jumpstart/app/helpers/application_helper.rb

module ApplicationHelper
  def bootstrap_class_for(flash_type)
    {
      success: "alert-success",
      error: "alert-danger",
      alert: "alert-warning",
      notice: "alert-info"
    }.stringify_keys[flash_type.to_s] || flash_type.to_s
  end

  def flash_messages(opts={})
    flash.each do |msg_type, message|
      concat(content_tag(:div, message, class: "alert #{bootstrap_class_for(msg_type)}") do
        concat content_tag(:button, content_tag(:span, "×"), class: "close", data: { dismiss: 'alert' })
        concat message
      end)
    end
    nil
  end
end