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I am using the whenever gem, to handle my cron jobs. I have an events and bookings rails application where I have an events and a bookings table.

I want to send out a mailer, with all the bookings for an event to the event organizer an hour or so before the event's start time. But I am not able to find a way to that with the whenever gem.

Currently, I am just sending out all mailers at 9pm, and that works perfectly, but I that doesn't serve my use case, since different event organizers require it at different times

Raunak Joneja
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2 Answers2

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There is a way to run whenever dynamically. Just add this line to the top of your schedule.rb: 

require "/home/username/appname/config/environment.rb"

That allows you to use all your models class on the schedule.rb. For example: 

every 1.day, :at => (Booking.last.event_time - 1.hour).strftime('%I:%M %p') do
  ...
end

Also, you can use the environment variable to set the time too.

Don't forget update crontab when time change:

system 'bundle exec whenever --update-crontab'

But cron uses to run schedule jobs (commands or shell scripts) periodically at fixed times. So, whenever isn't better solution for you. As iGian wrote at his comment - check this topic: delay job(sidekiq or similar) is more relevant to that job.

Leo
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  • This works perfectly, only thing, the strftime format you provided didnt work for some reason. The format that worked for me was .strftime('%I:%M%P') – Raunak Joneja May 29 '18 at 08:41
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@Leo answered it correctly, but adding require File.expand_path(File.dirname(__FILE__) + "/environment") at the beginning of your schedule.rb will make it more versatile and easier to read.

a3y3
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