René

Adopted to reflect changes made in bootstrap3:

<% if object.errors.any? %>
  <div class="alert fade in alert-danger alert-dismissable"><button aria-hidden="true" class="close" data-dismiss="alert" type="button">×</button>
    <ul>
      <% object.errors.full_messages.each do |msg| %>
        <%= content_tag :li, msg, :id => "error_#{msg}" if msg.is_a?(String) %>
      <% end %>
    </ul>
  </div>
<% end %>