Monkeypatch DJ to make payload_object exception-safe

delayed_job_990_monkeypatch.rb

## Monkeypatch payload_object like https://github.com/collectiveidea/delayed_job/pull/990
module Delayed
  module Backend
    class InvalidPayload
      ParseObjectFromYaml = %r{\!ruby/\w+\:([^\s]+)} # rubocop:disable ConstantName

      def initialize(handler, exception)
        @handler   = handler
        @exception = deserialization_error(exception)
      end

      def display_name
        result = ParseObjectFromYaml.match(@handler)
        result && result[1] || self.class.name
      end

      def perform
        raise @exception
      end

      def deserialization_error(e)
        return e if e.is_a?(DeserializationError)
        DeserializationError.new "Job failed to load: #{e.message}. Handler: #{@handler.inspect}"
      end
    end
  end
end

module Delayed
  module Backend
    module Base
      def payload_object
        return @payload_object if @payload_object
        @payload_object = YAML.load_dj(handler)
        unless @payload_object.respond_to?(:perform)
          @payload_object = Backend::InvalidPayload.new(handler, NoMethodError.new("undefined method `perform' for #{@payload_object.inspect}"))
        end
        @payload_object
      rescue Exception => e # rubocop:disable RescueException
        @payload_object = Backend::InvalidPayload.new(handler, e)
      end
    end
  end
end
## End Monkeypatch #990