Rails - Apr 2010 - ruby script - how to write one that deals with different environment?

hi guys,

 I would like to write a script that is runned by cron. It will update
multiple entries.

 Any guides for this?
I can''t figure out how do we choose which ruby environment (ie.
development/test/production) in the script
and also, how do I access  models in the script (which is also used by
my rails application)?

thanks

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The easiest way may be to have a class with a class method, e.g.

class FooRunner
  def self.run
    ...
  end
end

And then call:

/path/to/my/app/script/runner -e production FooRunner.run

from Cron.

Cheers,


Andy

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On 6 April 2010 08:32, ct9a
<anexiole-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> hi guys,
>
>  I would like to write a script that is runned by cron. It will update
> multiple entries.
>
>  Any guides for this?
> I can''t figure out how do we choose which ruby environment (ie.
> development/test/production) in the script
> and also, how do I access  models in the script (which is also used by
> my rails application)?
>
> thanks
>
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All you need is access to the RAILS_ENV constant. For example this script

-- x.rb--
puts RAILS_ENV
----

When run produces the following output:

$ ruby script/runner -e production x.rb
production
$ ruby script/runner -e development x.rb
development
$ ruby script/runner -e test x.rb
test

for any environment that you have defined.

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Cool but how abt accessing the models? Andy gave a solution but i want
to see what others think

On 4/6/10, Peter Hickman
<peterhickman386-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> All you need is access to the RAILS_ENV constant. For example this script
>
> -- x.rb--
> puts RAILS_ENV
> ----
>
> When run produces the following output:
>
> $ ruby script/runner -e production x.rb
> production
> $ ruby script/runner -e development x.rb
> development
> $ ruby script/runner -e test x.rb
> test
>
> for any environment that you have defined.
>
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Regards,
Gordon Yeong

In matters of style, swim with the current,
In matters of principle, stand like a rock.
  - Thomas Jefferson

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  - Evan Esar

I never argue with idiots anymore. They have brought me down to their
levels and beaten me with their experience.
- Gordon Yeong

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On 6 April 2010 10:40, Gordon Yeong
<anexiole-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Cool but how abt accessing the models? Andy gave a solution but i want
> to see what others think
>
You should just be able to access the models normally (i.e. just use the
class, without needing to require anything) if you''re using
script/runner.

If you want to do it with a raw Ruby script (rather than using
script/runner), you''ll have to include RubyGems, ActiveRecord and point
ActiveRecord at the database.yml section, load all the models found below
the specific part.

To be honest, it''s much easier just to use script/runner.

Cheers,


Andy

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If you use script/runner then just use them as you normal would.

Scripts run from script/runner run as normal rails application so all the
same setup that the web application has will be provided for your script.

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hi, Andy and Peter,
 Thanks for the feedback :)
 i will try it out :)

Regards,
Gordon Yeong

On 6 April 2010 19:55, Peter Hickman
<peterhickman386-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> If you use script/runner then just use them as you normal would.
>
> Scripts run from script/runner run as normal rails application so all the
> same setup that the web application has will be provided for your script.
>
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> If you use script/runner then just use them as you normal would.
Just out of curiosity couldn''t you just to a rake task instead and call
that from cron?

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guys, in addition to Peter''s reply, here''s a good reference
for
script/runner.


On 6 April 2010 19:55, Peter Hickman
<peterhickman386-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> If you use script/runner then just use them as you normal would.
>
> Scripts run from script/runner run as normal rails application so all the
> same setup that the web application has will be provided for your script.
>
> --
>
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If you set up a rake task in lib/tasks/your_cron_job.rake with
something like this

namespace :your_cron_job do
   desc "describe the task"
   task :every_five_minutes => :environment do
       @post = Post.new
   end
end

you can add it manually to the cron by typing ''crontab -e''
which opens
the file for editing (*nix only)
crontab -e

first specify how often you want the job to run... in this case every
5 minutes "*/5 * * * *" along with correct paths to app and rake, set
the RAILS_ENV and task name to execute. Cron is just a file so you''ll
enter all the info for the job on one line like so... (if you don''t
have a default editor set up already it will prompt you to do so
before entering in this command).

*/5 * * * * cd /var/www/my_ror_application  && /usr/bin/rake
RAILS_ENV=production your_cron_job:every_five_minutes

More info here
http://seanbehan.com/programming/set-cron-job-to-run-every-five-minutes-for-a-ruby-on-rails-rake-task/
There are more elegant approaches to this problem. This is just the
quick and dirty.

On Apr 6, 3:32 am, ct9a <anexi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> hi guys,
>
>  I would like to write a script that is runned by cron. It will update
> multiple entries.
>
>  Any guides for this?
> I can''t figure out how do we choose which ruby environment (ie.
> development/test/production) in the script
> and also, how do I access  models in the script (which is also used by
> my rails application)?
>
> thanks
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hi there, bseanvt,

   The thought of using the rake task is good but it''s not applicable
to my situation whereby I am just running this script after each run
of thinking_sphinx:index which takes place every 20 mins.

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http://www.ameravant.com/posts/recurring-tasks-in-ruby-on-rails-using-runner-and-cron-jobs

On Apr 6, 9:49 pm, Gordon Yeong
<anexi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> guys, in addition to Peter''s reply, here''s a good
reference for
> script/runner.
>
> On 6 April 2010 19:55, Peter Hickman
<peterhickman...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>
> > If you use script/runner then just use them as you normal would.
>
> > Scripts run from script/runner run as normal rails application so all
the
> > same setup that the web application has will be provided for your
script.
>
> > --
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