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rubyruby-on-rails-3ruby-on-rails-4whenever

whenever gem is not working for every 2 seconds

I have implemented whenever gem for my backend crons jobs which is working good when I try something like

every 2.seconds do
  rake "my:rake:task"
end

I get this error

`parse_time': Time must be in minutes or higher (ArgumentError)

I really want to run this task after every few seconds how can I do this.

Solution

  • You cannot do this with the whenever gem.

    Under the hood, the whenever gem simply creates a cron job. These can only be configured at a minimum granularity of per-minute.

    What you could do instead is write a shell script with an infinite loop that runs your task, and then sleeps for 2 seconds. However, I would advise against it - running something this frequently feels wrong. There's probably a much cleaner approach, e.g. running your code as an after_save hook?