upgrade to rails 4 and ruby 2

To upgrade your rails version to rails 4 is pretty easy just follow the below steps.

- I assume you have already rails installed in your system and also you are using rvm and ruby.
- If you are not using rvm i recomend you to use rvm. please check the link for rvm (http://rvm.io/)

open a terminal and follow the steps.

Step 1:
 rvm get head (to get the latest version of rvm)

Step 2:
 rvm install 2.0.0 (to install ruby)

Step 3:
 rvm use 2.0.0

Step 4:
 rvm gemset create rails4

Step 5:
 gem install rails

That's it to upgrade your rails version to rails 4 and ruby 2 in ubantu 12.04. Now if you run rails new new_app it will automatically create your rails application in rails 4 simple :)

Further if you want to use both rails 3 and and rails 4 you can create a .rvmrc file in your application and mention the gem set in that file.

echo "rvm ruby-1.8.7-p352@gemset" > .rvmrc

And inside the file mentioned your gem set. like

rvm use 2.0.0
rvm gemset use rails4


  1. Nice blog Sabyasachi.. It saved my time a lot.

  2. It takes a lot time to run gem install rails, why is this so?

  3. @debadatta it will take some time as it will pull and install all the default gems with rails 4.

  4. Thanks for sharing. If you are looking for ROR developers in India, then Cryptex Technologies is the right company for you. If you need any help from us email at: info@cryptextechnologies.com


Post a Comment

Popular posts from this blog

Insert Bulk data using active record import

How to add a bootstrap table with fixed header and scrollable body