我如何使用rufus-scheduler和Rails 4调用动态调度程序来调用一天中多次获取推文的方法

Question

I need to call tweeter api in a day with fixed time like 1PM, 3PM, 9AM.. I am using twiter gem and rufus-scheduler

Here is my model

class Feed < ActiveRecord::Base

  def self.latest
    order('created_at desc').take(500)
  end

  def self.pull_tweets
    $client.search("#ukraine", since_id: maximum(:tweet_id), count: 10).take(10).each do |tweet|

      create!(
        tweet_id: tweet.id,
        content: tweet.text,
        screen_name: tweet.user.screen_name,
        )

     end
 end

end

Here is the controller where i am using the scheduler to call pull_tweets

class FeedsController < ApplicationController

  def index

    scheduler = Rufus::Scheduler.new
    scheduler.schedule_every('60s') do
      Feed.pull_tweets
    end
   @tweets = Feed.latest
 end
end

Its working perfectly but how i can set multiple times like 1AM, 3PM, 9AM for scheduling the task from users input?

Answer 1

Simplify your controller to:

class FeedsController < ApplicationController
  def index
    @tweets = Feed.latest
  end
end

Then make sure you have a config/initializers/scheduler.rb that looks like:

require 'rufus-scheduler'

Rufus::Scheduler.singleton.every('60s') { Feed.pull_tweets }

So that you have a single scheduler for the whole Ruby process.

To answer your question:

require 'rufus-scheduler'

Rufus::Scheduler.singleton.cron('0 1,9,15 * * *') { Feed.pull_tweets }
  # pull tweets at 0100, 0900 and 1500

Your code is creating a rufus-scheduler instance each time a browser GETs /feeds, the code here has a single scheduler.