nested_form

<div id="edit-user">
  <%= form_for @user  do |user_form| %>
 
      <% if @user.role == 'member' %>
        <%= render 'edit_member', :f => user_form %>
      <% elsif @user.role == 'agent' %>
        <%= render 'edit_agent', :f => user_form %>
      <% end %>

      <div class="btn-group">
        <%= user_form.submit "Go!", :class => "btn btn-default", :type => 'submit', :id => 'user_edit' %>
        <%= flash[:message] %>
      </div>
  <% end %>
</div>

<ul class="edit_member">
  <li class="">
      <label  id="other-lang-lbl">What languages do you speak?</label>
        <table>
          <tbody id="other-lang">
            <th>Language</th><th class="pad">Proficiency</th><th></th>
              <%= f.fields_for :language_profs, @langprof do |builder| %>
                  <%= render "language_prof_fields", :f => builder %>
              <% end %>
          </tbody>
        </table>
        <br>
      <%= link_to_add_fields "Add another", f, :language_profs %>
  </li>
</ul>