title: simple_form sending parameter
body: <p>I'm trying to send an extra parameter submiting a form in rails using simple_form
  I thought this would do the trick:</p>
  
  <p><code>&lt;%= simple_form_for(@user, :groupId =&gt; 1) do |f| %&gt;</code></p>
  
  <p>but in tne controller, the parameter is ignored</p>
  
  <p>I found an answer in <a href="https://stackoverflow.com/questions/9828416/simple-form-send-a-extra-parameter">here</a> but I really like to have a better solution. </p>