Slide 1
Slide 1 text
10 Things You Didn’t Know
Rails Could Do
Slide 2
Slide 2 text
James Edward Gray II
I am a regular on the
Ruby Rogues podcast
I have been a Rubyist
for eight years now
I have written a lot of
documentation and
code for Ruby,
including CSV
Slide 3
Slide 3 text
10 Things You Didn’t Know
Rails Could Do
Slide 4
Slide 4 text
10 Things You Didn’t Know
Rails Could Do
4.2⨉ more awesome!
42
Slide 5
Slide 5 text
Rails 3.2.3 Can…
Slide 6
Slide 6 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 7
Slide 7 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 8
Slide 8 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 9
Slide 9 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 10
Slide 10 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 11
Slide 11 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 12
Slide 12 text
Get You a Hug, Every Friday
1
http://hugfriday.com/
Slide 13
Slide 13 text
Interfaces
Ways to give Rails a hug
Slide 14
Slide 14 text
Run From a Single File
From Avdi Grimm
2
Slide 15
Slide 15 text
Run From a Single File
From Avdi Grimm
2
Slide 16
Slide 16 text
Run From a Single File
From Avdi Grimm
2
Slide 17
Slide 17 text
Run From a Single File
From Avdi Grimm
2
Slide 18
Slide 18 text
Run From a Single File
From Avdi Grimm
2
Slide 19
Slide 19 text
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
Slide 20
Slide 20 text
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
Slide 21
Slide 21 text
<%# OPTIMIZE: Paginate this listing. %>
<%= render Article.all %>
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
Slide 22
Slide 22 text
$ rake notes
app/controllers/users_controller.rb:
* [ 2] [TODO] Make it possible to create new
users.
app/models/user.rb:
* [ 2] [FIXME] Should token really be
accessible?
app/views/articles/index.html.erb:
* [ 1] [OPTIMIZE] Paginate this listing.
<%# OPTIMIZE: Paginate this listing. %>
<%= render Article.all %>
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
Slide 23
Slide 23 text
$ rake notes
app/controllers/users_controller.rb:
* [ 2] [TODO] Make it possible to create new
users.
app/models/user.rb:
* [ 2] [FIXME] Should token really be
accessible?
app/views/articles/index.html.erb:
* [ 1] [OPTIMIZE] Paginate this listing.
<%# OPTIMIZE: Paginate this listing. %>
<%= render Article.all %>
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
Slide 24
Slide 24 text
<%# OPTIMIZE: Paginate this listing. %>
<%= render Article.all %>
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
$ rake notes:todo
app/controllers/users_controller.rb:
* [ 2] Make it possible to create new users.
$ rake notes:fixme
app/models/user.rb:
* [ 2] Should token really be accessible?
Slide 25
Slide 25 text
<%# OPTIMIZE: Paginate this listing. %>
<%= render Article.all %>
Remind You of Things
3
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bio, :email, :name, :token
end
$ rake notes:todo
app/controllers/users_controller.rb:
* [ 2] Make it possible to create new users.
$ rake notes:fixme
app/models/user.rb:
* [ 2] Should token really be accessible?
Slide 26
Slide 26 text
Remind You of Things
3
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
# JEG2: Add that code from your blog here.
end
$ rake notes:custom ANNOTATION=JEG2
app/models/article.rb:
* [ 4] Add that Code from your blog here.
Slide 27
Slide 27 text
Remind You of Things
3
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
# JEG2: Add that code from your blog here.
end
$ rake notes:custom ANNOTATION=JEG2
app/models/article.rb:
* [ 4] Add that Code from your blog here.
Slide 28
Slide 28 text
Remind You of Things
3
Slide 29
Slide 29 text
Sandbox Your Console
4
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
$ rails c --sandbox
Loading development environment in sandbox (Rails 3.2.3)
Any modifications you make will be rolled back on exit
>> jeg2 = User.create!(name: "James Edward Gray II")
=> #
>> article = Article.new(subject: "First Post").tap { |a|
a.user = jeg2; a.save! }
=> #
>> Comment.new(body: "I need to add this.").tap { |c|
c.user, c.article = jeg2, article; c.save! }
=> #
>> [Article, Comment, User].map(&:count)
=> [1, 1, 1]
>> exit
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
Slide 30
Slide 30 text
Sandbox Your Console
4
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
$ rails c --sandbox
Loading development environment in sandbox (Rails 3.2.3)
Any modifications you make will be rolled back on exit
>> jeg2 = User.create!(name: "James Edward Gray II")
=> #
>> article = Article.new(subject: "First Post").tap { |a|
a.user = jeg2; a.save! }
=> #
>> Comment.new(body: "I need to add this.").tap { |c|
c.user, c.article = jeg2, article; c.save! }
=> #
>> [Article, Comment, User].map(&:count)
=> [1, 1, 1]
>> exit
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
Slide 31
Slide 31 text
Sandbox Your Console
4
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
$ rails c --sandbox
Loading development environment in sandbox (Rails 3.2.3)
Any modifications you make will be rolled back on exit
>> jeg2 = User.create!(name: "James Edward Gray II")
=> #
>> article = Article.new(subject: "First Post").tap { |a|
a.user = jeg2; a.save! }
=> #
>> Comment.new(body: "I need to add this.").tap { |c|
c.user, c.article = jeg2, article; c.save! }
=> #
>> [Article, Comment, User].map(&:count)
=> [1, 1, 1]
>> exit
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
Slide 32
Slide 32 text
Sandbox Your Console
4
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
$ rails c --sandbox
Loading development environment in sandbox (Rails 3.2.3)
Any modifications you make will be rolled back on exit
>> jeg2 = User.create!(name: "James Edward Gray II")
=> #
>> article = Article.new(subject: "First Post").tap { |a|
a.user = jeg2; a.save! }
=> #
>> Comment.new(body: "I need to add this.").tap { |c|
c.user, c.article = jeg2, article; c.save! }
=> #
>> [Article, Comment, User].map(&:count)
=> [1, 1, 1]
>> exit
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
Slide 33
Slide 33 text
Sandbox Your Console
4
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
$ rails c --sandbox
Loading development environment in sandbox (Rails 3.2.3)
Any modifications you make will be rolled back on exit
>> jeg2 = User.create!(name: "James Edward Gray II")
=> #
>> article = Article.new(subject: "First Post").tap { |a|
a.user = jeg2; a.save! }
=> #
>> Comment.new(body: "I need to add this.").tap { |c|
c.user, c.article = jeg2, article; c.save! }
=> #
>> [Article, Comment, User].map(&:count)
=> [1, 1, 1]
>> exit
$ rails r 'p [Article, Comment, User].map(&:count)'
[0, 0, 0]
Slide 34
Slide 34 text
Run Helper Methods
in the Console
5
$ rails c
Loading development environment (Rails 3.2.3)
>> helper.number_to_currency(100)
=> "$100.00"
>> helper.time_ago_in_words(3.days.ago)
=> "3 days"
Slide 35
Slide 35 text
Run Helper Methods
in the Console
5
$ rails c
Loading development environment (Rails 3.2.3)
>> helper.number_to_currency(100)
=> "$100.00"
>> helper.time_ago_in_words(3.days.ago)
=> "3 days"
Slide 36
Slide 36 text
Use Non-WEBrick Servers
in Development
6
source 'https://rubygems.org'
# ...
group :development do
gem "thin"
end
$ rails s thin
=> Booting Thin
=> Rails 3.2.3 application starting in development
on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
>> Thin web server (v1.3.1 codename Triple
Espresso)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop
Slide 37
Slide 37 text
Use Non-WEBrick Servers
in Development
6
source 'https://rubygems.org'
# ...
group :development do
gem "thin"
end
$ rails s thin
=> Booting Thin
=> Rails 3.2.3 application starting in development
on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
>> Thin web server (v1.3.1 codename Triple
Espresso)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop
Slide 38
Slide 38 text
Allow You to Tap Into
its Configuration
From Josh Susser
7
# lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
Slide 39
Slide 39 text
Allow You to Tap Into
its Configuration
From Josh Susser
7
# lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
Slide 40
Slide 40 text
Allow You to Tap Into
its Configuration
From Josh Susser
7
# lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
# config/application.rb
# ...
require_relative "../lib/custom/railtie"
module Blog
class Application < Rails::Application
# ...
config.custom.setting = 42
end
end
Slide 41
Slide 41 text
Allow You to Tap Into
its Configuration
From Josh Susser
7
# lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
# config/application.rb
# ...
require_relative "../lib/custom/railtie"
module Blog
class Application < Rails::Application
# ...
config.custom.setting = 42
end
end
Slide 42
Slide 42 text
Allow You to Tap Into
its Configuration
From Josh Susser
7
# lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
# config/application.rb
# ...
require_relative "../lib/custom/railtie"
module Blog
class Application < Rails::Application
# ...
config.custom.setting = 42
end
end
Slide 43
Slide 43 text
Keep You Entertained
8
Slide 44
Slide 44 text
Keep You Entertained
8
Slide 45
Slide 45 text
The Database
A place to store all that drama
Slide 46
Slide 46 text
Understand Shorthand
Migrations
$ rails g resource user name:string email:string token:string bio:text
9
From José Valim
Slide 47
Slide 47 text
Understand Shorthand
Migrations
$ rails g resource user name:string email:string token:string bio:text
$ rails g resource user name email token:string{6} bio:text
9
From José Valim
Slide 48
Slide 48 text
Understand Shorthand
Migrations
$ rails g resource user name:string email:string token:string bio:text
$ rails g resource user name email token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
end
end
9
From José Valim
Slide 49
Slide 49 text
Understand Shorthand
Migrations
$ rails g resource user name:string email:string token:string bio:text
$ rails g resource user name email token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
end
end
9
From José Valim
Slide 50
Slide 50 text
Understand Shorthand
Migrations
$ rails g resource user name:string email:string token:string bio:text
$ rails g resource user name email token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
end
end
9
From José Valim
Slide 51
Slide 51 text
Add Indexes to Migrations
$ rails g resource user name:index email:uniq token:string{6} bio:text
10
From José Valim
Slide 52
Slide 52 text
Add Indexes to Migrations
$ rails g resource user name:index email:uniq token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
add_index :users, :name
add_index :users, :email, :unique => true
end
end
10
From José Valim
Slide 53
Slide 53 text
Add Indexes to Migrations
$ rails g resource user name:index email:uniq token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
add_index :users, :name
add_index :users, :email, :unique => true
end
end
10
From José Valim
Slide 54
Slide 54 text
Add Indexes to Migrations
$ rails g resource user name:index email:uniq token:string{6} bio:text
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :token, :limit => 6
t.text :bio
t.timestamps
end
add_index :users, :name
add_index :users, :email, :unique => true
end
end
10
From José Valim
Slide 55
Slide 55 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
11
From José Valim
Slide 56
Slide 56 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
11
From José Valim
Slide 57
Slide 57 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
11
From José Valim
Slide 58
Slide 58 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
11
From José Valim
Slide 59
Slide 59 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
11
From José Valim
Slide 60
Slide 60 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
$ rails g resource comment user:belongs_to article:belongs_to body:text
11
From José Valim
Slide 61
Slide 61 text
Add Associations
to a Migration
$ rails g resource article user:references subject body:text
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
$ rails g resource comment user:belongs_to article:belongs_to body:text
11
From José Valim
Slide 62
Slide 62 text
Show You the Status
of the Database
$ rake db:migrate:status
database: db/development.sqlite3
Status Migration ID Migration Name
--------------------------------------------------
up 20120414155612 Create users
up 20120414160528 Create articles
down 20120414161355 Create comments
12
Slide 63
Slide 63 text
Show You the Status
of the Database
$ rake db:migrate:status
database: db/development.sqlite3
Status Migration ID Migration Name
--------------------------------------------------
up 20120414155612 Create users
up 20120414160528 Create articles
down 20120414161355 Create comments
12
Slide 64
Slide 64 text
Import Your CSV Data
13
Name,Email
James,[email protected]
Dana,[email protected]
Summer,[email protected]
require "csv"
namespace :users do
desc "Import users from a CSV file"
task :import => :environment do
path = ENV.fetch("CSV_FILE") {
File.join(File.dirname(__FILE__), *%w[.. .. db data users.csv])
}
CSV.foreach(path, headers: true, header_converters: :symbol) do |row|
User.create(row.to_hash)
end
end
end
Slide 65
Slide 65 text
Import Your CSV Data
13
Name,Email
James,[email protected]
Dana,[email protected]
Summer,[email protected]
require "csv"
namespace :users do
desc "Import users from a CSV file"
task :import => :environment do
path = ENV.fetch("CSV_FILE") {
File.join(File.dirname(__FILE__), *%w[.. .. db data users.csv])
}
CSV.foreach(path, headers: true, header_converters: :symbol) do |row|
User.create(row.to_hash)
end
end
end
Slide 66
Slide 66 text
Import Your CSV Data
13
Name,Email
James,[email protected]
Dana,[email protected]
Summer,[email protected]
require "csv"
namespace :users do
desc "Import users from a CSV file"
task :import => :environment do
path = ENV.fetch("CSV_FILE") {
File.join(File.dirname(__FILE__), *%w[.. .. db data users.csv])
}
CSV.foreach(path, headers: true, header_converters: :symbol) do |row|
User.create(row.to_hash)
end
end
end
Slide 67
Slide 67 text
Store CSV in Your Database
14
class Article < ActiveRecord::Base
require "csv"
module CSVSerializer
module_function
def load(field) field.to_s.parse_csv end
def dump(object) Array(object).to_csv end
end
serialize :categories, CSVSerializer
# ...
attr_accessible :body, :subject, :categories
end
Slide 68
Slide 68 text
Store CSV in Your Database
14
class Article < ActiveRecord::Base
require "csv"
module CSVSerializer
module_function
def load(field) field.to_s.parse_csv end
def dump(object) Array(object).to_csv end
end
serialize :categories, CSVSerializer
# ...
attr_accessible :body, :subject, :categories
end
Slide 69
Slide 69 text
Store CSV in Your Database
14
class Article < ActiveRecord::Base
require "csv"
module CSVSerializer
module_function
def load(field) field.to_s.parse_csv end
def dump(object) Array(object).to_csv end
end
serialize :categories, CSVSerializer
# ...
attr_accessible :body, :subject, :categories
end
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "JEG2's Rails Hacks",
categories: ["Rails", "Gray, James", "hacks"])
=> #
>> Article.last.categories
=> ["Rails", "Gray, James", "hacks"]
>> exit
$ sqlite3 db/development.sqlite3 'SELECT categories
FROM articles ORDER BY created_at DESC LIMIT 1'
-- Loading resources from /Users/james/.sqliterc
categories
--------------------------
Rails,"Gray, James",hacks
Slide 70
Slide 70 text
Store CSV in Your Database
14
class Article < ActiveRecord::Base
require "csv"
module CSVSerializer
module_function
def load(field) field.to_s.parse_csv end
def dump(object) Array(object).to_csv end
end
serialize :categories, CSVSerializer
# ...
attr_accessible :body, :subject, :categories
end
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "JEG2's Rails Hacks",
categories: ["Rails", "Gray, James", "hacks"])
=> #
>> Article.last.categories
=> ["Rails", "Gray, James", "hacks"]
>> exit
$ sqlite3 db/development.sqlite3 'SELECT categories
FROM articles ORDER BY created_at DESC LIMIT 1'
-- Loading resources from /Users/james/.sqliterc
categories
--------------------------
Rails,"Gray, James",hacks
Slide 71
Slide 71 text
Store CSV in Your Database
14
class Article < ActiveRecord::Base
require "csv"
module CSVSerializer
module_function
def load(field) field.to_s.parse_csv end
def dump(object) Array(object).to_csv end
end
serialize :categories, CSVSerializer
# ...
attr_accessible :body, :subject, :categories
end
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "JEG2's Rails Hacks",
categories: ["Rails", "Gray, James", "hacks"])
=> #
>> Article.last.categories
=> ["Rails", "Gray, James", "hacks"]
>> exit
$ sqlite3 db/development.sqlite3 'SELECT categories
FROM articles ORDER BY created_at DESC LIMIT 1'
-- Loading resources from /Users/james/.sqliterc
categories
--------------------------
Rails,"Gray, James",hacks
Slide 72
Slide 72 text
“Pluck” Fields Out of
Your Database
15
From Ryan Bates
$ rails c
Loading development environment (Rails 3.2.3)
>> User.select(:email).map(&:email)
User Load (0.1ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.pluck(:email)
(0.2ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.uniq.pluck(:email)
(0.2ms) SELECT DISTINCT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
Slide 73
Slide 73 text
“Pluck” Fields Out of
Your Database
15
From Ryan Bates
$ rails c
Loading development environment (Rails 3.2.3)
>> User.select(:email).map(&:email)
User Load (0.1ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.pluck(:email)
(0.2ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.uniq.pluck(:email)
(0.2ms) SELECT DISTINCT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
Slide 74
Slide 74 text
“Pluck” Fields Out of
Your Database
15
From Ryan Bates
$ rails c
Loading development environment (Rails 3.2.3)
>> User.select(:email).map(&:email)
User Load (0.1ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.pluck(:email)
(0.2ms) SELECT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
>> User.uniq.pluck(:email)
(0.2ms) SELECT DISTINCT email FROM "users"
=> ["[email protected]", "[email protected]", "[email protected]"]
Slide 75
Slide 75 text
Count Records in Groups
16
$ rails g resource event article:belongs_to trigger
Slide 76
Slide 76 text
Count Records in Groups
16
$ rails g resource event article:belongs_to trigger
$ rails c
Loading development environment (Rails 3.2.3)
>> article = Article.last
=> #
>> {edit: 3, view: 10}.each do |trigger, count|
?> count.times do
?> Event.new(trigger: trigger).tap { |e|
e.article = article; e.save! }
>> end
>> end
=> {:edit=>3, :view=>10}
>> Event.count
=> 13
>> Event.group(:trigger).count
=> {"edit"=>3, "view"=>10}
Slide 77
Slide 77 text
Count Records in Groups
16
$ rails g resource event article:belongs_to trigger
$ rails c
Loading development environment (Rails 3.2.3)
>> article = Article.last
=> #
>> {edit: 3, view: 10}.each do |trigger, count|
?> count.times do
?> Event.new(trigger: trigger).tap { |e|
e.article = article; e.save! }
>> end
>> end
=> {:edit=>3, :view=>10}
>> Event.count
=> 13
>> Event.group(:trigger).count
=> {"edit"=>3, "view"=>10}
Slide 78
Slide 78 text
Count Records in Groups
16
$ rails g resource event article:belongs_to trigger
$ rails c
Loading development environment (Rails 3.2.3)
>> article = Article.last
=> #
>> {edit: 3, view: 10}.each do |trigger, count|
?> count.times do
?> Event.new(trigger: trigger).tap { |e|
e.article = article; e.save! }
>> end
>> end
=> {:edit=>3, :view=>10}
>> Event.count
=> 13
>> Event.group(:trigger).count
=> {"edit"=>3, "view"=>10}
Slide 79
Slide 79 text
Allow You to
Override Associations
17
From Josh Susser
class Car < ActiveRecord::Base
belongs_to :owner
belongs_to :previous_owner, class_name: "Owner"
def owner=(new_owner)
self.previous_owner = owner
super
end
end
Slide 80
Slide 80 text
Allow You to
Override Associations
17
From Josh Susser
class Car < ActiveRecord::Base
belongs_to :owner
belongs_to :previous_owner, class_name: "Owner"
def owner=(new_owner)
self.previous_owner = owner
super
end
end
Slide 81
Slide 81 text
Instantiate Records
Without a Database
18
$ rails c
Loading development environment (Rails 3.2.3)
>> User.find(1)
=> #
>> jeg2 = User.instantiate("id" => 1, "email" => "[email protected]")
=> #
>> jeg2.name = "James Edward Gray II"
=> "James Edward Gray II"
>> jeg2.save!
=> true
>> User.find(1)
=> #
Slide 82
Slide 82 text
Instantiate Records
Without a Database
18
$ rails c
Loading development environment (Rails 3.2.3)
>> User.find(1)
=> #
>> jeg2 = User.instantiate("id" => 1, "email" => "[email protected]")
=> #
>> jeg2.name = "James Edward Gray II"
=> "James Edward Gray II"
>> jeg2.save!
=> true
>> User.find(1)
=> #
Slide 83
Slide 83 text
Instantiate Records
Without a Database
18
$ rails c
Loading development environment (Rails 3.2.3)
>> User.find(1)
=> #
>> jeg2 = User.instantiate("id" => 1, "email" => "[email protected]")
=> #
>> jeg2.name = "James Edward Gray II"
=> "James Edward Gray II"
>> jeg2.save!
=> true
>> User.find(1)
=> #
Slide 84
Slide 84 text
Use Limitless Strings
in PostgreSQL
19
From Josh Susser
$ rails g resource user bio
# ...
module PsqlApp
class Application < Rails::Application
# ...
# Switch to limitless strings
initializer "postgresql.no_default_string_limit" do
ActiveSupport.on_load(:active_record) do
adapter = ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
adapter::NATIVE_DATABASE_TYPES[:string].delete(:limit)
end
end
end
end
Slide 85
Slide 85 text
Use Limitless Strings
in PostgreSQL
19
From Josh Susser
$ rails g resource user bio
$ rails c
Loading development environment (Rails 3.2.3)
>> very_long_bio = "X" * 10_000; :set
=> :set
>> User.create!(bio: very_long_bio)
=> #
>> User.last.bio.size
=> 10000
Slide 86
Slide 86 text
Use Limitless Strings
in PostgreSQL
19
From Josh Susser
$ rails g resource user bio
$ rails c
Loading development environment (Rails 3.2.3)
>> very_long_bio = "X" * 10_000; :set
=> :set
>> User.create!(bio: very_long_bio)
=> #
>> User.last.bio.size
=> 10000
Slide 87
Slide 87 text
Use Full Text Search
in PostgreSQL
20
$ rails g resource article subject body:text
From PeepCode
Slide 88
Slide 88 text
Use Full Text Search
in PostgreSQL
20
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.string :subject
t.text :body
t.column :search, "tsvector"
t.timestamps
end
execute <<-END_SQL
CREATE INDEX articles_search_index
ON articles USING gin(search);
CREATE TRIGGER articles_search_update
BEFORE INSERT OR UPDATE ON articles
FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger( search,
'pg_catalog.english',
subject,
body );
END_SQL
end
end
From PeepCode
Slide 89
Slide 89 text
Use Full Text Search
in PostgreSQL
20
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.string :subject
t.text :body
t.column :search, "tsvector"
t.timestamps
end
execute <<-END_SQL
CREATE INDEX articles_search_index
ON articles USING gin(search);
CREATE TRIGGER articles_search_update
BEFORE INSERT OR UPDATE ON articles
FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger( search,
'pg_catalog.english',
subject,
body );
END_SQL
end
end
From PeepCode
Slide 90
Slide 90 text
Use Full Text Search
in PostgreSQL
20
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.string :subject
t.text :body
t.column :search, "tsvector"
t.timestamps
end
execute <<-END_SQL
CREATE INDEX articles_search_index
ON articles USING gin(search);
CREATE TRIGGER articles_search_update
BEFORE INSERT OR UPDATE ON articles
FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger( search,
'pg_catalog.english',
subject,
body );
END_SQL
end
end
From PeepCode
Slide 91
Slide 91 text
Use Full Text Search
in PostgreSQL
20
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.string :subject
t.text :body
t.column :search, "tsvector"
t.timestamps
end
execute <<-END_SQL
CREATE INDEX articles_search_index
ON articles USING gin(search);
CREATE TRIGGER articles_search_update
BEFORE INSERT OR UPDATE ON articles
FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger( search,
'pg_catalog.english',
subject,
body );
END_SQL
end
end
From PeepCode
Slide 92
Slide 92 text
Use Full Text Search
in PostgreSQL
20
From PeepCode
class Article < ActiveRecord::Base
attr_accessible :body, :subject
def self.search(query)
sql = sanitize_sql_array(["plainto_tsquery('english', ?)", query])
where(
"search @@ #{sql}"
).order(
"ts_rank_cd(search, #{sql}) DESC"
)
end
end
Slide 93
Slide 93 text
Use Full Text Search
in PostgreSQL
20
From PeepCode
class Article < ActiveRecord::Base
attr_accessible :body, :subject
def self.search(query)
sql = sanitize_sql_array(["plainto_tsquery('english', ?)", query])
where(
"search @@ #{sql}"
).order(
"ts_rank_cd(search, #{sql}) DESC"
)
end
end
Slide 94
Slide 94 text
Use Full Text Search
in PostgreSQL
20
From PeepCode
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Full Text Search")
=> #
>> Article.create!(body: "A stemmed search.")
=> #
>> Article.create!(body: "You won't find me!")
=> #
>> Article.search("search").map { |a| a.subject || a.body }
=> ["Full Text Search", "A stemmed search."]
>> Article.search("stemming").map { |a| a.subject || a.body }
=> ["A stemmed search."]
Slide 95
Slide 95 text
Use Full Text Search
in PostgreSQL
20
From PeepCode
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Full Text Search")
=> #
>> Article.create!(body: "A stemmed search.")
=> #
>> Article.create!(body: "You won't find me!")
=> #
>> Article.search("search").map { |a| a.subject || a.body }
=> ["Full Text Search", "A stemmed search."]
>> Article.search("stemming").map { |a| a.subject || a.body }
=> ["A stemmed search."]
Slide 96
Slide 96 text
Use Full Text Search
in PostgreSQL
20
From PeepCode
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Full Text Search")
=> #
>> Article.create!(body: "A stemmed search.")
=> #
>> Article.create!(body: "You won't find me!")
=> #
>> Article.search("search").map { |a| a.subject || a.body }
=> ["Full Text Search", "A stemmed search."]
>> Article.search("stemming").map { |a| a.subject || a.body }
=> ["A stemmed search."]
Slide 97
Slide 97 text
Use Different a Database
for Each User
21
def connect_to_user_database(name)
config = ActiveRecord::Base.configurations["development"]
.merge("database" => "db/#{name}.sqlite3")
ActiveRecord::Base.establish_connection(config)
end
Slide 98
Slide 98 text
Use Different a Database
for Each User
21
def connect_to_user_database(name)
config = ActiveRecord::Base.configurations["development"]
.merge("database" => "db/#{name}.sqlite3")
ActiveRecord::Base.establish_connection(config)
end
Slide 99
Slide 99 text
Use Different a Database
for Each User
21
def connect_to_user_database(name)
config = ActiveRecord::Base.configurations["development"]
.merge("database" => "db/#{name}.sqlite3")
ActiveRecord::Base.establish_connection(config)
end
Slide 100
Slide 100 text
Use Different a Database
for Each User
21
def connect_to_user_database(name)
config = ActiveRecord::Base.configurations["development"]
.merge("database" => "db/#{name}.sqlite3")
ActiveRecord::Base.establish_connection(config)
end
require "user_database"
Slide 101
Slide 101 text
Use Different a Database
for Each User
21
namespace :db do
desc "Add a new user database"
task :add => %w[environment load_config] do
name = ENV.fetch("DB_NAME") { fail "DB_NAME is required" }
connect_to_user_database(name)
ActiveRecord::Base.connection
end
namespace :migrate do
desc "Migrate all user databases"
task :all => %w[environment load_config] do
ActiveRecord::Migration.verbose = ENV.fetch("VERBOSE", "true") == "true"
Dir.glob("db/*.sqlite3") do |file|
next if file == "db/test.sqlite3"
connect_to_user_database(File.basename(file, ".sqlite3"))
ActiveRecord::Migrator.migrate(
ActiveRecord::Migrator.migrations_paths,
ENV["VERSION"] && ENV["VERSION"].to_i
) do |migration|
ENV["SCOPE"].blank? || (ENV["SCOPE"] == migration.scope)
end
end
end
end
end
Slide 102
Slide 102 text
Use Different a Database
for Each User
21
namespace :db do
desc "Add a new user database"
task :add => %w[environment load_config] do
name = ENV.fetch("DB_NAME") { fail "DB_NAME is required" }
connect_to_user_database(name)
ActiveRecord::Base.connection
end
namespace :migrate do
desc "Migrate all user databases"
task :all => %w[environment load_config] do
ActiveRecord::Migration.verbose = ENV.fetch("VERBOSE", "true") == "true"
Dir.glob("db/*.sqlite3") do |file|
next if file == "db/test.sqlite3"
connect_to_user_database(File.basename(file, ".sqlite3"))
ActiveRecord::Migrator.migrate(
ActiveRecord::Migrator.migrations_paths,
ENV["VERSION"] && ENV["VERSION"].to_i
) do |migration|
ENV["SCOPE"].blank? || (ENV["SCOPE"] == migration.scope)
end
end
end
end
end
Slide 103
Slide 103 text
Use Different a Database
for Each User
21
$ rails g resource user name
$ rake db:add DB_NAME=ruby_rogues
$ rake db:add DB_NAME=grays
$ rake db:migrate:all
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0008s
== CreateUsers: migrated (0.0008s) =========================
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0007s
== CreateUsers: migrated (0.0008s) =========================
Slide 104
Slide 104 text
Use Different a Database
for Each User
21
$ rails g resource user name
$ rake db:add DB_NAME=ruby_rogues
$ rake db:add DB_NAME=grays
$ rake db:migrate:all
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0008s
== CreateUsers: migrated (0.0008s) =========================
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0007s
== CreateUsers: migrated (0.0008s) =========================
Slide 105
Slide 105 text
Use Different a Database
for Each User
21
$ rails g resource user name
$ rake db:add DB_NAME=ruby_rogues
$ rake db:add DB_NAME=grays
$ rake db:migrate:all
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0008s
== CreateUsers: migrated (0.0008s) =========================
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0007s
== CreateUsers: migrated (0.0008s) =========================
Slide 106
Slide 106 text
Use Different a Database
for Each User
21
$ rails c
>> connect_to_user_database("ruby_rogues")
=> #
>> User.create!(name: "Chuck")
=> #
>> User.create!(name: "Josh")
=> #
>> User.create!(name: "Avdi")
=> #
…
>> connect_to_user_database("grays")
=> #
>> User.create!(name: "James")
=> #
>> User.create!(name: "Dana")
=> #
>> User.create!(name: "Summer")
=> #
Slide 107
Slide 107 text
Use Different a Database
for Each User
21
$ rails c
>> connect_to_user_database("ruby_rogues")
=> #
>> User.create!(name: "Chuck")
=> #
>> User.create!(name: "Josh")
=> #
>> User.create!(name: "Avdi")
=> #
…
>> connect_to_user_database("grays")
=> #
>> User.create!(name: "James")
=> #
>> User.create!(name: "Dana")
=> #
>> User.create!(name: "Summer")
=> #
Slide 108
Slide 108 text
Use Different a Database
for Each User
21
$ rails c
>> connect_to_user_database("ruby_rogues")
=> #
>> User.create!(name: "Chuck")
=> #
>> User.create!(name: "Josh")
=> #
>> User.create!(name: "Avdi")
=> #
…
>> connect_to_user_database("grays")
=> #
>> User.create!(name: "James")
=> #
>> User.create!(name: "Dana")
=> #
>> User.create!(name: "Summer")
=> #
Slide 109
Slide 109 text
Use Different a Database
for Each User
21
class ApplicationController < ActionController::Base
protect_from_forgery
before_filter :connect_to_database
private
def connect_to_database
connect_to_user_database(request.subdomains.first)
end
end
Slide 110
Slide 110 text
Use Different a Database
for Each User
21
class ApplicationController < ActionController::Base
protect_from_forgery
before_filter :connect_to_database
private
def connect_to_database
connect_to_user_database(request.subdomains.first)
end
end
Slide 111
Slide 111 text
Use Different a Database
for Each User
21
Slide 112
Slide 112 text
Use Different a Database
for Each User
21
Slide 113
Slide 113 text
Intermission
Am I going to make it???
Slide 114
Slide 114 text
Why Do This?
I’m trying to give you new ideas
Studies show this will help you solve Rails problems
Also, it’s fun!
Remember to have fun
Slide 115
Slide 115 text
Less Talk, More Tricks!!!
Slide 116
Slide 116 text
Refine Your Fashion Sense
http://www.flickr.com/photos/oreillyconf/5735037920/
22
Slide 117
Slide 117 text
Refine Your Fashion Sense
http://www.flickr.com/photos/oreillyconf/5735037920/ http://www.flickr.com/photos/oreillyconf/5735038376/
22
Slide 118
Slide 118 text
Refine Your Fashion Sense
http://www.flickr.com/photos/oreillyconf/5735037920/ http://www.flickr.com/photos/oreillyconf/5735038376/ http://www.flickr.com/photos/aaronp/4609780419/
22
Slide 119
Slide 119 text
Ruby Extensions
Updating Ruby’s fashion sense
Slide 120
Slide 120 text
Write Files Atomically
23
class Comment < ActiveRecord::Base
# ...
Q_DIR = (Rails.root + "comment_queue").tap(&:mkpath)
after_save :queue_comment
def queue_comment
File.atomic_write(Q_DIR + "#{id}.txt") do |f|
f.puts "Article: #{article.subject}"
f.puts "User: #{user.name}"
f.puts body
end
end
end
Slide 121
Slide 121 text
Write Files Atomically
23
class Comment < ActiveRecord::Base
# ...
Q_DIR = (Rails.root + "comment_queue").tap(&:mkpath)
after_save :queue_comment
def queue_comment
File.atomic_write(Q_DIR + "#{id}.txt") do |f|
f.puts "Article: #{article.subject}"
f.puts "User: #{user.name}"
f.puts body
end
end
end
Slide 122
Slide 122 text
Write Files Atomically
23
$ ls comment_queue
ls: comment_queue: No such file or directory
$ rails r 'Comment.new(body: "Queue me.").tap { |c|
c.article, c.user = Article.first, User.first; c.save! }'
$ ls comment_queue
1.txt
$ cat comment_queue/1.txt
Article: JEG2's Rails Hacks
User: James Edward Gray II
Queue me.
Slide 123
Slide 123 text
Write Files Atomically
23
$ ls comment_queue
ls: comment_queue: No such file or directory
$ rails r 'Comment.new(body: "Queue me.").tap { |c|
c.article, c.user = Article.first, User.first; c.save! }'
$ ls comment_queue
1.txt
$ cat comment_queue/1.txt
Article: JEG2's Rails Hacks
User: James Edward Gray II
Queue me.
Slide 124
Slide 124 text
Merge Nested Hashes
24
$ rails c
Loading development environment (Rails 3.2.3)
>> {nested: {one: 1}}.merge(nested: {two: 2})
=> {:nested=>{:two=>2}}
>> {nested: {one: 1}}.deep_merge(nested: {two: 2})
=> {:nested=>{:one=>1, :two=>2}}
Slide 125
Slide 125 text
Merge Nested Hashes
24
$ rails c
Loading development environment (Rails 3.2.3)
>> {nested: {one: 1}}.merge(nested: {two: 2})
=> {:nested=>{:two=>2}}
>> {nested: {one: 1}}.deep_merge(nested: {two: 2})
=> {:nested=>{:one=>1, :two=>2}}
Slide 126
Slide 126 text
Remove Specific Keys
From a Hash
25
$ rails c
Loading development environment (Rails 3.2.3)
>> params = {controller: "home", action: "index", from: "Google"}
=> {:controller=>"home", :action=>"index", :from=>"Google"}
>> params.except(:controller, :action)
=> {:from=>"Google"}
Slide 127
Slide 127 text
Remove Specific Keys
From a Hash
25
$ rails c
Loading development environment (Rails 3.2.3)
>> params = {controller: "home", action: "index", from: "Google"}
=> {:controller=>"home", :action=>"index", :from=>"Google"}
>> params.except(:controller, :action)
=> {:from=>"Google"}
Slide 128
Slide 128 text
Add Defaults to Hash
26
$ rails c
Loading development environment (Rails 3.2.3)
>> {required: true}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true}.reverse_merge(optional: true)
=> {:optional=>true, :required=>true}
>> {required: true, optional: false}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true, optional: false}.reverse_merge(optional: true)
=> {:optional=>false, :required=>true}
Slide 129
Slide 129 text
Add Defaults to Hash
26
$ rails c
Loading development environment (Rails 3.2.3)
>> {required: true}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true}.reverse_merge(optional: true)
=> {:optional=>true, :required=>true}
>> {required: true, optional: false}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true, optional: false}.reverse_merge(optional: true)
=> {:optional=>false, :required=>true}
Slide 130
Slide 130 text
Add Defaults to Hash
26
$ rails c
Loading development environment (Rails 3.2.3)
>> {required: true}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true}.reverse_merge(optional: true)
=> {:optional=>true, :required=>true}
>> {required: true, optional: false}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true, optional: false}.reverse_merge(optional: true)
=> {:optional=>false, :required=>true}
Slide 131
Slide 131 text
Add Defaults to Hash
26
$ rails c
Loading development environment (Rails 3.2.3)
>> {required: true}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true}.reverse_merge(optional: true)
=> {:optional=>true, :required=>true}
>> {required: true, optional: false}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true, optional: false}.reverse_merge(optional: true)
=> {:optional=>false, :required=>true}
Slide 132
Slide 132 text
Answer Questions
About Strings
27
$ rails g migration add_status_to_articles status
Slide 133
Slide 133 text
Answer Questions
About Strings
27
$ rails g migration add_status_to_articles status
class AddStatusToArticles < ActiveRecord::Migration
def change
add_column :articles, :status, :string, default: "Draft", null: false
end
end
Slide 134
Slide 134 text
Answer Questions
About Strings
27
$ rails g migration add_status_to_articles status
class AddStatusToArticles < ActiveRecord::Migration
def change
add_column :articles, :status, :string, default: "Draft", null: false
end
end
Slide 135
Slide 135 text
Answer Questions
About Strings
27
$ rails c
Loading development environment (Rails 3.2.3)
>> env = Rails.env
=> "development"
>> env.development?
=> true
>> env.test?
=> false
>> "magic".inquiry.magic?
=> true
>> article = Article.first
=> #
>> article.draft?
=> true
>> article.published?
=> false
Slide 136
Slide 136 text
Answer Questions
About Strings
27
$ rails c
Loading development environment (Rails 3.2.3)
>> env = Rails.env
=> "development"
>> env.development?
=> true
>> env.test?
=> false
>> "magic".inquiry.magic?
=> true
>> article = Article.first
=> #
>> article.draft?
=> true
>> article.published?
=> false
Slide 137
Slide 137 text
Answer Questions
About Strings
27
$ rails c
Loading development environment (Rails 3.2.3)
>> env = Rails.env
=> "development"
>> env.development?
=> true
>> env.test?
=> false
>> "magic".inquiry.magic?
=> true
>> article = Article.first
=> #
>> article.draft?
=> true
>> article.published?
=> false
Slide 138
Slide 138 text
Answer Questions
About Strings
27
$ rails c
Loading development environment (Rails 3.2.3)
>> env = Rails.env
=> "development"
>> env.development?
=> true
>> env.test?
=> false
>> "magic".inquiry.magic?
=> true
>> article = Article.first
=> #
>> article.draft?
=> true
>> article.published?
=> false
Slide 139
Slide 139 text
Answer Questions
About Strings
27
class Article < ActiveRecord::Base
# ...
STATUSES = %w[Draft Published]
validates_inclusion_of :status, in: STATUSES
def method_missing(method, *args, &block)
if method =~ /\A#{STATUSES.map(&:downcase).join("|")}\?\z/
status.downcase.inquiry.send(method)
else
super
end
end
end
Slide 140
Slide 140 text
Answer Questions
About Strings
27
class Article < ActiveRecord::Base
# ...
STATUSES = %w[Draft Published]
validates_inclusion_of :status, in: STATUSES
def method_missing(method, *args, &block)
if method =~ /\A#{STATUSES.map(&:downcase).join("|")}\?\z/
status.downcase.inquiry.send(method)
else
super
end
end
end
Slide 141
Slide 141 text
Answer Questions
About Strings
27
class Article < ActiveRecord::Base
# ...
STATUSES = %w[Draft Published]
validates_inclusion_of :status, in: STATUSES
def method_missing(method, *args, &block)
if method =~ /\A#{STATUSES.map(&:downcase).join("|")}\?\z/
status.downcase.inquiry.send(method)
else
super
end
end
end
Slide 142
Slide 142 text
Get you on
the cover of
a magazine
The hairdo may be
required
http://www.rubyinside.com/rubys-popularity-scales-new-heights-19.html
28
Slide 143
Slide 143 text
Get you voted
“Hottest Hacker”
http://pageman.multiply.com/links/item/21/David_Heinemeier_Hanssons_Blog
29
Slide 144
Slide 144 text
Get you voted
“Hottest Hacker”
http://pageman.multiply.com/links/item/21/David_Heinemeier_Hanssons_Blog
29
Slide 145
Slide 145 text
Get you voted
“Hottest Hacker”
http://pageman.multiply.com/links/item/21/David_Heinemeier_Hanssons_Blog http://torrentfreak.com/richard-stallman-opts-to-disobey-anti-piracy-law-110610/
29
Slide 146
Slide 146 text
Views
It’s all about how we look
Slide 147
Slide 147 text
Hide Comments
From Your Users
30
<%# ERb comments do not %>
Home Page
From The Rails ViewSlide 148
Slide 148 text
Hide Comments
From Your Users
30
<%# ERb comments do not %>
Home Page
From The Rails ViewSlide 149
Slide 149 text
Hide Comments
From Your Users
30
<%# ERb comments do not %>
Home Page
Home Page
From The Rails ViewSlide 150
Slide 150 text
Understand a Shorter
ERb Syntax
31
# ...
module Blog
class Application < Rails::Application
# ...
# Broken: config.action_view.erb_trim_mode = '%'
ActionView::Template::Handlers::ERB.erb_implementation =
Class.new(ActionView::Template::Handlers::Erubis) do
include ::Erubis::PercentLineEnhancer
end
end
end
% if current_user.try(:admin?)
<%= render "edit_links" %>
% end
Slide 151
Slide 151 text
Understand a Shorter
ERb Syntax
31
# ...
module Blog
class Application < Rails::Application
# ...
# Broken: config.action_view.erb_trim_mode = '%'
ActionView::Template::Handlers::ERB.erb_implementation =
Class.new(ActionView::Template::Handlers::Erubis) do
include ::Erubis::PercentLineEnhancer
end
end
end
% if current_user.try(:admin?)
<%= render "edit_links" %>
% end
Slide 152
Slide 152 text
Understand a Shorter
ERb Syntax
31
# ...
module Blog
class Application < Rails::Application
# ...
# Broken: config.action_view.erb_trim_mode = '%'
ActionView::Template::Handlers::ERB.erb_implementation =
Class.new(ActionView::Template::Handlers::Erubis) do
include ::Erubis::PercentLineEnhancer
end
end
end
% if current_user.try(:admin?)
<%= render "edit_links" %>
% end
Slide 153
Slide 153 text
Understand a Shorter
ERb Syntax
31
# ...
module Blog
class Application < Rails::Application
# ...
# Broken: config.action_view.erb_trim_mode = '%'
ActionView::Template::Handlers::ERB.erb_implementation =
Class.new(ActionView::Template::Handlers::Erubis) do
include ::Erubis::PercentLineEnhancer
end
end
end
% if current_user.try(:admin?)
<%= render "edit_links" %>
% end
Slide 154
Slide 154 text
Use Blocks to Avoid
Assignments in Views
32
<% @cart.products.each do |product| %>
<%= product.name %>
<%= number_to_currency product.price %>
<% end %>
Subtotal
<%= number_to_currency @cart.total %>
Tax
<%= number_to_currency(tax = calculate_tax(@cart.total)) %>
Total
<%= number_to_currency(@cart.total + tax) %>
From The Rails View
Slide 155
Slide 155 text
Use Blocks to Avoid
Assignments in Views
32
<% @cart.products.each do |product| %>
<%= product.name %>
<%= number_to_currency product.price %>
<% end %>
Subtotal
<%= number_to_currency @cart.total %>
Tax
<%= number_to_currency(tax = calculate_tax(@cart.total)) %>
Total
<%= number_to_currency(@cart.total + tax) %>
From The Rails View
Slide 156
Slide 156 text
Use Blocks to Avoid
Assignments in Views
32
<% @cart.products.each do |product| %>
<%= product.name %>
<%= number_to_currency product.price %>
<% end %>
Subtotal
<%= number_to_currency @cart.total %>
Tax
<%= number_to_currency(tax = calculate_tax(@cart.total)) %>
Total
<%= number_to_currency(@cart.total + tax) %>
From The Rails View
Slide 157
Slide 157 text
<% @cart.products.each do |product| %>
<%= product.name %>
<%= number_to_currency product.price %>
<% end %>
Subtotal
<%= number_to_currency @cart.total %>
<% calculate_tax @cart.total do |tax| %>
Tax
<%= number_to_currency tax %>
Total
<%= number_to_currency(@cart.total + tax) %>
<% end %>
Use Blocks to Avoid
Assignments in Views
32
From The Rails View
Slide 158
Slide 158 text
<% @cart.products.each do |product| %>
<%= product.name %>
<%= number_to_currency product.price %>
<% end %>
Subtotal
<%= number_to_currency @cart.total %>
<% calculate_tax @cart.total do |tax| %>
Tax
<%= number_to_currency tax %>
Total
<%= number_to_currency(@cart.total + tax) %>
<% end %>
Use Blocks to Avoid
Assignments in Views
32
From The Rails View
Slide 159
Slide 159 text
Use Blocks to Avoid
Assignments in Views
32
module CartHelper
def calculate_tax(total, user = current_user)
tax = TaxTable.for(user).calculate(total)
if block_given?
yield tax
else
tax
end
end
end
From The Rails View
Slide 160
Slide 160 text
Use Blocks to Avoid
Assignments in Views
32
module CartHelper
def calculate_tax(total, user = current_user)
tax = TaxTable.for(user).calculate(total)
if block_given?
yield tax
else
tax
end
end
end
From The Rails View
Slide 161
Slide 161 text
Generate Multiple Tags
at Once
33
From José Valim
Articles
<% @articles.each do |article| %> <%= content_tag_for(:div, article) do %><%= article.subject %>
<% end %> <% end %>Slide 162
Slide 162 text
Generate Multiple Tags
at Once
33
From José Valim
Articles
<% @articles.each do |article| %> <%= content_tag_for(:div, article) do %><%= article.subject %>
<% end %> <% end %>Slide 163
Slide 163 text
Generate Multiple Tags
at Once
33
From José Valim
Articles
<% @articles.each do |article| %> <%= content_tag_for(:div, article) do %><%= article.subject %>
<% end %> <% end %>Articles
<%= content_tag_for(:div, @articles) do |article| %><%= article.subject %>
<% end %>Slide 164
Slide 164 text
Generate Multiple Tags
at Once
33
From José Valim
Articles
<% @articles.each do |article| %> <%= content_tag_for(:div, article) do %><%= article.subject %>
<% end %> <% end %>Articles
<%= content_tag_for(:div, @articles) do |article| %><%= article.subject %>
<% end %>Slide 165
Slide 165 text
Render Any Object
34
From José Valim
class Event < ActiveRecord::Base
# ...
def to_partial_path
"events/#{trigger}" # events/edit or events/view
end
end
Slide 166
Slide 166 text
Render Any Object
34
From José Valim
class Event < ActiveRecord::Base
# ...
def to_partial_path
"events/#{trigger}" # events/edit or events/view
end
end
<%= render partial: @events, as: :event %>
Slide 167
Slide 167 text
Render Any Object
34
From José Valim
class Event < ActiveRecord::Base
# ...
def to_partial_path
"events/#{trigger}" # events/edit or events/view
end
end
<%= render partial: @events, as: :event %>
Slide 168
Slide 168 text
Render Any Object
34
From José Valim
class Event < ActiveRecord::Base
# ...
def to_partial_path
"events/#{trigger}" # events/edit or events/view
end
end
<%= render partial: @events, as: :event %>
Slide 169
Slide 169 text
Group Menu Entries
35
From The Rails View
Slide 170
Slide 170 text
Group Menu Entries
35
From The Rails View
<%= select_tag( :grouped_menu, grouped_options_for_select(
"Group A" => %w[One Two Three],
"Group B" => %w[One Two Three]
) ) %>
Slide 171
Slide 171 text
Group Menu Entries
35
From The Rails View
<%= select_tag( :grouped_menu, grouped_options_for_select(
"Group A" => %w[One Two Three],
"Group B" => %w[One Two Three]
) ) %>
Slide 172
Slide 172 text
Build Forms
the Way You Like Them
36
From The Rails View
class LabeledFieldsWithErrors < ActionView::Helpers::FormBuilder
def errors_for(attribute)
if (errors = object.errors[attribute]).any?
@template.content_tag(:span, errors.to_sentence, class: "error")
end
end
def method_missing(method, *args, &block)
if %r{ \A (?labeled_)?
(?\w+?)
(?_with_errors)? \z }x =~ method and
respond_to?(wrapped) and [labeled, with_errors].any?(&:present?)
attribute, tags = args.first, [ ]
tags << label(attribute) if labeled.present?
tags << send(wrapped, *args, &block)
tags << errors_for(attribute) if with_errors.present?
tags.join(" ").html_safe
else
super
end
end
end
Slide 173
Slide 173 text
Build Forms
the Way You Like Them
36
From The Rails View
class LabeledFieldsWithErrors < ActionView::Helpers::FormBuilder
def errors_for(attribute)
if (errors = object.errors[attribute]).any?
@template.content_tag(:span, errors.to_sentence, class: "error")
end
end
def method_missing(method, *args, &block)
if %r{ \A (?labeled_)?
(?\w+?)
(?_with_errors)? \z }x =~ method and
respond_to?(wrapped) and [labeled, with_errors].any?(&:present?)
attribute, tags = args.first, [ ]
tags << label(attribute) if labeled.present?
tags << send(wrapped, *args, &block)
tags << errors_for(attribute) if with_errors.present?
tags.join(" ").html_safe
else
super
end
end
end
Slide 174
Slide 174 text
Build Forms
the Way You Like Them
36
From The Rails View
class LabeledFieldsWithErrors < ActionView::Helpers::FormBuilder
def errors_for(attribute)
if (errors = object.errors[attribute]).any?
@template.content_tag(:span, errors.to_sentence, class: "error")
end
end
def method_missing(method, *args, &block)
if %r{ \A (?labeled_)?
(?\w+?)
(?_with_errors)? \z }x =~ method and
respond_to?(wrapped) and [labeled, with_errors].any?(&:present?)
attribute, tags = args.first, [ ]
tags << label(attribute) if labeled.present?
tags << send(wrapped, *args, &block)
tags << errors_for(attribute) if with_errors.present?
tags.join(" ").html_safe
else
super
end
end
end
Slide 175
Slide 175 text
Build Forms
the Way You Like Them
36
From The Rails View
class LabeledFieldsWithErrors < ActionView::Helpers::FormBuilder
def errors_for(attribute)
if (errors = object.errors[attribute]).any?
@template.content_tag(:span, errors.to_sentence, class: "error")
end
end
def method_missing(method, *args, &block)
if %r{ \A (?labeled_)?
(?\w+?)
(?_with_errors)? \z }x =~ method and
respond_to?(wrapped) and [labeled, with_errors].any?(&:present?)
attribute, tags = args.first, [ ]
tags << label(attribute) if labeled.present?
tags << send(wrapped, *args, &block)
tags << errors_for(attribute) if with_errors.present?
tags.join(" ").html_safe
else
super
end
end
end
Slide 176
Slide 176 text
Build Forms
the Way You Like Them
36
From The Rails View
# ...
module Blog
class Application < Rails::Application
# ...
require "labeled_fields_with_errors"
config.action_view.default_form_builder = LabeledFieldsWithErrors
config.action_view.field_error_proc = ->(field, _) { field }
end
end
Slide 177
Slide 177 text
Build Forms
the Way You Like Them
36
From The Rails View
# ...
module Blog
class Application < Rails::Application
# ...
require "labeled_fields_with_errors"
config.action_view.default_form_builder = LabeledFieldsWithErrors
config.action_view.field_error_proc = ->(field, _) { field }
end
end
Slide 178
Slide 178 text
Build Forms
the Way You Like Them
36
From The Rails View
# ...
module Blog
class Application < Rails::Application
# ...
require "labeled_fields_with_errors"
config.action_view.default_form_builder = LabeledFieldsWithErrors
config.action_view.field_error_proc = ->(field, _) { field }
end
end
Slide 179
Slide 179 text
Build Forms
the Way You Like Them
36
From The Rails View
<%= form_for @article do |f| %>
<%= f.text_field :subject %>
<%= f.labeled_text_field :subject %>
<%= f.text_field_with_errors :subject %>
<%= f.labeled_text_field_with_errors :subject %>
<%= f.submit %> <% end %>Slide 180
Slide 180 text
Build Forms
the Way You Like Them
36
From The Rails View
<%= form_for @article do |f| %>
<%= f.text_field :subject %>
<%= f.labeled_text_field :subject %>
<%= f.text_field_with_errors :subject %>
<%= f.labeled_text_field_with_errors :subject %>
<%= f.submit %> <% end %>Slide 181
Slide 181 text
Build Forms
the Way You Like Them
36
From The Rails View
Subject
can't be blank
Subject can't be blank
Slide 182
Slide 182 text
Build Forms
the Way You Like Them
36
From The Rails View
Subject
can't be blank
Subject can't be blank
Slide 183
Slide 183 text
Build Forms
the Way You Like Them
36
From The Rails View
Subject
can't be blank
Subject can't be blank
Slide 184
Slide 184 text
Inspire Theme Songs
About Your Work
http://www.confreaks.com/videos/529-farmhouseconf-ruby-hero-tenderlove
37
Slide 185
Slide 185 text
The Router and Controllers
They carry the theme of our applications
Slide 186
Slide 186 text
Route Exceptions
From José Valim
38
# ...
module Blog
class Application < Rails::Application
# ...
config.exceptions_app = routes
end
end
Slide 187
Slide 187 text
Route Exceptions
From José Valim
38
# ...
module Blog
class Application < Rails::Application
# ...
config.exceptions_app = routes
end
end
Slide 188
Slide 188 text
Route Exceptions
From José Valim
38
# ...
module Blog
class Application < Rails::Application
# ...
config.exceptions_app = routes
end
end
Blog::Application.routes.draw do
# ...
match "/404", to: "errors#not_found"
end
Slide 189
Slide 189 text
Route Exceptions
From José Valim
38
# ...
module Blog
class Application < Rails::Application
# ...
config.exceptions_app = routes
end
end
Blog::Application.routes.draw do
# ...
match "/404", to: "errors#not_found"
end
Slide 190
Slide 190 text
Route to Sinatra
From Crafting Rails Applications
39
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
Slide 191
Slide 191 text
Route to Sinatra
From Crafting Rails Applications
39
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
Slide 192
Slide 192 text
Route to Sinatra
From Crafting Rails Applications
39
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
module AdminValidator
module_function
def matches?(request)
if (id = request.env["rack.session"]["user_id"])
current_user = User.find_by_id(id)
current_user.try(:admin?)
else
false
end
end
end
Slide 193
Slide 193 text
Route to Sinatra
From Crafting Rails Applications
39
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
module AdminValidator
module_function
def matches?(request)
if (id = request.env["rack.session"]["user_id"])
current_user = User.find_by_id(id)
current_user.try(:admin?)
else
false
end
end
end
Slide 194
Slide 194 text
Route to Sinatra
From Crafting Rails Applications
39
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
module AdminValidator
module_function
def matches?(request)
if (id = request.env["rack.session"]["user_id"])
current_user = User.find_by_id(id)
current_user.try(:admin?)
else
false
end
end
end
Slide 195
Slide 195 text
Route to Sinatra
From Crafting Rails Applications
39
Blog::Application.routes.draw do
# ...
require "admin_validator"
constraints AdminValidator do
mount Resque::Server, at: "/admin/resque"
end
end
Slide 196
Slide 196 text
Route to Sinatra
From Crafting Rails Applications
39
Blog::Application.routes.draw do
# ...
require "admin_validator"
constraints AdminValidator do
mount Resque::Server, at: "/admin/resque"
end
end
Slide 197
Slide 197 text
Route to Sinatra
From Crafting Rails Applications
39
Blog::Application.routes.draw do
# ...
require "admin_validator"
constraints AdminValidator do
mount Resque::Server, at: "/admin/resque"
end
end
Slide 198
Slide 198 text
Route to Sinatra
From Crafting Rails Applications
39
Blog::Application.routes.draw do
# ...
require "admin_validator"
constraints AdminValidator do
mount Resque::Server, at: "/admin/resque"
end
end
Slide 199
Slide 199 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 200
Slide 200 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 201
Slide 201 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 202
Slide 202 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 203
Slide 203 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 204
Slide 204 text
Stream CSV to Users
40
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
end
end
end
end
end
# ...
end
Slide 205
Slide 205 text
Do Some Work
in the Background
From Crafting Rails Applications
41
$ rails g migration add_stats_to_articles stats:text
Slide 206
Slide 206 text
Do Some Work
in the Background
From Crafting Rails Applications
41
$ rails g migration add_stats_to_articles stats:text
Slide 207
Slide 207 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
serialize :stats
def calculate_stats
words = Hash.new(0)
body.to_s.scan(/\S+/) { |word| words[word] += 1 }
sleep 10 # simulate a lot of work
self.stats = {words: words}
end
end
$ rails g migration add_stats_to_articles stats:text
Slide 208
Slide 208 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
serialize :stats
def calculate_stats
words = Hash.new(0)
body.to_s.scan(/\S+/) { |word| words[word] += 1 }
sleep 10 # simulate a lot of work
self.stats = {words: words}
end
end
$ rails g migration add_stats_to_articles stats:text
Slide 209
Slide 209 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
end
Slide 210
Slide 210 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
end
Slide 211
Slide 211 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
end
Slide 212
Slide 212 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
end
Slide 213
Slide 213 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
end
Slide 214
Slide 214 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
after_create :add_stats
def add_stats
self.class.queue << -> { calculate_stats; save }
end
end
Slide 215
Slide 215 text
Do Some Work
in the Background
From Crafting Rails Applications
41
class Article < ActiveRecord::Base
# ...
after_create :add_stats
def add_stats
self.class.queue << -> { calculate_stats; save }
end
end
Slide 216
Slide 216 text
Do Some Work
in the Background
From Crafting Rails Applications
41
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Stats", body: "Lorem ipsum…");
Time.now.strftime("%H:%M:%S")
=> "15:24:10"
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=> [nil, "15:24:13"]
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=>[{:words=>{"Lorem"=>1, "ipsum"=>1, …}, "15:24:26"]
Slide 217
Slide 217 text
Do Some Work
in the Background
From Crafting Rails Applications
41
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Stats", body: "Lorem ipsum…");
Time.now.strftime("%H:%M:%S")
=> "15:24:10"
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=> [nil, "15:24:13"]
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=>[{:words=>{"Lorem"=>1, "ipsum"=>1, …}, "15:24:26"]
Slide 218
Slide 218 text
Do Some Work
in the Background
From Crafting Rails Applications
41
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Stats", body: "Lorem ipsum…");
Time.now.strftime("%H:%M:%S")
=> "15:24:10"
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=> [nil, "15:24:13"]
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=>[{:words=>{"Lorem"=>1, "ipsum"=>1, …}, "15:24:26"]
Slide 219
Slide 219 text
Have We All Learned
Something New Yet?!
Slide 220
Slide 220 text
Publish a Static Site
Using Rails
42
Static::Application.configure do
# ...
# Show full error reports and disable caching
config.consider_all_requests_local = true
config.action_controller.perform_caching = !!ENV["GENERATING_SITE"]
# ...
# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = !ENV["GENERATING_SITE"]
# Generate digests for assets URLs
config.assets.digest = !!ENV["GENERATING_SITE"]
# ...
end
Slide 221
Slide 221 text
Publish a Static Site
Using Rails
42
Static::Application.configure do
# ...
# Show full error reports and disable caching
config.consider_all_requests_local = true
config.action_controller.perform_caching = !!ENV["GENERATING_SITE"]
# ...
# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = !ENV["GENERATING_SITE"]
# Generate digests for assets URLs
config.assets.digest = !!ENV["GENERATING_SITE"]
# ...
end
Slide 222
Slide 222 text
Publish a Static Site
Using Rails
42
class ApplicationController < ActionController::Base
protect_from_forgery
if ENV["GENERATING_SITE"]
after_filter do |c|
c.cache_page(nil, nil, Zlib::BEST_COMPRESSION)
end
end
end
Slide 223
Slide 223 text
Publish a Static Site
Using Rails
42
class ApplicationController < ActionController::Base
protect_from_forgery
if ENV["GENERATING_SITE"]
after_filter do |c|
c.cache_page(nil, nil, Zlib::BEST_COMPRESSION)
end
end
end
Slide 224
Slide 224 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
site = ENV.fetch("RSYNC_SITE_TO") { fail "Must set RSYNC_SITE_TO" }
server = spawn( {"GENERATING_SITE" => "true"},
"bundle exec rails s thin -p 3001" )
sleep 10 # FIXME: start when the server is up
# ...
end
Slide 225
Slide 225 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
site = ENV.fetch("RSYNC_SITE_TO") { fail "Must set RSYNC_SITE_TO" }
server = spawn( {"GENERATING_SITE" => "true"},
"bundle exec rails s thin -p 3001" )
sleep 10 # FIXME: start when the server is up
# ...
end
Slide 226
Slide 226 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
# ...
# FIXME: improve the following super crude spider
paths = %w[/]
files = [ ]
while path = paths.shift
files << File.join("public", path.sub(%r{/\z}, "/index") + ".html")
File.unlink(files.last) if File.exist? files.last
files << files.last + ".gz"
File.unlink(files.last) if File.exist? files.last
page = open("http://localhost:3001#{path}") { |url| url.read }
page.scan(/]+href="([^"]+)"/) do |link|
paths << link.first
end
end
# ...
end
end
Slide 227
Slide 227 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
# ...
# FIXME: improve the following super crude spider
paths = %w[/]
files = [ ]
while path = paths.shift
files << File.join("public", path.sub(%r{/\z}, "/index") + ".html")
File.unlink(files.last) if File.exist? files.last
files << files.last + ".gz"
File.unlink(files.last) if File.exist? files.last
page = open("http://localhost:3001#{path}") { |url| url.read }
page.scan(/]+href="([^"]+)"/) do |link|
paths << link.first
end
end
# ...
end
end
Slide 228
Slide 228 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
# ...
system("rsync -a public #{site}")
Process.kill("INT", server)
Process.wait(server)
system("bundle exec rake assets:clean")
files.each do |file|
File.unlink(file)
end
end
end
Slide 229
Slide 229 text
Publish a Static Site
Using Rails
42
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
# ...
system("rsync -a public #{site}")
Process.kill("INT", server)
Process.wait(server)
system("bundle exec rake assets:clean")
files.each do |file|
File.unlink(file)
end
end
end
Slide 230
Slide 230 text
Publish a Static Site
Using Rails
42
$ rake static:generate RSYNC_SITE_TO=/Users/james/Desktop
Slide 231
Slide 231 text
Publish a Static Site
Using Rails
42
$ rake static:generate RSYNC_SITE_TO=/Users/james/Desktop
Slide 232
Slide 232 text
Did you memorize that?!
Slide 233
Slide 233 text
Did you memorize that?!
Slides: http://speakerdeck.com/u/jeg2
Twitter: @JEG2
Email: [email protected]
Slide 234
Slide 234 text
Thanks!
Have fun using these Rails tricks