Enum not observed in SwiftUI - swift

Question

I have an enum that represent my response status like this:
enum BaseModelStatus: Equatable {
case success
case fail
}
then according to my response, i will set a value to my enum like this:
#Published var baseModelStatus : BaseModelStatus? = nil
func createRoom(roomName: String, roomPassword: String) {
// add document in a collection
if !roomName.isEmpty && !roomPassword.isEmpty {
db.collection("\(roomName)").document("roomData").getDocument(source: .cache) { (document, error) in
if let document = document {
self.checkRoomName = document.get("roomName") as! String
self.baseModelStatus = BaseModelStatus.fail
} else {
print("Document does not exist in cache")
self.db.collection("\(roomName)").document("roomData").setData([
"roomName": roomName,
"roomPassword": roomPassword
]) { err in
if let err = err {
print("Error writing document: \(err)")
self.baseModelStatus = .fail
} else {
print("Document successfully written!")
self.baseModelStatus = .success
}
}
}
}
}
}
but in UI, state is not updated. According to my enum status, i will show alert but in the first try it's not showing because enum is not observed :
#ObservedObject var model = RoomViewModel()
#State private var showingAlert = false
Button(action: {
if !roomName.isEmpty && !roomPassword.isEmpty {
print("create room tapped")
model.createRoom(roomName: roomName, roomPassword: roomPassword)
if model.baseModelStatus == BaseModelStatus.success {
print("success------------------------------------------------")
}
else if model.baseModelStatus == BaseModelStatus.fail {
print("fail!!!!!!!!!!!!!!!!!!!!!!")
showingAlert = true
}
roomName = ""
roomPassword = ""
}
}
) {
Text("Create Room")
)
}
.alert("The room is already exist!", isPresented: $showingAlert) {
Button("OK", role: .cancel) { }
}