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Scheduled Cron Jobs with the Whenever Gem Discussion

Francisco Quintero ·

Hey!

I've used the gem but know I understand it a bit more. Just one question. The flags -l and -c in "...bin/bash..." are crontab flags or bash flags?

Thanks a lot!

Those would be flags for bash, not cron itself. -l helps make sure your command for runs in a login shell so everything runs as expected and -c just says "hey we're passing the command through as an argument instead of running a script.

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Could this be used in some way so that if a user were signed in to an app, and wanted to configure some sort of email notification to go out after a certain time after an event, or similarly set some sort of scheduled date/time to send out an email? I'm guessing having a cron to run every minute which would trigger a script to check for such a schedule or delayed send?

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Hi, I have just created arask to be an effortless way to regularly run tasks in Rails. Just like cron. Much easier to set up though.
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For anyone who wants to use Models in tasks, you should load your environment on your task to load them before using them on the code as in:

task example: :environment do
end
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Hey,
I have implement schedule tasks to existing project using rails 4, when i rake tasks on development mode works and database updated, but when i rake tasks on production server it's work but database not updated.
Here is my code

// schedule.rb

every :hour do
  rake "profile_update:inactive"
end
//profile_update.rake

namespace :profile_update do
  desc "Update gps status profiles"
  task inactive: :environment do
    @profile_short = Heartrate.select('Date_Format(TIMEDIFF(now(), MAX(heartrates.start_time)), "%H") selisih_date, profiles.id, MAX(heartrates.start_time) start_time').joins(:profile).where('heartrates.start_time BETWEEN ? AND ?', DateTime.now.end_of_day-1, DateTime.now.end_of_day).where('profiles.gps_status = 1').group(:profile_id).order('profiles.id ASC')
      if @profile_short.present?
      @profile_short.each do |profile|
        if profile.selisih_date.to_i < 1
          cek_safety =  SafetyAlert.select('Date_Format(TIMEDIFF(now(), created_at), "%H") selisih_date_safety').where(profile_id: profile.id).where('created_at BETWEEN ? AND ?', profile.start_time, DateTime.now.end_of_day).last
          if cek_safety.present?
          else
            if profile.selisih_date.to_i >= 1
              Profile.where(id: profile.profile_id).update_all(gps_status: 0)
            end
          end
        else
          cek_safety =  SafetyAlert.select('Date_Format(TIMEDIFF(now(), created_at), "%H") selisih_date_safety').where(profile_id: profile.id).where('created_at BETWEEN ? AND ?', profile.start_time, DateTime.now.end_of_day).last
          if cek_safety.present?
            if cek_safety.selisih_date_safety.to_i >= 1
              Profile.where(id: profile.id).update_all(gps_status: 0)
            end
          else
            Profile.where(id: profile.id).update_all(gps_status: 0)
          end
        end
      end
    end
  end

end
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