title: How to view email/username in devise session controller
body: <p>I am attempting to create dual authentication using firebase and devise for ruby on rails. I already have the devise session controller extended and I am accessing firebase. It is based on whitelisted locations. (Probably not very secure but its mostly for a fun proof of concept project.) I want to get the username/email from the devise login page so i can find that user in the firebase database to look for the params associated with that name. I have already tried to look through documentation but i might have missed something.
  If anyone could tell me how to grab the username in the deviseSessions_controller. I would be grateful. </p>
  
  <p>Thank you ahead of time.</p>