1. Setting up Ruby

visit

http://rvm.io

and install RVM through curl.
‘’'bash

$ \curl -sSL https://get.rvm.io | bash -s stable

‘''
Then, you enable bash_profile for later install.

$ source .bash_profile

We’re currently using Ruby 2.2.0 version, therefore

$ rvm install 2.2.0

2. Setting up Rails

Install rails 4.2.0 , with command (with out documentations, and two “-“s in front of no)
‘’’bash
gem install rails —no-ri —nordoc
‘''

3. Install PostgreSQL

brew install postgresql

To have launchd start postgresql at login:

ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents

Then to load postgresql now:

launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

Or, if you don't want/need launchctl, you can just run:

postgres -D /usr/local/var/postgres