Ruby on Rails Yos Riady yosriady.com 

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goo.gl/waonpj 

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Today’s Agenda ● Intro to Ruby (40 minutes) ● Rails (120 minutes) ● QA (20 minutes) 

Introduction rubyonrails.org ruby-lang.org 

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Built On Rails 

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Ruby Language codecademy.com/en/tracks/ruby ● Variables ● Conditionals ● Loops + Iterators ● Blocks ● Data Structures ● Classes 

Installing Rails https://lite.nitrous.io 

Creating a New Rails Application rails new myapp cd myapp bundle install rails server 

MVC Architecture 

Building a Static Site rails generate controller Pages home Now try and visit ‘/pages/home’. What do you see? 

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Building a Static Site Try adding a few more pages on your own. Remember, for each page: ● Add a new route in routes.rb ● Add a new action in PagesController.rb ● Add a view .erb file 

Building a Static Site Try adding the following in your action: def home @now = Time.now end In your home.html.erb file, add: <%= @now %> 

Building a Dynamic Site At the core, most database driven web sites are the same. They need to store records and provide a way to do the following: ● Create new records in the database ● Read or show the records in the database ● Update existing records ● Destroy or delete records Because these 4 actions are so common, Rails includes the scaffold command to make creating them easier. rails generate scaffold Confession title:string body:text 

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REST 

Let’s add comments to our application! Users can create Comments for a Confession, and have it visible under the Confession entry. How do we do this? Building a Dynamic Site 

What do we need? ● A new Comment model ● A new controller for Comments ○ A ‘create’ action to save new Comments to the DB ● A new route in routes.rb for ‘comments#create’ ● A view form for users to write a Comment Building a Dynamic Site 

Building a Dynamic Site 

Hands-On 

Learning Resources ● http://tryruby.org/ ● http://guides.rubyonrails.org/ ● http://docs.railsbridge.org/intro-to-rails/ ● http://rails-4-0.railstutorial.org ● http://www.codecademy.com/learn/learn-rails 

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Q&A Yos Riady yosriady.com 

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