title: Equivalent of .push in Firestore?
body: <p>I am trying to convert my firebase implementation which previously used realtime database to use firestore as I like the idea of collections and the perks of using it.</p>
  
  <p>How do I implement below into firestore equivalent?</p>
  
  <pre><code>firebase.database().ref('documentPath').push()
  </code></pre>