Rails - May 2007 - running a shell command in the background from Rails

Hi

I need to call a method on one of my models in response to a form
being submitted that may take quite some time to run. I''d like to just
use script/runner and have it run in the background returning
immediately. The following seems like it should work but instead it
waits for the command to finish:

    `#{RAILS_ROOT}/script/runner \"Project.my_method\" &`

With the ''&'' it returns immediately when run from the
terminal but not
when called from Rails.

I''ve had a look at backgroundrb but that seems far too complicated for
the simple thing I''m trying to achieve. Is there a way I can run a
shell command like this but have it return immediately?

David North


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

On 5/16/07, David North
<davidnorth-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi
>
> I need to call a method on one of my models in response to a form
> being submitted that may take quite some time to run. I''d like to
just
> use script/runner and have it run in the background returning
> immediately. The following seems like it should work but instead it
> waits for the command to finish:
>
>     `#{RAILS_ROOT}/script/runner \"Project.my_method\" &`
>
> With the ''&'' it returns immediately when run from the
terminal but not
> when called from Rails.
Try using system() instead of backticks, and be sure to redirect
stderr and stdout to a file or to /dev/null.

   system "#{RAILS_ROOT}/script/runner Project.my_method >/dev/null
2>&1 &"

HTH

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Bob Showalter wrote:
>>     `#{RAILS_ROOT}/script/runner \"Project.my_method\" &`
>>
>> With the ''&'' it returns immediately when run from
the terminal but not
>> when called from Rails.
>
> Try using system() instead of backticks, and be sure to redirect
> stderr and stdout to a file or to /dev/null.
>
>   system "#{RAILS_ROOT}/script/runner Project.my_method >/dev/null
2>&1 &"
>
> HTH
nohup?

-- 
  Phlip
  http://flea.sourceforge.net/PiglegToo_1.html 


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

That works great, many thanks

David


On May 17, 1:49 am, "Bob Showalter"
<showa...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 5/16/07, David North
<davidno...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > Hi
>
> > I need to call a method on one of my models in response to a form
> > being submitted that may take quite some time to run. I''d
like to just
> > use script/runner and have it run in the background returning
> > immediately. The following seems like it should work but instead it
> > waits for the command to finish:
>
> >     `#{RAILS_ROOT}/script/runner \"Project.my_method\"
&`
>
> > With the ''&'' it returns immediately when run
from the terminal but not
> > when called from Rails.
>
> Try using system() instead of backticks, and be sure to redirect
> stderr and stdout to a file or to /dev/null.
>
>    system "#{RAILS_ROOT}/script/runner Project.my_method >/dev/null
2>&1 &"
>
> HTH

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---