# File lib/action_view/helpers/active_record_helper.rb, line 99
      def error_messages_for(object_name, options = {})
        options = options.symbolize_keys
        object = instance_variable_get("@#{object_name}")
        unless object.errors.empty?
          content_tag("div",
            content_tag(
              options[:header_tag] || "h2",
              "#{pluralize(object.errors.count, "error")} prohibited this #{object_name.to_s.gsub("_", " ")} from being saved"
            ) +
            content_tag("p", "There were problems with the following fields:") +
            content_tag("ul", object.errors.full_messages.collect { |msg| content_tag("li", msg) }),
            "id" => options[:id] || "errorExplanation", "class" => options[:class] || "errorExplanation"
          )
        end
      end