gistfile1.txt

# sample stats recording code

      base = "w:#{site_id}:#{word}"

      # hits per year
      REDIS.incr "#{base}:#{created_at.year}"
      
      # hits per month
      REDIS.incr "#{base}:#{created_at.month}-#{created_at.year}"

      # hits per day
      REDIS.incr "#{base}:#{created_at.day}-#{created_at.month}-#{created_at.year}"
      
      # hits by hour-of-day this month
      REDIS.incr "#{base}:#{created_at.hour}h#{created_at.month}-#{created_at.year}"

So then to get the list of words for this month there's very little aggregation:

    REDIS.sort wordlist, { :by => "w:#{site_id}:*:#{end_date.month}-#{end_date.year}", :order => "DESC" }