title: How do I retrieve user based on session token in the Parse REST API?
body: <p>Using the Parse REST API, once I have authenticated a user with username and password, I get a session token. I store that session token in the user's cookie's, but how do I fetch a user with that session token?</p>
  
  <p>My web app is in Ruby on Rails. I'm using gem parse-ruby-client.</p>
  
  <p><code>Parse::User.authenticate('cooldude6', PASSWORD)</code></p>
  
  <p>returns</p>
  
  <p><code>{"username"=&gt;"cooldude6",
   "createdAt"=&gt;"2013-01-31T15:22:40.339Z",
   "objectId"=&gt;"2bMfWZQ9Ob",
   "sessionToken"=&gt;"zrGuvs3psdndaqswhf0smupsodflkqbFdwRs"}</code></p>
  
  <p>How do I then use that sessionToken to retrieve the current user from Parse?</p>