app/views/shopping/coupons/show.html.erb
<h2> Coupon </h2>
<% unless @coupon.errors.empty? %>
<ul>
<% @coupon.errors.full_messages.each do |msg| %>
<li><strong><%= msg %></strong></li>
<% end %>
</ul>
<% end %>
<%= form_for(@coupon, :url => shopping_coupon_path(@coupon)) do |f| %>
<div class="field">
<%= f.label :code %>
<%= f.text_field :code %>
</div>
<div style='display:inline;'>
<%= submit_tag "Save", class: 'button small' %>
<%= link_to 'Skip Coupon', shopping_orders_path, class: ' button small' %>
</div>
<% end %>