Uninitialized constant: String::StringIO

ruby-talk
1

Hi,
I'm having a hard time spotting my bug in this code.
When it runs it gives me:
uninitialized constant String::StringIO (NameError)

Am I missing something? StringIO is a global constant. Why can't ruby
find it?

class String
  def self.fromURL(string)
    string = string.string if string.is_a?(StringIO)
    CGI.unescape(string)
  end
end

Thanks a lot for your help
  -Patrick

···

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2

require 'stringio'

a @ http://codeforpeople.com/

···

On Aug 14, 2008, at 10:43 AM, Patrick Li wrote:

Hi,
I'm having a hard time spotting my bug in this code.
When it runs it gives me:
uninitialized constant String::StringIO (NameError)

Am I missing something? StringIO is a global constant. Why can't ruby
find it?

class String
def self.fromURL(string)
   string = string.string if string.is_a?(StringIO)
   CGI.unescape(string)
end
end

Thanks a lot for your help
-Patrick
-- Posted via http://www.ruby-forum.com/\.

--
we can deny everything, except that we have the possibility of being better. simply reflect on that.
h.h. the 14th dalai lama

3

$ ruby -e 'p StringIO'
-e:1: uninitialized constant StringIO (NameError)

robert@fussel ~
$ ruby -r stringio -e 'p StringIO'
StringIO

robert@fussel ~
$

Kind regards

  robert

···

On 14.08.2008 18:43, Patrick Li wrote:

Hi,
I'm having a hard time spotting my bug in this code.
When it runs it gives me:
uninitialized constant String::StringIO (NameError)

Am I missing something? StringIO is a global constant. Why can't ruby
find it?

class String
  def self.fromURL(string)
    string = string.string if string.is_a?(StringIO)
    CGI.unescape(string)
  end
end

4

Thanks Ara,

Just out of curiosity, why is it that I need
require "stringio" when running as a script under Apache, but not when I
run under irb?

Is there a way to tell when I need to require a library and when I
don't? (ie. from documentation, etc...)

···

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5

irb simply had already required it. there is no general way to tell but, in this case you could check $LOADED_FEATURES

or, more simply

require 'stringio' unless defined?(StringIO)

but the require never hurts so just do it anyhow

a @ http://codeforpeople.com/

···

On Aug 14, 2008, at 10:57 AM, Patrick Li wrote:

Thanks Ara,

Just out of curiosity, why is it that I need
require "stringio" when running as a script under Apache, but not when I
run under irb?

Is there a way to tell when I need to require a library and when I
don't? (ie. from documentation, etc...)

--
we can deny everything, except that we have the possibility of being better. simply reflect on that.
h.h. the 14th dalai lama

6

Okay, I'll keep that in mind.
Thanks for your help Ara, and Klemme

···

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