title: how does rails ActiveModel::Serializers compare to grape?
body: <p>Can someone explain the difference between <code>ActiveModel::Serializers</code> and <code>Grape</code>. Should I use one or the other or could/should they be used together. Could someone also explain the benefits of using one (or both) of the above versus just using <code>rails</code> by itself for building a <code>restful JSON API</code>?</p>
  
  <p>Thank you in advance</p>