# Rails Version

**URL:** <https://www.ruby-forum.com/t/rails-version/163317>\
**Category:** Rails\
**Created:** [March 19, 2009, 7:13am UTC](https://www.ruby-forum.com/t/rails-version/163317 "2009-03-19T07:13:34Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![NARAYANAN\_CJ](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/a9adbd/32.png) [@NARAYANAN\_CJ](https://www.ruby-forum.com/u/NARAYANAN_CJ)\
**Post date:** [March 19, 2009, 7:13am UTC](https://www.ruby-forum.com/t/rails-version/163317/1 "2009-03-19T07:13:34Z")

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hi there,

Can i have two version of rails 2.2.2 and 1.2.3 on the same executable  
location. Is that possible

regards,

Narayanan.cj.

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**Author:** ![NARAYANAN\_CJ](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/a9adbd/32.png) [@NARAYANAN\_CJ](https://www.ruby-forum.com/u/NARAYANAN_CJ)\
**Post date:** [March 19, 2009, 7:56am UTC](https://www.ruby-forum.com/t/rails-version/163317/2 "2009-03-19T07:56:20Z")

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On 19 Mar., 07:12, NARAYANAN CJ [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> hi there,
> 
> Can i have two version of rails 2.2.2 and 1.2.3 on the same executable  
> location. Is that possible

It is possible to have two version of the Rails gem installed but the  
“rails” executable will always be replaced when installing another  
version of Rails. So you probably can’t have two versions of Rails in  
the same executable.

–  
Cheers,  
David K.  
[http://twitter.com/rubyguy](http://twitter.com/rubyguy)

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<div class="post-metadata">

**Author:** ![NARAYANAN\_CJ](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/a9adbd/32.png) [@NARAYANAN\_CJ](https://www.ruby-forum.com/u/NARAYANAN_CJ)\
**Post date:** [March 19, 2009, 11:10am UTC](https://www.ruby-forum.com/t/rails-version/163317/3 "2009-03-19T11:10:49Z")

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On Mar 19, 6:55 am, “removed\_email\_address@domain.invalid” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> the same executable.  
> Your average executable from a rubygem is just a tiny stub that loads  
> the gem in question and runs some entry point in it, so you can  
> usually do (in particular for rails)

rails _2.1.1_ someproject

to run the 2.1.1 version of the rails app generator.

Fred

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<div class="post-metadata">

**Author:** ![NARAYANAN\_CJ](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/a9adbd/32.png) [@NARAYANAN\_CJ](https://www.ruby-forum.com/u/NARAYANAN_CJ)\
**Post date:** [March 19, 2009, 6:07pm UTC](https://www.ruby-forum.com/t/rails-version/163317/4 "2009-03-19T18:07:28Z")

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thank you guys

i was actually having an application which was built on rails version  
1.2.3  
and i have other application on my desktops running with rails version  
2.2.2

when i ran ruby script/server , i was told to change the setting in the  
enviornment.rb to change to rails version=1.2.3

and i tried changing that but has no effect as it doesnt have the rails  
version 1.2.3

and later ,i was doing gem install rails -v=1.2.3 , after insalling  
when i  
typed rails -v its shown me rails 2.2.2

but when i tried removing using the command gem uninstall rails it was  
asking me to remove which version , so i am sure that my rails different  
version was installed

then later i tried to run my application ruby script/server after  
changing  
the version of rails as 1.2.3 in the environment.rb file wow,i got my  
app  
working with out any probs

thank you all guys for the help

regards  
narayanan cj

On Thu, Mar 19, 2009 at 3:39 PM, Frederick C. \<

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<div class="post-metadata">

**Author:** ![NARAYANAN\_CJ](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/a9adbd/32.png) [@NARAYANAN\_CJ](https://www.ruby-forum.com/u/NARAYANAN_CJ)\
**Post date:** [March 20, 2009, 12:05am UTC](https://www.ruby-forum.com/t/rails-version/163317/5 "2009-03-20T00:05:30Z")

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You can have as many versions of rails installed on your machine as  
you want. The key to running a particular version of rails is in the  
environment.rb file where you can specify the version that you are  
running. So I have both Rails 2.1.2 and 2.3.1 installed on the same  
machine and I switch to the desired version by setting it in the  
environment.rb as shown below:

# Specifies gem version of Rails to use when vendor/rails is not

present  
RAILS\_GEM\_VERSION = ‘2.1.2’ unless defined? RAILS\_GEM\_VERSION

As the comment says above, you can even freeze a particular version of  
rails in your vendor/rails directory and that will be used for that  
particular application.

Bharat