title: What is the use case of reference type in Firestore Document and how to use it specially in an android app?
body: <p>In my Android app, if I get the document path by getting the value of reference type field of a document then how am I going to call it? Because the reference path I'm going to get would be something like <code>/Users/OctUsers/1stWeekUsers/OlCvJFfWZeAlcttdlgzz/</code> and method for retrieving a Firestore document is something like 
  <code>FirebaseFirestore.getInstance().collection(collectionPath).document(documentPath).collection(collectionPath).document(documentPath)</code> and so on. How am I going to iterate over reference path for getting every collectionPath and documentPath to be used in the Firestore DocumentReferece#get method?</p>
  
  <p>Has anyone actually used this reference field type in their Firestore database then please drop the screenshot for letting us know more use cases of this?</p>
  
  <p><a href="https://i.stack.imgur.com/aOQzl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aOQzl.png" alt="enter image description here"></a></p>