<% form_for(:resource, :url => resources_path) do |f| %>
  <%= f.text_field :name %>
  <%= f.validation_for :name, :class => 'validator' %>

  <%= f.text_field :age
  <%= f.validation_for :age %>

  <%= submit_tag "Enviar!" %>
  <%= f.validation_summary 'El formulario contiene los siguientes errores:' %>
<% end %>