A cron job for rails: best practices?

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I’ve used the extremely popular Whenever on projects that rely heavily on scheduled tasks, and it’s great. It gives you a nice DSL to define your scheduled tasks instead of having to deal with crontab format. From the README:

Whenever is a Ruby gem that provides a
clear syntax for writing and deploying
cron jobs.

Example from the README:

every 3.hours do
  runner "MyModel.some_process"       
  rake "my:rake:task"                 
  command "/usr/bin/my_great_command"
end

every 1.day, :at => '4:30 am' do 
  runner "MyModel.task_to_run_at_four_thirty_in_the_morning"
end

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