news_item.rb

def publish!
    self.posted_at = Time.now
    save!

    if($redis.get("last_tweet_time") != nil)
      last_tweet_time = Time.parse($redis.get("last_tweet_time"))
      
      if((last_tweet_time + 1.hour) > Time.now)
        schedule_time = last_tweet_time + 1.hour
        puts "Delaying to" + schedule_time.to_s
      else 
        schedule_time = Time.now
      end
    else 
      schedule_time = Time.now
    end

    $redis.set("last_tweet_time", schedule_time.asctime)
    
    Resque.enqueue_at(schedule_time, TweetNewsItem, self.id) if Rails.env.development?
  end