method refactor

  # An array of ids is returned for rake task output (see lib/tasks/doc_news.rake)
  def self.process_queued_for_sample!(time: Time.now)
    unprocessed.sample_sent_at_for(time).map do |digest|
      if digest.can_sample?
        digest.sample!
        digest.id
      end
    end
  end

  # An array of ids is returned for rake task output (see lib/tasks/doc_news.rake)
  def self.process_queued_for_final_delivery!(time: Time.now)
    sampled.final_sent_at_for(time).map do |digest|
      if digest.deliverable?
        digest.deliver!
        digest.id
      end
    end
  end