My RubyGems ToolboxPresented by Nickolas Kenyeres

A gem is a valuable nugget of reusable code

A gem is easy to install

gem install sinatra

Many gems live on RubyGems.org

& They wait anxiously for you to download them

Gems install to your Ruby $LOADPATH

A gem just needs to be required

require sinatra

get '/hi' do "Hello World!" end

–Confucius

“Above all else, a gem wants to be depended on”

BUNDLER

Tell Bundler what you need

source 'https://rubygems.org'

gem 'sinatra', '~> 1.4.6' gem 'sqlite3'

Then tell Bundler what to do

bundle install

BUNDLER IS AN OPTIMIST

Bundler will give you version 2.0 if it exists Bundler knows no upper bound

gem 'sinatra', '>= 1.4’

BUNDLER IS A PESSIMIST

Bundler will give you less than version 2.02.0 is out of bounds

gem 'sinatra', '~> 1.4’

I AM A BIGGER PESSIMIST

Bundler will give you less than version 1.5.0 1.5.0 is out of bounds

gem 'sinatra', '~> 1.4.6’

Bundler works with Git

gem 'sinatra', git: https://github.com/sinatra/sinatra.git, branch: '2.2.0-alpha'

Bundler does Groups

gem 'rspec', group: [:development, :test]

group :production do gem 'unicorn' end

Ruby gems are often best in class

Documentation Test coverage

Semantic versioning Idiomatic

Configurable

SidekiqBackground jobs

https://github.com/mperham/sidekiq

RoadieInline styles in HTML email

https://github.com/Mange/roadie

CarrierwaveFile uploads made easy

https://github.com/carrierwaveuploader/carrierwave

Devise & Pundit Authentication & Authorization

https://github.com/plataformatec/devise

https://github.com/elabs/pundit

Nickolas Kenyeres | http://www.knicklabs.com