title: Create multiple users in one form
body: <p>I have Event model and a show page which shows the <code>@event</code> page and the customer registration form. </p>
  
  <p>Now, my client wants a form for a different kind of event, which would have customer fields as well but labeled not customer name but parent / carer's name (similar form for a customer) and he also wants a <code>Add player</code> button on the bottom which would allow the parent /carer to add max 3 players. So the buisness need is that a parent registers 'players'. It should be possible to add max 3 players. I am wondering how I could go about creating 4 customers in one form. To me it sounds a bit odd, to be honest. Is this even possible? Or should I introduce <code>Parent</code> model and a <code>Player</code> model and connect them with each other. So for specific kinds of events I would create a Parent/Carer and max 3 players.</p>
  
  <pre><code>&lt;%= simple_form_for @customer do |f| %&gt;
   ...
  &lt;% end %&gt;
  </code></pre>