Uninitialized constant: String::StringIO

[Patrick Li]

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

 

[ara.t.howard]

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

require 'stringio'

a @ http://codeforpeople.com/

 

[Robert Klemme]

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

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

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

robert@fussel ~
$

Kind regards

robert

 

[Patrick Li]

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...)

 

[ara.t.howard]

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...)

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/

 

[Patrick Li]

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