gistfile1.rb

require 'yaml'

module Delayed
  module Backend
    module Base
      def payload_object
        YAML::ENGINE.yamler = 'psych'
        @payload_object ||= YAML.load(self.handler)
      rescue TypeError, LoadError, NameError, ArgumentError => e
        raise DeserializationError,
          "Job failed to load: #{e.message}. Handler: #{handler.inspect}"
      end
    end
  end

  class PerformableMailer
    def perform
      double = object.is_a?( String ) ? object.constantize : object
      double.send(method_name, *args).deliver
    end
  end
end