app/views/partido_steps/pactos_electorales.html.erb
<div class="container">
<h2 class="page-header">Pactos</h2>
<%= render :layout => 'form' do |f| %>
<div class="row">
<div class="col-md-4">
<div class="form-inline">
<div class="form-group">
<%= link_to_add_association f, :pacto_electorals, class: 'btn btn-success form-control', data: { 'association-insertion-method': 'append', 'association-insertion-node': '.nuevo-pacto' } do %>
<i class="fa fa-plus"></i> Agregar pacto
<% end %>
</div>
</div>
</div>
</div>
<div class="row nuevo-pacto"></div>
<div class="row">
<%= f.fields_for :pacto_electorals do |builder| %>
<%= render 'pacto_electoral_fields', :f => builder %>
<% end %>
</div>
<% end %>
</div>