A simple module to enqueue emails with Resque

mail_queue.rb

module MailQueue

  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def queue
      :mailers
    end

    # Add mail to queue Notifier.async_reply(Notification.first)
    def method_missing(m, *args, &block)
      object = args.first

      if m.to_s =~ /^async_([_a-zA-Z]*)$/ && self.respond_to?($1)
        send_later($1, object, *args[1..-1])
      else
        super
      end
    end
  end

  # Add mail to queue Notifier.send_later(:reply, Notification.first)
  def send_later(method, object, *args)
    Resque.enqueue(self.class, method, object.class.to_s, object.id, *args)
  end

  def perform(method, klass, id, *args)
    object  = klass.constantize.find(id)

    self.class.send(method, object, *args).deliver
  end
end