app/views/partido_steps/old/_representantes_form.html.erb
<%= simple_form_for @partido, url: wizard_path, method: :put do |f| %>
<%= f.error_notification %>
<div class="form-inputs boxed_form">
<div class="form-group">
<%= f.fields_for :representantes do |builder| %>
<%= render 'representante_fields', :f => builder %>
<% end %>
<%= link_to_add_association 'add representante', f, :representantes %>
</div
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>