Hands On Ruby on Rails

Building Your First App

Chris Kemp, salesforce.com, Sr. Solution Engineer

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Session Agenda

• Introduction to Ruby, Rails, and Heroku (10 min)

• Getting Started (5 min)

• Building a Blogging App (25 min)

• Deploying to Heroku (10 min)

• Q&A (10 min)

What is Ruby?

• Created by Yukihiro "Matz" Matsumoto, released in 1995

• Open source, object-oriented programming language

• Sparse but expressive syntax

• Runs on every platform

• Garbage-collected

• Dynamic type checking

• No compiler

Ruby Sample:

posts.each do |post|

unless post.done?

editor.review post

else

post.submit

end

end

In Apex:

for (Post current : posts) {

if (!post.isDone()) {

editor.review(current);

} else {

post.submit();

}

}

Ruby on Rails

• Web-app development framework for Ruby

• Convention over configuration

• Model-View-Controller pattern

• DRY (don’t repeat yourself)

• RESTful

• Testing should be baked in

Rails Directory Structure Conventions

…

app/

controllers/

helpers/

mailers/

models/

views/

config/

db/

…

What is Heroku and why should I use it?

• Salesforce’s Platform as a Service

• Forget Servers

• Run Anything

• See Everything

• Scale Rapidly

• Integrate to Salesforce with

databasedotcom gem

Getting Started with Heroku

• Install Heroku Toolbelt (CLI, Foreman, Git)

• Install Ruby 1.9.2

• Install Rails

• Install PostgreSQL

• Use RVM, Homebrew, RubyGems

http://bit.ly/LN9nvK

Creating a Ruby on Rails app

• Create a new Rails app

$ rails new blog

Dependency Management with Ruby

• Use SQLite for testing, Postrgres for Production by changing

the gem "sqlite3" line in Gemfile

• Update Bundle

$ bundle install

Creating our Data Model & Scaffolding

• Create scaffolding for Posts

$ rails generate scaffold Post

title:string body:text

• Let’s look at some code!

Changing the Landing Page

• Remove the static landing page

$ rm public/index.html

• Add a route for the landing page (in config/routes.rb)

root :to => "posts#index"

Testing our App Locally

• Create the database

$ rake db:create

• Run migrations

$ rake db:migrate

• Start the app

$ rails server

• Enter a new post

Deploying to Heroku

• Create a new Git repo

$ git init

• Create a new Heroku app

$ heroku create

• Commit to repo & deploy

$ git push heroku master

• Run migrations on Heroku Postgres DB

$ heroku run rake db:migrate

Developer Resources

• Dev Center: https://devcenter.heroku.com/

• Getting Started with Ruby: https://devcenter.heroku.com/articles/ruby

• Getting Started with Rails 3.x: https://devcenter.heroku.com/articles/rails3

• GitHub repo with today’s Blog example:

https://github.com/sfckemp/sf13-blog-example

Coming Soon…

Expected Publishing Date is February 15, 2013.