Backgroundrb devel - Sep 2008 - [Help] How to pass multiple arguments to a method in a worker?

Hi, guys,
 I ran into a problem while I tried to pass more than one parameters to 
a method in the worker class, it fails, from the backgroundrb log, I 
found that:

   You have a nil object when you didn''t expect it!
   You might have expected an instance of ActiveRecord::Base.
   The error occurred while evaluating nil.[]

Seems the args is nil, but a hash I passed in my controller. From the 
post: 
http://rubyforge.org/pipermail/backgroundrb-devel/2008-April/001668.html, 
it should be a hash if there are multiple arguments. Here''s what I did:

In my controller:
 def blah
   MiddleMan.worker(:hard_worker).send_mail(:args => {:recipient => 
''blahblah at gmail.com'', :subject =>
''BlahBlah''})
 end

In my worker class:
 def send_mail(args)
   emailer.send_mail(args[:recipient], args[:subject])
 end


Is there anything wrong?

Additional info:
ruby-1.8.6
backgroundrb 1.0.4


All the best,
Hao Liu

On Wed, 2008-09-03 at 17:06 +0800, Hao Liu wrote:
> Hi, guys,
>  I ran into a problem while I tried to pass more than one parameters to 
> a method in the worker class, it fails, from the backgroundrb log, I 
> found that:
> 
>    You have a nil object when you didn''t expect it!
>    You might have expected an instance of ActiveRecord::Base.
>    The error occurred while evaluating nil.[]
> 
> Seems the args is nil, but a hash I passed in my controller. From the 
> post: 
> http://rubyforge.org/pipermail/backgroundrb-devel/2008-April/001668.html, 
> it should be a hash if there are multiple arguments. Here''s what I
did:
> 
> In my controller:
>  def blah
>    MiddleMan.worker(:hard_worker).send_mail(:args => {:recipient => 
> ''blahblah at gmail.com'', :subject =>
''BlahBlah''})
>  end
> 
> In my worker class:
>  def send_mail(args)
>    emailer.send_mail(args[:recipient], args[:subject])
>  end
Err, because its ":arg" not ":args" , hence:

MiddleMan.worker(:hard_worker).send_mail(:arg => {:recipient =>
''blahblah at gmail.com'', :subject =>
''BlahBlah''})

I thought, I had it documented here:

http://backgroundrb.rubyforge.org/rails/