From: Brian Candler <b.candler@...>
Date: 2010-06-12T01:18:37+09:00
Subject: Re: require  command  problem

Pen Ttt wrote:
> i have write a class ,use command to put in the
> /usr/lib/ruby/1.8/rubygems/Webmovie.rb

But /usr/local/lib/1.8/rubygems is not in the load path (i.e. ruby 
doesn't look for files there), so ruby won't find it.

$ irb --simple-prompt
>> $LOAD_PATH
=> ["/usr/local/lib/site_ruby/1.8", 
"/usr/local/lib/site_ruby/1.8/x86_64-linux", "/usr/local/lib/site_ruby", 
"/usr/lib/ruby/vendor_ruby/1.8", 
"/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux", 
"/usr/lib/ruby/vendor_ruby", "/usr/lib/ruby/1.8", 
"/usr/lib/ruby/1.8/x86_64-linux", "."]

On your system, /usr/local/lib/site_ruby is probably the appropriate 
place to put ad-hoc libraries. Otherwise, your program can choose the 
location:

  $LOAD_PATH.unshift "/path/to/my/lib"

rubygems itself does add things to $LOAD_PATH, but they typically are of 
the form /usr/lib/ruby/gems/1.8/gems/<appname>-<ver>/lib. If you want 
your library to go here, then package it up as a gem, and install the 
gem. (For Ubuntu, with rubygems installed using apt-get, it'll be 
/var/lib/gems/1.8/...)

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