gistfile1.rb

  def setup_sightings_for_rollup
    timespans = [ # [start_time, end_time, quantity, values]
      [1.minute.ago, Time.now, 250, [1]],
      [1.hour.ago, 1.minute.ago, 5000, [1]],
      [1.day.ago, 1.hour.ago, 1500, [1, 2]],
      [1.week.ago, 1.day.ago, 1000, [1, 2]],
      [3.weeks.ago, 1.week.ago, 500, [1, 2]]
    ]
    cities = { # city => divisor (for quantity)
      'Atlanta' => 1,
      'Roswell' => 10
    }

    observers = %w(Mike Bill Mary Joe)
    format = Factory :format_ufo_sightings
    Tempfile.open 'ufo_sightings' do |file|
      cities.each do |city, divisor|
        timespans.each do |start_time, end_time, quantity, values|
          duration = end_time - 1.second - start_time
          quantity /= divisor
          quantity.times do |i|
            time = start_time + duration * i / (quantity - 1)
            values[i % values.length].times do
              file.puts "#{time.to_i} #{(time.to_i / 60) * 60} #{(time.to_i / 3600) * 3600} #{city} #{observers.rand}"
            end
          end
        end
      end
      file.flush
      format.load file.path
    end
  end