# Multiple Versions of Rails Installed

**URL:** <https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894>\
**Category:** Rails\
**Created:** [December 2, 2007, 3:52pm UTC](https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894 "2007-12-02T15:52:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gemblon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ee59a6/32.png) [@gemblon](https://www.ruby-forum.com/u/gemblon)\
**Post date:** [December 2, 2007, 3:52pm UTC](https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894/1 "2007-12-02T15:52:58Z")

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Can you have multiple Versions of Rails Installed?  
And if you do, how do you say to use a particular version?

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**Author:** ![gemblon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ee59a6/32.png) [@gemblon](https://www.ruby-forum.com/u/gemblon)\
**Post date:** [December 2, 2007, 4:03pm UTC](https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894/2 "2007-12-02T16:03:50Z")

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On 2 Dec 2007, at 14:52, Trent B. (gemblon) wrote:

> Can you have multiple Versions of Rails Installed?  
> And if you do, how do you say to use a particular version?

gems allows you to have multiple version of a gem. You environment.rb  
will have something like  
RAILS\_GEM\_VERSION = ‘1.2.3’ unless defined? RAILS\_GEM\_VERSION  
at the top, just change that as desired.  
Personally I always freeze my gems into vendor/rails, at which point  
this becomes a total non-issue.

Fred

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**Author:** ![gemblon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ee59a6/32.png) [@gemblon](https://www.ruby-forum.com/u/gemblon)\
**Post date:** [December 2, 2007, 4:48pm UTC](https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894/3 "2007-12-02T16:48:17Z")

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Frederick C. wrote:

> On 2 Dec 2007, at 14:52, Trent B. (gemblon) wrote:
> 
> > Can you have multiple Versions of Rails Installed?  
> > And if you do, how do you say to use a particular version?
> 
> gems allows you to have multiple version of a gem. You environment.rb  
> will have something like  
> RAILS\_GEM\_VERSION = ‘1.2.3’ unless defined? RAILS\_GEM\_VERSION  
> at the top, just change that as desired.  
> Personally I always freeze my gems into vendor/rails, at which point  
> this becomes a total non-issue.
> 
> Fred

thanks. you rock. Fred is really, Yoda, in disguise.

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**Author:** ![gemblon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ee59a6/32.png) [@gemblon](https://www.ruby-forum.com/u/gemblon)\
**Post date:** [December 2, 2007, 5:47pm UTC](https://www.ruby-forum.com/t/multiple-versions-of-rails-installed/121894/4 "2007-12-02T17:47:36Z")

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On Dec 2, 7:48 am, “Trent B. (gemblon)” \<rails-mailing-l…@andreas-  
[s.net](http://s.net)\> wrote:

> Frederick C. wrote:
> 
> > On 2 Dec 2007, at 14:52, Trent B. (gemblon) wrote:

> thanks. you rock. Fred is really, Yoda, in disguise.

i think it’s Matz or DHH or fake steve jobs. Or the guy that wrote  
the entire [about.com](http://about.com) site ;-p