async.rb

require 'active_support/concern'

module Asyncable
  extend ActiveSupport::Concern

  ASYNC_REGEX = Regexp.new(/^async_(.+)$/)

  included do
    include Sidekiq::Worker

    def method_missing(method, *args)
      if method.to_s =~ ASYNC_REGEX && respond_to?(method)
        self.class.send(:define_method, method) do |*arguments|
          Sidekiq::Client.enqueue(self.class, self._id, $1, *arguments)
        end
        self.send(method, *args)
      else
        super
      end
    end

    def respond_to?(method, *args)
      if method.to_s =~ ASYNC_REGEX
        super($1, true)
      else
        super(method, *args)
      end
    end

    def perform(id, *args)
      begin
        self.class.find(id).send(*args)
      rescue Exception => e
        Raygun.track_exception(e)
        raise e
      end
    end
  end
end