Field with errors

validations.rb

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  unless html_tag =~ /^<label/
     %{<div class="field-with-errors">#{html_tag}<label for="#{instance.send(:tag_id)}" class="message">#{instance.error_message.first}</label> </div>}.html_safe
  else
    %{<div class="field-with-errors">#{html_tag}</div>}.html_safe
  end
end