Rail to the Ruby and Rails world

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Ruby

1995 v0.95 History of Ruby 2003 v1.8 2007 v1.9 2013 Feb. v2.0 2013 Dec. v2.1 2014 v2.2 Ruby is intensively developed over 20 years

$ cat hello.rb class Hello def initialize(name) @name = name end def say puts "Hello, #{@name}!" end end hello = Hello.new("David") hello.say $ ruby hello.rb #=> Hello, David! class declaration→ method declaration→ Instantiation→ Method call→ Basic Ruby Syntax instance variable→

3 Must-Know Tools for Ruby developing rbenv RubyGems bundler

rbenv # install ruby 2.1.5 $ rbenv install 2.1.5 $ rbenv shell 2.1.5 $ ruby -v ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux] # install ruby 2.2.2 $ rbenv install 2.2.2 $ rbenv shell 2.2.2 $ ruby -v ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux] Simple Ruby Version Management Tool There are similar tools for other languages: plenv phpenv pyenv…

RubyGems is a standard package manager for the Ruby Anyone can make own gem and publish it to https://rubygems.org RubyGems # install gem $ gem install nokogiri $ irb > require ‘nokogiri’ > doc = Nokogiri::HTML.parse('') > doc.search('.hello').text => "world" * irb is Interactive Ruby. REPL for Ruby. Similar to PEAR for PHP, CPAN for Perl, pip for Python, npm for Node.js etc

Managing the gems that the application depends on Bundler $ cat Gemfile source ‘https://rubygems.org' gem ‘nokogiri’ gem ‘rails’ $ bundle #=> Install all gems listed in Gemfile Bundler makes sure Ruby applications run the same code on every machine by installing given list of gems and its depending gems Similar to composer for PHP, carton for Perl, CocoaPods for iOS, etc

So, Let’s begin to talk about Rails

Ruby on Rails

Ruby on Rails is a web application framework based on MVC pattern

Rails builds up with multiple sub frameworks

Model - ActiveRecord - O/R Mapper View - ActionView - View Template Handler Controller - ActionPack - Request/Response Handler Most important frameworks

ActiveSupport - Utilities and Ruby Extensions ActiveJob - Asynchronous Job Queue ActionMailer - Email Delivering And other useful frameworks

Demo Making simple Rails application from scratch

Useful Gems

Haml is a template language that provides more simple and clean syntax for markup Haml

<%= post.title %>

<%= post.subtitle %>

%section.container %h1= post.title %h2= post.subtitle .content = post.content

You can build a complex form with less code than default form builder Simple Form <%= form_for @user do |f| %> <% end %> <%= simple_form_for @user do |f| %> <%= f.input :name %> <%= f.input :email %> <%= f.input :birthday %> <%= f.button :submit %> <% end %>

Use Ruby REPL everywhere Web Console

carrierwave - Flexible Image Uploader kaminari - De facto paginator for Rails omniauth - Standardizes multi provider authentication redcarpet - Markdown parser and renderer Other useful gems

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Rails Guides - Official guide of rails http://guides.rubyonrails.org/ Rails Girls Guides - Rails guide for beginner programmer http://guides.railsgirls.com/ Rails Tutorial https://www.railstutorial.org/book Rails API References http://api.rubyonrails.org/ Good documents to learn Rails