title: Append some attributes in couchdb's userCtx
body: <p>As i know that couchdb supports _session to get a userCtx.</p>
  
  <p>If i request it after login, then i would get like below.</p>
  
  <blockquote>
    <p>{"ok":true,"userCtx":{"name":"bob4","roles":["manager"]},"info":{"authentication_db":"_users","authentication_handlers":["oauth","cookie","default"],"authenticated":"cookie"}}</p>
  </blockquote>
  
  <p>Actually, this result is based on a _users's document. </p>
  
  <p>I expect that i can get more information from a _users's document by _session.</p>
  
  <p>Let me give you an example.</p>
  
  <p>If i generate a document , a user information , with some attribute that is "e-mail" in _users.</p>
  
  <p>And then, request _session after login.</p>
  
  <p>I hope to get a result that includes an e-mail attribute , like below.</p>
  
  <blockquote>
    <p>{"ok":true,"userCtx":{"name":"bob4","e-mail":"joeh@gmail.com","roles":["manager"]},"info":{"authentication_db":"_users","authentication_handlers":["oauth","cookie","default"],"authenticated":"cookie"}}</p>
  </blockquote>
  
  <p>Is it possible to append some attributes to _session's result in couchdb?</p>
  
  <p>Thank in advance.</p>