title: Is ArangoDB edge document right place to put additional key-value?
body: <p>In MySql we create simple users friendships database with two models users and friendships.</p>
  
  <p>Model friendships contain keys:</p>
  
  <ul>
  <li>id</li>
  <li>from (ref. key)</li>
  <li>to (ref. key)</li>
  <li>created</li>
  <li>modified</li>
  <li>approved (0,1)</li>
  <li>block (0,1)</li>
  </ul>
  
  <p>What is the correct way to make the same in ArangoDB,
  Can there be a "friendships" edge document with added key - values?
  Is it possible to perform update edge document?
  Also, is it possible these values show after performing the request as a result?</p>