Rails 3 #error_messages_for, via @j3 => @RyanBates

error_messages_for.rb

def error_messages_for(*objects)
  options = objects.extract_options!
  options[:header_message] ||= I18n.t(:"activerecord.errors.header", :default => "Invalid Fields")
  options[:message] ||= I18n.t(:"activerecord.errors.message", :default => "Correct the following errors and try again.")
  messages = objects.compact.map { |o| o.errors.full_messages }.flatten
  unless messages.empty?
    content_tag(:div, :class => "error_messages") do
      list_items = messages.map { |msg| content_tag(:li, msg) }
      content_tag(:h2, options[:header_message]) + content_tag(:p, options[:message]) + content_tag(:ul, list_items.join.html_safe)
    end
  end
end

where error_messages_for.rb does reside in a project?