ankushagarwal/ruby tutorial.md

## ruby tutorial.md

      
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    Managing rubies and rvm on OSX

Get rid of rvm

Unistall rvm ( if there exists one )
rm -rf ~/.rvm

Fresh install rvm

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

Bash/Zsh profile


Add .rvm/bin to your path

export PATH=$HOME/.rvm/bin:$PATH


Load rvm as a function

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"


Make sure that the above two steps happen only once in your bash/zsh profile

Download rubies


rvm list known gives the list of known rubies
Install a particular ruby using rvm install <ruby-version>
Example :

rvm install ruby-2.1.1

Gems and Gemsets


Create gemsets for every fricking project.
Never install global gems
To create a gemset for version 2.1.1

rvm use ruby-2.1.1
rvm gemset create project_name


As simple as that

Using Gemsets


rvm gemset_name can be run to use a particular gemset

rvm ruby-2.1.1@gemset_name

Project ruby version and gemset management


Create a .ruby-version file in the root of the project. It should contain the ruby version being used for the project

echo "ruby-2.1.1" > .ruby-version


Create a .ruby-gemset file in the root of the project. This file should contain the name of the gemset used for this project. Typically it is the same as the project name.

echo "project_gemset" > .ruby-gemset

Alernative way of ruby-version and gemset management using .rvmrc


The following command can be run to create gemsets and the .rvmrc file
for projects

rvm ruby-2.1.1@my_project --create --rvmrc


Note : This is not compatible with other ruby version managers. Use this only if
you are planning to use rvmrc.

Bundler for managing project gems


Create a Gemfile in your project

source 'https://rubygems.org'
gem 'rails'


Use bundle to install the required gems

bundle install


This creates a Gemfile.lock which is a locked version of all gems and
their versions and dependencies.


Execute a gem in the bundler's environment using bundle exec


bundle exec rspec spec/models

Other stuff

Set default ruby

rvm use --default 2.1.1

Update rvm

rvm get stable

References


Unofficial rvm cheat sheet
rvm Homepage
Bundler Homepage