每当 gem 设置 cron 作业时使用

Question

我想设置一个cron job 来删除两分钟以上的屏幕截图，并让 cron 作业每两分钟运行一次。

schedule.rb 文件的内容

every 2.minutes do
  runner 'screenshot.delete_old', output: {error: "#{path}/log/error.log", standard: "#{path}/log/cron.log"}
end

模型截图.rb文件内容

def self.delete_old
       # @old_screenshots = Screenshot.where('Screenshot.created_at < ?', Time.now)
        #@old_screenshots.delete_all
        #@screenshot.delete_old
        #Screenshot.delete
        screenshot_ids = screenshot.find(:all, :conditions =>            ["created_at ", 2.minutes.ago])
        if screenshot_ids.size > 0
             screenshot.destroy(screenshot_ids)
             puts "#{screenshot_ids.size} screenshots have been deleted!"
        end
    end

我更新了 crontab 文件并运行了 rails 服务器，期望删除截图。但它不起作用。有人可以帮我解决这个问题吗？谢谢。

Answer 1

Ruby 中的类的首字母应该大写，也许你应该试试：

every 2.minutes do
  runner 'Screenshot.delete_old', output: {error: "#{path}/log/error.log", standard: "#{path}/log/cron.log"}
end

和你的模型：

def self.delete_old
  screenshot_ids = Screenshot.where('created_at < ?', 2.minutes.ago))
  if screenshot_ids.size > 0
    Screenshot.destroy(screenshot_ids)
    puts "#{screenshot_ids.size} screenshots have been deleted!"
  end
end