app/views/partido_steps/old/_regiones_form.html.erb
<%= simple_form_for@partido, url: wizard_path, method: :put do |f| %>
<%= f.error_notification %>
<div class="form-inputs boxed_form">
<%= f.association :regions, as: :check_boxes, collection: Region.all.sort, :selected => @partido.regions, :label => "Regiones" %>
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>