@objc func addPlaceAction(sender: UIButton) {
      let alert = UIAlertController(title: "Add Place", message: nil,  preferredStyle: .alert)
      alert.addTextField { field in
         field.placeholder = "Input name of place here (example : JSEC)"
      }
      alert.addAction(UIAlertAction(title:"Save", style: .default,
                                    handler: {_ in
                                       let name = alert.textFields?.first?.text ?? ""
                                       guard !Place.checkNameExists(name: name) else {
                                          let errorAlert = UIAlertController(title: "Error", message: "\(name) already exists in database", preferredStyle: .alert)
                                          errorAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
                                          self.present(errorAlert, animated: true, completion: nil)
                                          return
                                       }
                                       let realm = try? Realm()
                                       let place = Place()
                                       place.name = name
                                       try? realm?.write {
                                          realm?.add(place)
                                       }
                                       print(self.places)
      }))
      alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { _ in
         alert.dismiss(animated: true, completion: nil)
      }))