gistfile1.rb

class Simulation < ActiveRecord::Base
  @queue = :simulation
  @unique_jobs = true
  @delayed_jobs = true

  def simulate
    Resque.enable_delay(:simulation) #call this elsewhere in a production app
    Resque.enqueue(Simulation, {:_id => self.id, :delay_until => Time.now + 1800})
  end 

  def self.perform(options)
    sim = Simulation.find options['id']
    sim.actually_simulate
  end

  def actually_simulate
    sleep 5
    self.results = rand 100 + 1
    save
  end
end