Ruby on Rails

On 23 March 2013 15:15, Jodi Showers <jodi@homestars.com> wrote:
> for regularly scheduled jobs, I use a mixture of cron (to create a delayed
> job), and the delayed_job itself
>
> the crontab instance is very light, just a small (non-rails) rb script to
> insert the delayed_job in the delayed_jobs table
>
> then the delayed_job instance will pickup the job and run it
>
> in your instance, I would create a class method on the Test model -
> something like
>
> def self.remove_old_unpublished
>   delete_all(["created_at < ? and state in('unpublished')", 24.hours.ago])
> end
>
> cron entry like this:
> 05 1 * * * cd /path/to/current && RAILS_ENV=production
> /path/to/current/lib/delayed_job_cron_jobs/create_delayed_job.rb --model
> "Test" --method "remove_old_unpublished" --queue "general" --arguments
> "{:any_argument => 42}"
>
> the following gist is a script to insert delayed_jobs from cron
> https://gist.github.com/jshow/5228049
>
> fyi, the reason to take this route over the simpler rake route (run rake
> task from cron) is performance and memory usage - this method will save you
> a bunch of both.

I am always suspicious of the idea of doing something in a more
complex way in order to save resources.  It is only worth spending the
additional time developing the solution if computing resources are
likely to be an issue.  Computing resources are usually cheaper than
human resources.

Colin

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