retrieve chat message in firebase issue in ios swift - ios

Question

I am using firebase for chat app.when I try to send a message. than message, table got value but not update chat-message table. I refer to this link Here [https://github.com/DevSurya/ChatApp-Swift-And-Firebase].
when I run demo its working fine. Observe method is not calling in my case and collectionview is not refreshing
This is how I write data :
private func sendMessageWithProperty(_ property: [String: AnyObject]){
let ref = Database.database().reference().child("messages")
let childRef = ref.childByAutoId()
let toId = user!.id!
let fromId = Auth.auth().currentUser!.uid
let timeStamp = NSNumber.init(value: Date().timeIntervalSince1970)
var values: [String : AnyObject] = ["toId":toId as AnyObject, "fromId":fromId as AnyObject, "timeStamp":timeStamp]
values = values.merged(with: property)
childRef.updateChildValues(values)
childRef.updateChildValues(values) { (error, ref) in
if error != nil {
print(error!)
return
}
self.inputTextField.text = nil
let userMessageRef = Database.database().reference().child("user-messages").child(fromId).child(toId)
let messageId = childRef.key
userMessageRef.updateChildValues([messageId: 1])
let recipentUserMessageRef = Database.database().reference().child("user-messages").child(toId).child(fromId)
recipentUserMessageRef.updateChildValues([messageId: 1])
}
}
This is how I read data
func observeMessage() {
guard let uid = Auth.auth().currentUser?.uid, let toId = user?.id else {
return
}
let userMessageRef = Database.database().reference().child("user-messages").child(uid).child(toId)
userMessageRef.observe(.childAdded, with: { (snapshot) in
let messageId = snapshot.key
let messagesRef = Database.database().reference().child("messages").child(messageId)
messagesRef.observeSingleEvent(of: .value, with: { (snapshot) in
guard let dict = snapshot.value as? [String: AnyObject] else {
return
}
let message = Message()
message.setValuesForKeys(dict)
self.messages.append(message)
DispatchQueue.main.async {
self.collectionView?.reloadData()
let indexpath = NSIndexPath.init(item: self.messages.count-1, section: 0)
self.collectionView?.scrollToItem(at: indexpath as IndexPath, at: .bottom, animated: true)
}
}, withCancel: nil)
}, withCancel: nil)
}
The ObserveMessage() function get automatically called when there is an update in database.but in my case its not get called. I think the problem is with user-messages table: it is not created when I send message.