Rails - Sep 2009 - Anyone know why __END__ and DATA don't work in Rails?

When writing Ruby you have the option to end the file early with
__END__. Anything after the __END__ is assigned to a constant called
DATA which is available within the file.

I recently tried using this in Rails and it didn''t work. Instead I get
an uninitialized constant exception. Anyone know why?

Has it been disabled in Rails?

thanks

Gavin

On Sep 11, 12:12 pm, Gavin
<ga...-YMj/zd8x6QpKMzDMP321V2ksYUyLi9NM@public.gmane.org>
wrote:
> When writing Ruby you have the option to end the file early with
> __END__. Anything after the __END__ is assigned to a constant called
> DATA which is available within the file.
>
> I recently tried using this in Rails and it didn''t work. Instead I
get
> an uninitialized constant exception. Anyone know why?
>
> Has it been disabled in Rails?
>
> thanks
>
> Gavin
The DATA constant is only created for the running script. Thus,
require''d files do not get the DATA constant.

see the following:

xeno@amrita:~  $ cat data.rb
puts DATA.read
__END__
helloooooo
xeno@amrita:~  $ cat d2.rb
require ''data''
xeno@amrita:~  $ ruby data.rb
helloooooo
xeno@amrita:~  $ ruby d2.rb
/home/xeno/data.rb:1:in `<top (required)>'': uninitialized
constant
DATA (NameError)
        from d2.rb:1:in `require''
        from d2.rb:1:in `<main>''
xeno@amrita:~  $

That makes sense!

Thanks for that!


On Sep 11, 7:33 pm, pharrington
<xenogene...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Sep 11, 12:12 pm, Gavin
<ga...-YMj/zd8x6QpKMzDMP321V2ksYUyLi9NM@public.gmane.org> wrote:
>
> > When writing Ruby you have the option to end the file early with
> > __END__. Anything after the __END__ is assigned to a constant called
> > DATA which is available within the file.
>
> > I recently tried using this in Rails and it didn''t work.
Instead I get
> > an uninitialized constant exception. Anyone know why?
>
> > Has it been disabled in Rails?
>
> > thanks
>
> > Gavin
>
> The DATA constant is only created for the running script. Thus,
> require''d files do not get the DATA constant.
>
> see the following:
>
> xeno@amrita:~  $ cat data.rb
> puts DATA.read
> __END__
> helloooooo
> xeno@amrita:~  $ cat d2.rb
> require ''data''
> xeno@amrita:~  $ ruby data.rb
> helloooooo
> xeno@amrita:~  $ ruby d2.rb
> /home/xeno/data.rb:1:in `<top (required)>'': uninitialized
constant
> DATA (NameError)
>         from d2.rb:1:in `require''
>         from d2.rb:1:in `<main>''
> xeno@amrita:~  $