class StatReferrer < Sequel::Model
  many_to_one :site
  RETAINMENT_PERIOD = 7.days

  def self.create_or_get(site_id, url)
    opts = {site_id: site_id, url: url}
    stat_referrer = where(opts).where{created_at > RETAINMENT_PERIOD.ago}.first

    DB[table_name].lock('EXCLUSIVE') {
      stat_referrer = create opts.merge(created_at: Date.today)
    } if stat_referrer.nil?

    stat_referrer
  end
end