error_messages_for (ActionView::Helpers::ActiveRecordHelper)

    # File lib/action_view/helpers/active_record_helper.rb, line 170
          def error_messages_for(*params)
            options = params.extract_options!.symbolize_keys

            if object = options.delete(:object)
              objects = [object].flatten
            else
              objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
            end

            count  = objects.inject(0) {|sum, object| sum + object.errors.count }
            unless count.zero?
              html = {}
              [:id, :class].each do |key|
                if options.include?(key)
                  value = options[key]
                  html[key] = value unless value.blank?
                else
                  html[key] = 'errorExplanation'
                end
              end
              options[:object_name] ||= params.first

              I18n.with_options :locale => options[:locale], :scope => [:activerecord, :errors, :template] do |locale|
                header_message = if options.include?(:header_message)
                  options[:header_message]
                else
                  object_name = options[:object_name].to_s.gsub('_', ' ')
                  object_name = I18n.t(object_name, :default => object_name, :scope => [:activerecord, :models], :count => 1)
                  locale.t :header, :count => count, :model => object_name
                end
                message = options.include?(:message) ? options[:message] : locale.t(:body)
                error_messages = objects.sum {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } }.join

                contents = ''
                contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
                contents << content_tag(:p, message) unless message.blank?
                contents << content_tag(:ul, error_messages)

                content_tag(:div, contents, html)
              end
            else
              ''
            end
          end