title: Filter in specific firebase structure
body: <p>I looking for method how to filtering my firebase. I know that is on stack overflow a lot of examples but my configuration is different - see below:</p>
  
  <p><a href="https://i.stack.imgur.com/pkaHs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pkaHs.png" alt="enter image description here"></a></p>
  
  <p>and my code to fetch data is:</p>
  
  <pre><code>let usersDatabaseRef = Database.database().reference().child("usersDatabase").child(userID).child("Customers")
      usersDatabaseRef.observeSingleEvent(of: .value, with: { (snapshot) in
          for child in snapshot.children {
              let childSnap = child as! DataSnapshot
              let userCustomerSnap = childSnap
  
              for customer in userCustomerSnap.children.allObjects as! [DataSnapshot] {
                  let customerSnap = customer
                  let dict = customerSnap.value as! [String: Any]
  
                  let employee = dict["Assigned employee"]
  </code></pre>
  
  <p>then I appending employee to my Model.
  Is possible to filter my cells in tableView by employee? (when I tap on button with name of employee tableView should showing only its services)</p>