Installing rails 3.1 and ruby 1.9.2-p180 using rvm and unicorn setup

Install rvm

Open your .bashrc file.
And replace the following line
[ -z “$PS1” ] && return
with
if [[ -n “$PS1” ]]; then
Now add this to the last line of the file
if [[ -s $HOME/.rvm/scripts/rvm ]] ; then source $HOME/.rvm/scripts/rvm ; fi

fi
This loads RVM into a shell session.

If already have rvm then
Update rvm

if this shows error like ‘downloaded does not match it’s md5 checksum’

then run

For ruby 1.9.2 we want the packages it lists under the MRI & ree section. Let’s install those now.

Setting up Ruby

Do rvm list known to know all ‘Ruby implementation made available through RVM’

Then install latest stable release of ruby

You can see the ruby versions installed and currently using ruby version by

To list default ruby

You can change it by

for default : rvm –default 1.9.2-p180

Using Gemsets

Install rails stable release and then rails 3.1
Start by creating our gemsets

See available gem sets by

If any confusion with rails31 gemset delete it

And create rails31rc

As a best practice, remember to always use one gemset per project*.

Installing Rails

Now we have multiple gem set installed. Now set the different gem set for ruby versions.

Install Rails 3.0.7

Select the gemset for Rails 3.1

for default $ rvm use 1.9.2-p180@rails31rc –default

Install Rails 3.1

if not found

rvmrc file

Switching from one project to another, from a client to a personal project, from testing the release candidate to developing using the latest stable version, always having to manually switch from using a gemset to another can impact productivity. The project .rvmrc files can increase the development speed by setting up our project’s ruby environment when we switch to the project root directory.

The rule of thumb here is to use a .rvmrc file for each project, for both development and deployment.*

.rvmrc file :

if you go to your app folder ‘$ cd myapp’ then you can see like

There are three types of .rvmrc files
1) system : on /etc/rvmrc
2) user : $HOME/.rvmrc
3) Project : .rvmrc

Create a new rails App

with mysql as database

If u get error like

“”” home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/execjs-1.1.2/lib/
execjs/runtimes.rb:43:in `autodetect’: Could not find a JavaScript
runtime. See https://github.com/sstephenson/execjs for a list of
available runtimes. (ExecJS::RuntimeUnavailable) “””

Then you need a javascript engine to run your code…

try installing rubyracer (Embeds the V8 Javascript interpreter into Ruby.)

in your Gemfile add

gem ‘therubyracer’
and do bundle install

Unicorn Installation

Start unicorn server

Author: Abhilash

Hi, I’m Abhilash! A seasoned web developer with 15 years of experience specializing in Ruby and Ruby on Rails. Since 2010, I’ve built scalable, robust web applications and worked with frameworks like Angular, Sinatra, Laravel, Node.js, Vue and React. Passionate about clean, maintainable code and continuous learning, I share insights, tutorials, and experiences here. Let’s explore the ever-evolving world of web development together! View all posts by Abhilash