Check existence of DelayedJob records

dj_custom_job.rb

#A Custom job is a class with a method called perform
class User
  def perform
    #long running process
  end
end

#check existence of DelayedJob record
Delayed::Job.exists?(:handler => Delayed::Job.new(:payload_object => User.new).handler, :locked_at => nil)

dj_delay.rb

class User
  class << self

    def long_process(args)
      #long running process
    end

    def create_delayed_job_for_long_process(args)
      #check the existence of DelayedJob record
      unless Delayed::Job.exists?(:handler => Delayed::Job.new(:payload_object => Delayed::PerformableMethod.new(self, :request_without_send_later, Array.wrap(args))).handler, :locked_at => nil)
       self.delay.long_process(args)
      end
    end

  end
end