    
15    var searchroom = [String]()
16    
17    
18    override func viewDidLoad() {
19        super.viewDidLoad()
20
21        roomlisttable.delegate = self
22        roomlisttable.dataSource = self
23        fechroominfofirestore()
24
25    }
26
27    struct PasswordData {
28        var documentID: String
29
30    }
31    private func fechroominfofirestore(){
32
33        Firestore.firestore().collection("rooms").getDocuments{(snapshots,error) in
34            if error != nil{
35                print("sippai")
36
37                return
38
39            }
40           
41                self.rooms = []
42                snapshots?.documents.forEach { snapshot in
43                    let id = snapshot.documentID
44                    let dic = snapshot.data()
45                    let room = Room(dic: dic)
46                    
47                    self.rooms.append(room)
48                }
49                self.roomlisttable.reloadData()
50
51                self.rooms.forEach{(rooms) in
52
53                }
54            }
55
56        }
57    }
58
59extension roomlist:UITableViewDelegate, UITableViewDataSource{
60    
61    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
62    }
63    //  検索バーに入力があったら呼ばれる
64    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
65        guard !searchText.isEmpty else {
66            gotroom = rooms
67            roomlisttable.reloadData()
68            return
69        }
70        gotroom = rooms.filter({ item -> Bool in
71            item.bsubname.lowercased().contains(searchText.lowercased())
72        })
73        roomlisttable.reloadData()
74    }
75    
76    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
77        return rooms.count
78    }
79
80    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
81        let cell = roomlisttable.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! roomlistcell
82        cell.room = rooms[indexPath.row]
83
84        return cell
85    }
86
87    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
88
89        print("didSelectRowAt")
90        tableView.deselectRow(at: indexPath, animated: false)
91
92        Firestore.firestore().collection("rooms").getDocuments() { (querySnapshot, err) in
93            if err != nil {
94            } else {
95                for doc in querySnapshot!.documents {
96                    let documentID = doc.documentID
97
98                    
99                    print(documentID)
100                }
101                }
102            }
103        }
104    func tableView(_ tableView: UITableView, didHighlightRowAt indexPath: IndexPath) {
105
106    }
107
108    override func prepare(for segue : UIStoryboardSegue, sender: Any?){
109
110      print("Will move to next view controller.")
111      switch segue.identifier {
112      case "RoomdetqailsViewController":
113        if let RoomdetqailsViewController = segue.destination as? RoomdetqailsViewController {
114          if let indexPath = self.roomlisttable.indexPathForSelectedRow {
115            let room = self.rooms[indexPath.row]
116            RoomdetqailsViewController.received = room
117          }
118        }
119      default:
120        break
121      }
122    }
123}
124
125class roomlistcell : UITableViewCell{
126
127        var room: Room?{
128            didSet{
129                roomname.text = room?.bsubname
130                tname.text = "(" + room!.ctln + room!.dtfn + ")"
131            }
132        }
133
134    @IBOutlet weak var tname: UILabel!
135    @IBOutlet weak var roomimage: UIImageView!
136    @IBOutlet weak var roomname: UILabel!
137        override func awakeFromNib() {
138            super.awakeFromNib()
139            roomimage.layer.borderWidth = 0.5
140            roomimage.layer.borderColor = UIColor.bnw.cgColor
141            roomimage.layer.cornerRadius = roomimage.frame.width/2
142        }
143        override func setSelected(_ selected: Bool, animated: Bool) {
144            super.setSelected(selected, animated: animated)
145        }
146    }
147