From: Ryan Davis <ryand-ruby@...>
Date: 2012-12-05T19:58:53+09:00
Subject: Re: how to require specific version of gem in my project


On Dec 5, 2012, at 01:27 , Mallikarjuna Yaddala <lists@ruby-forum.com> wrote:

> Hi All,
> 
> I have installed two different versions of a gem (1.0.0 and 1.0.4)
> 
> 
> My code :
> 
> ===============================
> 
> require 'test' , '>= 1.3.6'

require doesn't take 2 args (as it doesn't makes sense to be able to require across 2+ versions of the same gem). From the rdoc:

	% ri require
	...
	=== Implementation from Kernel
	------------------------------------------------------------------------------
	  require(string)    => true or false
	...

You want to specify that at the gem level using #gem:

	% ri gem
	...
	(from gem rubygems-1.8.24)
	=== Implementation from Kernel
	------------------------------------------------------------------------------
	  gem(gem_name, *requirements)
	...

So you want:

	gem "test", ">= 1.3.6" # assuming the gem name is actually "test"
	require "test"         # assuming there is a file "test.rb" in the gem

BUT... also note that your version specifier above will NOT match either version you have installed.