Installtion and Setup

Following the guide at: http://railsapps.github.io/installrubyonrails-ubuntu.html

with of course, our own tips and twists and insights

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

If you get message "GPG signature verification failed" then use following command

gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

To use RVM

source ~/.rvm/scripts/rvm

Create new gemset

rvm use 2.3.0@teddy --create

where 2.3.0 is ruby version and teddy is project name

Use existing gemset

rvm use 2.3.0@teddy

Display a list of gemsets

rvm gemset list <- also tells which gemset is active

gemsets for ruby-2.3.0 (found in /home/user/.rvm/gems/ruby-2.3.0)
   (default)
   global
=> myapp
   rails5.0

If you have more than one Ruby version installed, you can see all of the gemsets by typing

rvm gemset list_all

Install rails - most recent stable release

gem install rails

Install rails - specific version

gem install rails --version=3.2.18

Create new project

rails new <project_name>

install gems after new project

bundle install

which rails is version

which rails /home/user/.rvm/gems/ruby-2.3.0@myapp/bin/rails

Rails Console

rails console

To reloads the environment

2.3.0 :001 > reload!
Reloading...
 => true

Get a list of gems that are outdated

gem outdated

Update all stale gems

gem update