Timothy N. Tsvetkov, Rails 3.1

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Rails 3.1
2 years of development
1234 commits
321 Contributors
243244 coffee caps
1 dhh

Delivering Developers
Happiness

HTTP Streaming
Make your’s applications even faster

Browser start
processing CSS and JS
before you request DB

Yes, all DB requests
actually in view

Yes, all DB requests
actually in view
But, who care?

listen 3000, :tcp_nopush => false

class PostsController
stream

stream :only => :index

def index
@posts = Post.cool_posts.all

end

def index
@posts = Post.cool_posts.all
render :stream => true
end

<!DOCTYPE html>
<html>
<head>
<title><%= yield :title %></title>
...
...
</head>
<body>

<% content_for :title, "Projects" %>

<%= yield :title %>


<%= yield :title %>

@posts = Post.cool_posts


<%= yield :title %>

@posts = Post.cool_posts

<% provide :title, "Projects" %>

Middlewares that need
to manipulate the body

ActiveRecord
Identity Map
by Emilio Tagua

user1 = User.find(1)
user2 = User.find(1)

user1 == user2 # => true
user1.object_id == user2.object_id # => true

config.active_record.identity_map = true

Does not track
associations :(

Post.has_many :comments, :dependent => :destroy

comment = @post.comments.first
comment.post = nil
comment.save

Post.destroy(@post.id)

Post.has_many :comments, :dependent => :destroy

comment = @post.comments.first
comment.post = nil
comment.save

Post.destroy(@post.id)

comment will be
destroyed

SELECT * FROM users WHERE id = 42;

SELECT * FROM users WHERE id = ?;

Works Prefect
• SQLite
• Postgres
Complicated
• MySQL

Role-based
mass-assignment
protection

class Post < ActiveRecord::Base
attr_accessible :title
attr_accessible :title, :user_id, :as => :admin
end

class Post < ActiveRecord::Base
attr_accessible :title
attr_accessible :title, :user_id, :as => :admin
end

Post.update_attributes(params[:post], :as => :admin)

class Filter < Struct.new(:klass)
def call(*args); end
end

module CategoryFilter
def call(category, *args)
klass.where(:category => args.shift)
super(*args)
end
end

class User < ActiveRecord::Base
scope :combined, Filter.new(self).extend(NameFilter)
end

RJS has been extracted
out to a gem

authenticity_token
custom handling or to omit the token

AR options hash

:conditions, :include, :joins,
:limit, :offset, :order,
:select, :readonly, :group,
:having, :from, :lock

green_items = Item.scoped_by_colour('orange')

Timothy N. Tsvetkov, Rails 3.1

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