Add Bootstrap Alerts to Rails Application

I see a lot of example on how to do this. Most generate an alert for every error that returns to the page. With this solution it brings all messages by type together into one alert per type.

module BetterBootstrapFlashHelper

  ALERT_TYPES = [:error, :info, :success, :warning]

  def bootstrap_application_flash
    flash_messages = []
    alert_result_types = {:error => [], :info => [], :success => [], :warning => []}
    flash.each do |type, message|
      # Skip empty messages, e.g. for devise messages set to nothing in a locale file.
      next if message.blank?

      type = :success if type == :notice
      type = :error if type == :alert
      next unless ALERT_TYPES.include?(type)
      Array(message).each do |msg|
        alert_result_types[type] << content_tag(:li, msg.html_safe) if msg
      end
    end
    alert_result_types.each do |key, content|
      flash_messages << generate_alert(key, content_tag(:ul, content.join.html_safe, :class => 'unstyled')) if content.length > 0
    end
    flash_messages.join.html_safe
  end

  def generate_alert(type, messages)
    content_tag(:div,
                content_tag(:button, raw("&times;"), :class => "close", "data-dismiss" => "alert") +
                    messages, :class => "alert fade in alert-#{type}")
  end

end