From: Brian Candler <b.candler@...>
Date: 2009-01-22T17:42:01+09:00
Subject: Re: class doesn't know about calling program's libraries?

P.S. It would be extremely helpful if you could boil this down to a very 
short program which replicates the problem, and then post that program 
in its entirety.

For example, when I write this:

---- 8< -----
# foo.rb
def main
  Foo.new.bar
end

class Foo
  def bar
    Readline::readline(">>")
  end
end

%w(readline).each{ |lib| require lib }
main
---- 8< -----

and type "ruby foo.rb" then it runs perfectly. The question is, what's 
different between this and what you posted? Does this program run 
correctly for you? If so, I suspect the problem lies somewhere outside 
what you posted.

This whole process is extremely useful:

1. In the act of minimising the problem, you'll probably find the 
solution yourself.

2. Even if you don't, then you have made it as easy as possible for 
other people on the list to understand and/or replicate the problem, and 
hence to find the solution.

The question then becomes simply: "The following piece of code raises 
the exception shown. Why?" Since line numbers in the exception will 
match up exactly to the posted code, an experienced coder will likely 
see the problem at once.

Making life easy for other people makes them much more inclined to help 
you (both now and in the future), as does demonstrating that you've done 
your own homework. There's a very good article on this topic at
http://www.catb.org/~esr/faqs/smart-questions.html

Regards,

Brian.
-- 
Posted via http://www.ruby-forum.com/.