Unique views store in redis with daily rotation

redis_view_counter.rb

class RedisViewCounter

  attr_reader :object
  
  def initialize(object)
    @object = object
  end

  def register_view(fingerprint)
    created = !$redis.exists(daily_key)
    if $redis.sadd(daily_key, fingerprint)
      $redis.incr count_key
    end
    $redis.expire(daily_key, Time.now.seconds_until_end_of_day) if created
  end

  def count
    $redis.get(count_key).to_i
  end

  private

  def count_key
    "view_count_#{object.class.name}_#{object.id}"
  end

  def daily_key
    "daily_views_#{object.class.name}_#{object.id}_#{Date.today}".underscore
  end

end