From: Jason Roelofs <jameskilton@...>
Date: 2007-01-06T03:57:22+09:00
Subject: Re: A 'require' question

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require_gem 'gem_name', '>=1.2.3'

Though newest version of gems now has just

gem 'gem_name', '>=1.2.3'

Jason

On 1/5/07, bbiker <renard@nc.rr.com> wrote:
>
> When you have multiple versions of a gem, "require 'gemxxx'" loads in
> the latest version.
>
> How can you specify a specific version (or some other constraint)?
>
> The ri documentation for require is of no help.
>
> ---------------------------------------------------------
> Kernel#require
>      require(string)    => true or false
> ------------------------------------------------------------------------
> Ruby tries to load the library named _string_, returning +true+ if
> successful. If the filename does not resolve to an absolute path,
> it will be searched for in the directories listed in +$:+. If the
> file has the extension ``.rb'', it is loaded as a source file; if
> the extension is ``.so'', ``.o'', or ``.dll'', or whatever the
> default shared library extension is on the current platform, Ruby
> loads the shared library as a Ruby extension. Otherwise, Ruby tries
> adding ``.rb'', ``.so'', and so on to the name. The name of the
> loaded feature is added to the array in +$"+. A feature will not be
> loaded if it's name already appears in +$"+. However, the file name
> is not converted to an absolute path, so that ``+require
> 'a';require './a'+'' will load +a.rb+ twice.
>
>         require "my-library.rb"
>         require "db-driver"
>
>
>

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