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Rails Kool-Aid鈩�
Giving you your very own
glass, drink up!
Saturday, November 20, 2010

Me llamo Ryan Abbott
Co-founder of Loudpixel Inc.
Developing web sites/apps for nearly 10
years #angel铿乺ecounts
Largest production Rails application is
Levee #itsawesome
Ten-ish other production apps
HI, WHO ARE YOU AGAIN?

WHO/WHAT IS RUBY ON RAILS?
Web Framework built on top of Ruby
Created by David Heinemeier Hansson
DHH released Rails as open source in July
of 2004 but was the sole contributor
Rails 1.0 was released on December 13,
2005
Rails 3.0 (current) was released on
August 29, 2010 - it has 1700+
contributors

WHY RAILS?
Rapid Application Development
Defaults - Scaffold, relationships,
nested objects, etc.
Plugins!
Deployment
Sites like Heroku provide free hosting,
and all you need is GIT
Community
1700+ contributors and tens of thousands
of live apps

LITTLE BIG WORDS
CRUD (Create, Read, Update, Delete)
The 4 basic functions performed on the
data that our application stores
MVC (Model-View-Controller)
The architecture pattern used by rails
DRY (Don鈥檛 Repeat Yourself)
Software development principle
emphasized within the rails community
REST (Representative State Transfer)
Using identi铿乪rs to represent resources

MODEL-VIEW-CONTROLLER
Models
Manages how the data is stored, and how
that data behaves
Views
Renders the models in a way best suited
for the requested format
Controllers
Receives instructions from users based
on actions, and informs the models how
they should respond and the views what
they should display

REST[ful] RESOURCES
RESTful URLs provide a human readable
set of resources, and their states.
An example could be
/users/15/edit
What do we expect here?
User
Id of 15
Edit view to be displayed

CREATING A RAILS PROJECT
> rails new blogpress
Creates a new directory called 鈥榖logpress鈥�
containing the following:
Gem铿乴e
Home to your GEM dependencies
app
This is where you鈥檒l 铿乶d your models,
views, and controllers
con铿乬
As you would imagine, here lives your
con铿乬urations; routes, etc.

DIRECTORY BREAKDOWN CON鈥橳
db
Contains your database schema and
migrations
log
Development, Test, and Production logs
public
Web accessible directory, images,
stylesheets, javascript, etc.
vendor
A centralized location for third-party
code from plugins to gem source

APPLICATION READY, NEXT?
> bundle install
Bundler is a tool that installs required
gems for your application. Bundler is
able to determine dependencies and
children without instructions from you
database con铿乬uration (database.yml)
Defaults to sqlite, allows for MySQL,
and PostgreSQL OOB, and others with
use of plugins
development, test, production

DATABASE CONFIGURED, SO...
> rake db:create
This will read the database.yml 铿乴e
and create the databases requested
rake, WTF?
Rake is a way to run tasks, the
majority of tasks you run are already
provided by Rails, but you can always
create your own
> rake -T
Display a list of all rake tasks
available

HELLO, WORLD? RAILS?
> rails server
Starts the rails server at port 3000 and
allows us to navigate our new site!
Check things out, in the browser view:
http://127.0.0.1:3000/

DATABASE CONFIGURED, SO...
> rm public/index.html
We don鈥檛 want this page displaying
when visitors come to our blog
> rails generate controller home index
Generate a controller with only an
index action to take the place of
public/index.html
Update con铿乬/routes.rb to let the app
know that our root should be
REMOVE get "home/index"
ADD root :to => 鈥渉ome#index鈥�

GOODBYE DEFAULT

WHAT MAKES UP A BLOG?

EVERY BLOG HAS POSTS
> rails generate scaffold Post
author:string title:string content:text
permalink:text
Scaffold creates full CRUD
functionality for us, including our
model, view, controller, and even our
database migration
rake db:migrate
Calls our self.up method to create the
posts database table

OH POSTS, WHERE ART THOU?
In the browser, lets have a look at:
http://127.0.0.1:3000/posts

WHAT鈥橲 MISSING?
Posts
Comments (haters gone hate)
Tags / Keywords (I鈥檓 here for ONE thing)
Validation (plan for the spoon in the knife drawer)
Overall Blog
Authentication (hackers gone hack)
Most Recent Posts (laziness is contagious)

COMMENTS
> rails generate scaffold Comment
post:references email:string
content:text
> rake db:migrate
con铿乬/routes.rb
1307656, 1307661

ROUTING FOR COMMENTS
/comments
/comments/1
/comments/1/edit
/posts
/posts/1
/posts/1/edit
/posts/1/comments
/posts/1/comments/1
/posts/1/comments/edit
/comments?post_id=1
/comments/1?post_id=1
/comments/1/edit?post_id=1
@post = Post.
铿乶d(params[:post_id])
@comments = @post.comments
1307656, 1307661

COMMENTS
<h2>Comments</h2>
<% @post.comments.each do |comment| %>
<p>
<b><%= comment.email %></b>
<%= comment.content %>
</p>
<% end %>
<h2>Add a comment:</h2>
<%= form_for([@post, @post.comments.build]) do |f| %>
<% if @comment && @comment.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@comment.errors.count, "error") %> prohibited this comment from being saved:</h2>
<ul>
<% @comment.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="铿乪ld">
<%= f.label :email %><br />
<%= f.text_铿乪ld :email %>
</div>
<div class="铿乪ld">
<%= f.label :content %><br />
<%= f.text_area :content %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
app/views/posts/show.html.erb
@post = Post.铿乶d(params[:post_id])
@comment = @post.comments.new(params[:comment])
respond_to do |format|
if @comment.save
format.html { redirect_to(post_path(@post), :notice => 'Comment was successfully
created.') }
format.xml { render :xml => @post, :status => :created, :location => post_path(@post) }
else
format.html { redirect_to post_path(@post) }
format.xml { render :xml => @comment.errors, :status => :unprocessable_entity }
end
end
app/views/controllers/comments_controller.rb
has_many :comments
app/models/post.rb

SHOWING COMMENTS
1307643

ACCEPTING COMMENTS
1314025

BRING ON THE SPAM!

TAGS / KEYWORDS
gem 'acts-as-taggable-on'
> bundle install
> rails generate acts_as_taggable_on:migration
> rake db:migrate
acts_as_taggable
1307777

VALIDATION OPTIONS
:presence => true
:uniqueness => true
:numericality => true
:length => { :minimum => 0, maximum => 2000 }
:format => { :with => /.*/ }
:inclusion => { :in => [1,2,3] }
:exclusion => { :in => [1,2,3] }
:acceptance => true
:con铿乺mation => true

VALIDATION
Comment Validation
Post Validation
1307783, 1307789

AUTHENTICATION
Basic HTTP authentication prompts users
via a browser popup. This authentication
lasts until the browser is closed.
1307757

MOST RECENT POSTS
1309253
We want to display the top n posts on the main page,
of course we鈥檒l want the n more recent posts

JOBS, GIGS, CAREERS
http://jobs.37signals.com/
http://toprubyjobs.com/
http://jobs.rubynow.com/
http://www.railsjob.com/
http://railswork.com/
http://weblog.rubyonrails.org/jobs
http://www.rorjobs.com/
http://www.railslodge.com/jobs
http://ruby.jobmotel.com/

HOSTING, DEPLOYMENT
http://heroku.com/
http://engineyard.com/
http://www.webbynode.com/
http://www.rubyenterpriseedition.com/
https://github.com/

ONLINE RESOURCES?
http://tryruby.org/
A 15 minute, in-browser, tutorial showing you the
basics of Ruby
http://railsforzombies.org/
Online interactive tutorials that teach you rails
right in the browser
http://rubyonrails.org/screencasts/rails3
A set of beautiful screencasts by Gregg Pollack that
walk viewers though the details of the Rails core
pieces
http://railscasts.com/
Extremely helpful videos from Ryan Bates - started
back in 2007 Ryan is always on top of new plugins
and methods of doing things

Ryan Abbott
@MSURabbott
ryan@loudpixel.com

Ryan Abbott
@MSURabbott
ryan@loudpixel.com
http://spkr8.com/t/5139
http://slidesha.re/b09DCa

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