title: Nested rails forms with Simple Form?
body: <p>How can I achieve a nested rails form? Im having trouble getting this setup properly. Right now I have:</p>
  
  <pre><code>&lt;%= simple_form_for @user do |f| %&gt;
  
    &lt;%= f.input :city %&gt;
    &lt;%= f.input :address %&gt;
    &lt;%= f.input :zipcode %&gt;
    &lt;%= f.association :interests, :as =&gt; :check_boxes, :label =&gt; false %&gt;
    &lt;%= f.association :holidays, :as =&gt; :check_boxes, :label =&gt; false %&gt;
  
    &lt;%= f.simple_fields_for :friend_birthdays do |friend_birthday| %&gt;
      &lt;%= f.input :name %&gt;
      &lt;%= f.input :gender, :collection =&gt; ['male','female'] %&gt;
    &lt;% end %&gt;
    &lt;%= f.button :submit %&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p><code>f.association</code> is working fine for my interests &amp; holidays models as they only need to collect a single attribute each. However, the <code>friend_birthdays</code> model has the same exact relationship as (interests &amp; holidays) with the user model but <strong><em>requires multiple attributes to be edited/added.</em></strong> Any ideas?</p>