app/views/countries/_form.html.erb
<%= form_for(@country) do |f| %>
<% if @country.errors.any? %>
<div id="errorExplanation">
<h2><%= pluralize(@country.errors.count, "error") %> prohibited this country from being saved:</h2>
<ul>
<% @country.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :display_name %><br />
<%= f.text_area :display_name %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>