Dynamic requires

ruby-talk
1

I don't want to go into to much boring detail as to why I am trying to do
this... but why doesn't this work?

begin
  require 'foo'
rescue
  class Foo
  end
end

Instead of rescuing the error (when 'foo' is not found), it still gets
thrown.

regards,
Matt

2

Hi --

···

On Sun, 4 Nov 2007, Belorion wrote:

I don't want to go into to much boring detail as to why I am trying to do
this... but why doesn't this work?

begin
require 'foo'
rescue
class Foo
end
end

Instead of rescuing the error (when 'foo' is not found), it still gets
thrown.

It's because the bare "rescue" only rescues errors that are
descendants of StandardError. Otherwise you have to specify the ones
you want:

   rescue LoadError

David

--
Upcoming training by David A. Black/Ruby Power and Light, LLC:
   * Advancing With Rails, Edison, NJ, November 6-9
   * Advancing With Rails, Berlin, Germany, November 19-22
   * Intro to Rails, London, UK, December 3-6 (by Skills Matter)
See http://www.rubypal.com for details!

3

I did not know that! (obviously).

Much appreciated.

Matt

···

On 11/3/07, David A. Black <dblack@rubypal.com> wrote:

Hi --

On Sun, 4 Nov 2007, Belorion wrote:

> I don't want to go into to much boring detail as to why I am trying to
do
> this... but why doesn't this work?
>
> begin
> require 'foo'
> rescue
> class Foo
> end
> end
>
> Instead of rescuing the error (when 'foo' is not found), it still gets
> thrown.

It's because the bare "rescue" only rescues errors that are
descendants of StandardError. Otherwise you have to specify the ones
you want:

   rescue LoadError

David

--
Upcoming training by David A. Black/Ruby Power and Light, LLC:
   * Advancing With Rails, Edison, NJ, November 6-9
   * Advancing With Rails, Berlin, Germany, November 19-22
   * Intro to Rails, London, UK, December 3-6 (by Skills Matter)
See http://www.rubypal.com for details!