Rails - Oct 2006 - [Fwd: [Rails-core] Strange behavior with session]

Hi,

when I create the following method inside a controller which has sessions
enabled, the result I
get ("nil") is not the one I am expecting (CGI::Session).
Has anybody an explanation for this strange behavior?

--- code
  def strange
    if nil
      raise "strange"
      session = "whatever"
    end
    render :text => session.inspect
  end
---

Thanks,

Marek


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On 10/3/06, Marek Kralewski <mck-HuhXT4aU5K6ELgA04lAiVw@public.gmane.org>
wrote:
>
> when I create the following method inside a controller which has sessions
> enabled, the result I
> get ("nil") is not the one I am expecting (CGI::Session).
> Has anybody an explanation for this strange behavior?
>
> --- code
>   def strange
>     if nil
>       raise "strange"
>       session = "whatever"
>     end
>     render :text => session.inspect
>   end
> ---

This is a Ruby quirk. It ''sees'' the local variable even if
it''s never
assigned when the program executes. For example:
>> a
NameError: undefined local variable or method `a'' for
#<Object:0x2aaaaab232e0>
        from (irb):1
>> if false; a = 1 end
=> nil
>> a
=> nil

jeremy


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Hi Jeremy,

thanks for your answer.

Am Dienstag, den 03.10.2006, 10:14 -0700 schrieb Jeremy Kemper:

> This is a Ruby quirk. It ''sees'' the local variable even
if it''s never
> assigned when the program executes. For example: 
I understand. So a local variable is defined regardless of the program
flow. But why is a local variable assigned, when the method
self.session= exists? That made me some serious headache...

Thanks, Marek



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On 10/3/06, Marek Kralewski <mck-HuhXT4aU5K6ELgA04lAiVw@public.gmane.org>
wrote:
>
>
> Hi Jeremy,
>
> thanks for your answer.
>
> Am Dienstag, den 03.10.2006, 10:14 -0700 schrieb Jeremy Kemper:
>
>
> > This is a Ruby quirk. It ''sees'' the local variable
even if it''s never
> > assigned when the program executes. For example:
>
> I understand. So a local variable is defined regardless of the program
> flow. But why is a local variable assigned, when the method
> self.session= exists? That made me some serious headache...

Because in this ambiguous situation you may be assigning a local variable or
you may be calling a writer method. Ruby interprets it as assigning a local
variable.

jeremy


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