rails undefined method error_messages
学习了：http://stackoverflow.com/questions/10002140/use-error-messages-in-rails-3-2-raises-undefined-method-error
<%= form_for [@camp, @program] do |f| %>
<% @program.errors.full_messages.each do |msg| %>
<p><%= msg %></p>
<% end %>
<%= f.label :name %>
<% end %>
rails undefined method error_messages
原文：http://www.cnblogs.com/stono/p/6759652.html