Question

之前我从未使用过whenever应用。试着学习如何使用它来从控制器运行一个动作。这可能吗？

控制器

class EntriesController < ApplicationController


def index
  @entries = Entry.all
end

def scrape
    require 'open-uri'
    doc = Nokogiri::HTML(open("https://www.reddit.com/"))

    entries = doc.css('.entry')
    entriesArray = []
    entries.each do |entry|
      title = entry.css('p.title > a').text
      link = entry.css('p.title > a')[0]['href']
      entriesArray << Entry.new({ title: title, link: link })
    end

    if entriesArray.map(&:valid?)
      entriesArray.map(&:save!)
    end

    respond_to do |format|
      format.html { redirect_to entries_url, notice: 'Entries were successfully scraped.' }
      format.json { entriesArray.to_json }
    end
  end

end

配置/ schedule.rb

every 1.day, :at => "12:00pm" do 
    runner "Task.scrape"
end

Answer 1

它看起来不像任何参数。别忘了控制器只是Ruby对象：

EntriesController.new.scrape

Answer 2

将代码移动到单独的文件中，并在schedule.rb和控制器中重复使用：

# lib/reddit_scrapper.rb
require 'open-uri'

module RedditScrapper
  def self.scrape
    doc = Nokogiri::HTML(open("https://www.reddit.com/"))

    entries = doc.css('.entry')
    entriesArray = []
    entries.each do |entry|
      title = entry.css('p.title > a').text
      link = entry.css('p.title > a')[0]['href']
      entriesArray << Entry.new({ title: title, link: link })
    end

    if entriesArray.map(&:valid?)
      entriesArray.map(&:save!)
    end
  end
end

控制器的代码：

class EntriesController < ApplicationController
  def index
    @entries = Entry.all
  end

  def scrape
    RedditScrapper.scrape

    respond_to do |format|
      format.html { redirect_to entries_url, notice: 'Entries were successfully scraped.' }
      format.json { entriesArray.to_json }
    end
  end
end

每当任务：

every 1.day, :at => "12:00pm" do 
  runner "RedditScrapper.scrape"
end

如何在每次配置/计划中运行控制器的操作

2 个答案: