RUBY ON RAILS UP AND RUNNING 

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WHY RUBY ON RAILS? 

RUBY (IT’S THE LANGUAGE BEHIND RAILS) ELEGANT SIMPLE INTUITIVE BEAUTIFUL 

RAILS (IT’S THE FRAMEWORK) CONVENTION OVER CONFIGURATION DON’T REPEAT YOURSELF PROGRAMMER HAPPINESS COMMUNITY 

RUBY + RAILS = — 

“Ruby on Rails is astounding. Using it is like watching a kung-fu movie, where a dozen bad-ass frameworks prepare to beat up the little newcomer only to be handed their asses in a variety of imaginative ways.” Nathan Torkington, O’Reilly Media 

MVC (It’s the pattern behind Rails) Model View Controller 

Model Generally, the nouns in your application responsible for behavior and data. posts, users, comments 

View Displays information passed to it to the end user. Can be HTML, JSON, XML ... 

Controller Directs or “controls” an applications flow. The glue that brings models and views together. 

Browser View Controller Model 

4 MAIN CONCEPTS 

id title body 1 a blog post part I lorem ipsum... 2 a blog post part II lorem ipsum... 3 a blog post part III lorem ipsum... Active Record Database tables map to Ruby objects and columns become instance variables with getter and setter methods. class Post < ActiveRecord::Base end @post = Post.find(1) puts @post.title a blog post part I posts table 

Action View Handles template rendering. Can use various template languages but Rails comes standard with ERB which is just Ruby mixed into HTML.

<% @posts.each do |post| %>
• <%= post.title %>
<% end %>

• a blog post part I • a blog post part II • a blog post part III posts.html.erb as seen in the browser 

Action Controller Made up of various actions that are executed upon a request. Responsible for responding or directing web requests through an application. Typically requests data from a model and responds with a view. class PostsController < ApplicationController def index @posts = Post.all end end Gets all posts and renders the posts/index.html.erb view. How does it know?! 

1 LAST MAIN CONCEPT BUT LET’S TALK ABOUT REST FIRST 

REST Convention for working with resources over HTTP. GET PUT POST DELETE GET /posts => Returns all posts, usually maps to an index action GET /posts/123, usually maps to a show action => Returns a post with the ID of 123 

Routes Connects URL paths to controller actions. Blog::Application.routes.draw do match "/posts" => "posts#index" resources :posts end 

Browser ActionView ActionController ActiveRecord Routes 

A FEW OTHER CONCEPTS 

Ruby Gem A packaged Ruby library or application. You can install Ruby Gems using the RubyGems CLI tool like or you may use... gem install rails 

Bundler Dependency management for your application’s Ruby Gems. source 'https://rubygems.org' gem 'rails', '3.2.3' 

Rake Command line tool to script common tasks. For instance, migrating the database or running an application’s test suite. rake db:migrate rake test:unit 

RVM Ruby Version Manager allows you to easily install, manage, and work with multiple ruby environments. Not necessary but very handy. 

Git Has nothing to do with Ruby per se, but it is the de facto tool used to keep track of code. Git is a distributed version control system. 

Rails Resources railscasts.com guides.rubyonrails.org railsforzombies.com peepcode.com rubygems.org ruby-toolbox.com 

NOW LET’S DO STUFF!