title: mongoose where query with "or"
body: <p>How would I do this in mongoose, I could not find anything with an "or"</p>
  
  <pre><code>userModel.where('email')
           .equals(req.body.email)
           .or('username').equals(req.body.username) //need the "or"
           .exec(function (err, docs) {
  
    ....
  
    });
  </code></pre>