title: How to order documents by timestamp automatically in firebase?
body: <p>I've created an app and I am using firebase as well but I want to order the documents by timestamp such that my documents will be ordered from recently added ones to older ones.</p>
  
  <p>I wonder if there is a solution rather than using orderBy method because my project is very big.</p>
  
  <p>please help me.</p>
  
  <p>Note: I am devolping the app using flutter &amp; dart.</p>