title: Rails: how to save form data after posting
body: <p>When I use <code>form_for :model</code> the data is saved when I submit the form.</p>
  
  <p>However when I use <code>form_tag</code>, the data is lost after the form is processed.</p>
  
  <p>I need to use <code>form_tag</code> because I have two models in one form.</p>
  
  <p>Is there a way to save form data with <code>form_tag</code>?</p>