10 Things You Didn't Know Rails Could do

My talk from RailsConf 2012, in Austin, TX. It's a collection of random tricks you can do with Rails.

Transcript

1. 10 Things You Didn’t Know Rails Could Do
2. 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
3. 10 Things You Didn’t Know Rails Could Do
4. 10 Things You Didn’t Know Rails Could Do 4.2⨉ more awesome! 42
5. Rails 3.2.3 Can…
6. Get You a Hug, Every Friday 1 http://hugfriday.com/
7. Get You a Hug, Every Friday 1 http://hugfriday.com/
8. Get You a Hug, Every Friday 1 http://hugfriday.com/
9. Get You a Hug, Every Friday 1 http://hugfriday.com/
10. Get You a Hug, Every Friday 1 http://hugfriday.com/
11. Get You a Hug, Every Friday 1 http://hugfriday.com/
12. Get You a Hug, Every Friday 1 http://hugfriday.com/
13. Interfaces Ways to give Rails a hug
14. Run From a Single File From Avdi Grimm 2
15. Run From a Single File From Avdi Grimm 2
16. Run From a Single File From Avdi Grimm 2
17. Run From a Single File From Avdi Grimm 2
18. Run From a Single File From Avdi Grimm 2
19. Remind You of Things 3 class UsersController < ApplicationController # TODO: Make it possible to create new users. end
20. 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
21. <%# 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
22. $ 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
23. $ 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
24. <%# 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?
25. <%# 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?
26. 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.
27. 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.
28. Remind You of Things 3
29. 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") => #<User id: 1, name: "James Edward Gray II", …> >> article = Article.new(subject: "First Post").tap { |a| a.user = jeg2; a.save! } => #<Article id: 1, user_id: 1, subject: "First Post", …> >> Comment.new(body: "I need to add this.").tap { |c| c.user, c.article = jeg2, article; c.save! } => #<Comment id: 1, user_id: 1, article_id: 1, body: "I need to add this.", …> >> [Article, Comment, User].map(&:count) => [1, 1, 1] >> exit $ rails r 'p [Article, Comment, User].map(&:count)' [0, 0, 0]
30. 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") => #<User id: 1, name: "James Edward Gray II", …> >> article = Article.new(subject: "First Post").tap { |a| a.user = jeg2; a.save! } => #<Article id: 1, user_id: 1, subject: "First Post", …> >> Comment.new(body: "I need to add this.").tap { |c| c.user, c.article = jeg2, article; c.save! } => #<Comment id: 1, user_id: 1, article_id: 1, body: "I need to add this.", …> >> [Article, Comment, User].map(&:count) => [1, 1, 1] >> exit $ rails r 'p [Article, Comment, User].map(&:count)' [0, 0, 0]
31. 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") => #<User id: 1, name: "James Edward Gray II", …> >> article = Article.new(subject: "First Post").tap { |a| a.user = jeg2; a.save! } => #<Article id: 1, user_id: 1, subject: "First Post", …> >> Comment.new(body: "I need to add this.").tap { |c| c.user, c.article = jeg2, article; c.save! } => #<Comment id: 1, user_id: 1, article_id: 1, body: "I need to add this.", …> >> [Article, Comment, User].map(&:count) => [1, 1, 1] >> exit $ rails r 'p [Article, Comment, User].map(&:count)' [0, 0, 0]
32. 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") => #<User id: 1, name: "James Edward Gray II", …> >> article = Article.new(subject: "First Post").tap { |a| a.user = jeg2; a.save! } => #<Article id: 1, user_id: 1, subject: "First Post", …> >> Comment.new(body: "I need to add this.").tap { |c| c.user, c.article = jeg2, article; c.save! } => #<Comment id: 1, user_id: 1, article_id: 1, body: "I need to add this.", …> >> [Article, Comment, User].map(&:count) => [1, 1, 1] >> exit $ rails r 'p [Article, Comment, User].map(&:count)' [0, 0, 0]
33. 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") => #<User id: 1, name: "James Edward Gray II", …> >> article = Article.new(subject: "First Post").tap { |a| a.user = jeg2; a.save! } => #<Article id: 1, user_id: 1, subject: "First Post", …> >> Comment.new(body: "I need to add this.").tap { |c| c.user, c.article = jeg2, article; c.save! } => #<Comment id: 1, user_id: 1, article_id: 1, body: "I need to add this.", …> >> [Article, Comment, User].map(&:count) => [1, 1, 1] >> exit $ rails r 'p [Article, Comment, User].map(&:count)' [0, 0, 0]
34. 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"
35. 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"
36. 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
37. 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
38. 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
39. 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
40. 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
41. 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
42. 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
43. Keep You Entertained 8
44. Keep You Entertained 8
45. The Database A place to store all that drama
46. Understand Shorthand Migrations $ rails g resource user name:string email:string token:string bio:text 9 From José Valim
47. 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
48. 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
49. 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
50. 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
51. Add Indexes to Migrations $ rails g resource user name:index email:uniq token:string{6} bio:text 10 From José Valim
52. 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
53. 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
54. 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
55. Add Associations to a Migration $ rails g resource article user:references subject body:text 11 From José Valim
56. 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
57. 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
58. 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
59. 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
60. 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
61. 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
62. 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
63. 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
64. Import Your CSV Data 13 Name,Email James,james@example.com Dana,dana@example.com Summer,summer@example.com 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
65. Import Your CSV Data 13 Name,Email James,james@example.com Dana,dana@example.com Summer,summer@example.com 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
66. Import Your CSV Data 13 Name,Email James,james@example.com Dana,dana@example.com Summer,summer@example.com 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
67. 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
68. 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
69. 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 id: 1, …> >> 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
70. 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 id: 1, …> >> 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
71. 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 id: 1, …> >> 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
72. “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" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.pluck(:email) (0.2ms) SELECT email FROM "users" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.uniq.pluck(:email) (0.2ms) SELECT DISTINCT email FROM "users" => ["dana@example.com", "james@example.com", "summer@example.com"]
73. “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" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.pluck(:email) (0.2ms) SELECT email FROM "users" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.uniq.pluck(:email) (0.2ms) SELECT DISTINCT email FROM "users" => ["dana@example.com", "james@example.com", "summer@example.com"]
74. “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" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.pluck(:email) (0.2ms) SELECT email FROM "users" => ["james@example.com", "dana@example.com", "summer@example.com"] >> User.uniq.pluck(:email) (0.2ms) SELECT DISTINCT email FROM "users" => ["dana@example.com", "james@example.com", "summer@example.com"]
75. Count Records in Groups 16 $ rails g resource event article:belongs_to trigger
76. 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 => #<Article id: 1, …> >> {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}
77. 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 => #<Article id: 1, …> >> {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}
78. 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 => #<Article id: 1, …> >> {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}
79. 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
80. 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
81. Instantiate Records Without a Database 18 $ rails c Loading development environment (Rails 3.2.3) >> User.find(1) => #<User id: 1, name: "James", email: "james@example.com", …> >> jeg2 = User.instantiate("id" => 1, "email" => "james@example.com") => #<User id: 1, email: "james@example.com"> >> jeg2.name = "James Edward Gray II" => "James Edward Gray II" >> jeg2.save! => true >> User.find(1) => #<User id: 1, name: "James Edward Gray II", email: "james@example.com", …>
82. Instantiate Records Without a Database 18 $ rails c Loading development environment (Rails 3.2.3) >> User.find(1) => #<User id: 1, name: "James", email: "james@example.com", …> >> jeg2 = User.instantiate("id" => 1, "email" => "james@example.com") => #<User id: 1, email: "james@example.com"> >> jeg2.name = "James Edward Gray II" => "James Edward Gray II" >> jeg2.save! => true >> User.find(1) => #<User id: 1, name: "James Edward Gray II", email: "james@example.com", …>
83. Instantiate Records Without a Database 18 $ rails c Loading development environment (Rails 3.2.3) >> User.find(1) => #<User id: 1, name: "James", email: "james@example.com", …> >> jeg2 = User.instantiate("id" => 1, "email" => "james@example.com") => #<User id: 1, email: "james@example.com"> >> jeg2.name = "James Edward Gray II" => "James Edward Gray II" >> jeg2.save! => true >> User.find(1) => #<User id: 1, name: "James Edward Gray II", email: "james@example.com", …>
84. 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
85. 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 id: 1, bio: "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XX...", created_at: "2012-04-14 23:02:08", updated_at: "2012-04-14 23:02:08"> >> User.last.bio.size => 10000
86. 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 id: 1, bio: "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XX...", created_at: "2012-04-14 23:02:08", updated_at: "2012-04-14 23:02:08"> >> User.last.bio.size => 10000
87. Use Full Text Search in PostgreSQL 20 $ rails g resource article subject body:text From PeepCode
88. 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
89. 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
90. 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
91. 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
92. 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
93. 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
94. 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 id: 1, …> >> Article.create!(body: "A stemmed search.") => #<Article id: 2, …> >> Article.create!(body: "You won't find me!") => #<Article id: 3, …> >> 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."]
95. 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 id: 1, …> >> Article.create!(body: "A stemmed search.") => #<Article id: 2, …> >> Article.create!(body: "You won't find me!") => #<Article id: 3, …> >> 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."]
96. 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 id: 1, …> >> Article.create!(body: "A stemmed search.") => #<Article id: 2, …> >> Article.create!(body: "You won't find me!") => #<Article id: 3, …> >> 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."]
97. 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
98. 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
99. 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
100. 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"
101. 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
102. 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
103. 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) =========================
104. 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) =========================
105. 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) =========================
106. Use Different a Database for Each User 21 $ rails c >> connect_to_user_database("ruby_rogues") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "Chuck") => #<User id: 1, name: "Chuck", …> >> User.create!(name: "Josh") => #<User id: 2, name: "Josh", …> >> User.create!(name: "Avdi") => #<User id: 3, name: "Avdi", …> … >> connect_to_user_database("grays") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "James") => #<User id: 1, name: "James", …> >> User.create!(name: "Dana") => #<User id: 2, name: "Dana", …> >> User.create!(name: "Summer") => #<User id: 3, name: "Summer", …>
107. Use Different a Database for Each User 21 $ rails c >> connect_to_user_database("ruby_rogues") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "Chuck") => #<User id: 1, name: "Chuck", …> >> User.create!(name: "Josh") => #<User id: 2, name: "Josh", …> >> User.create!(name: "Avdi") => #<User id: 3, name: "Avdi", …> … >> connect_to_user_database("grays") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "James") => #<User id: 1, name: "James", …> >> User.create!(name: "Dana") => #<User id: 2, name: "Dana", …> >> User.create!(name: "Summer") => #<User id: 3, name: "Summer", …>
108. Use Different a Database for Each User 21 $ rails c >> connect_to_user_database("ruby_rogues") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "Chuck") => #<User id: 1, name: "Chuck", …> >> User.create!(name: "Josh") => #<User id: 2, name: "Josh", …> >> User.create!(name: "Avdi") => #<User id: 3, name: "Avdi", …> … >> connect_to_user_database("grays") => #<ActiveRecord::ConnectionAdapters::ConnectionPool…> >> User.create!(name: "James") => #<User id: 1, name: "James", …> >> User.create!(name: "Dana") => #<User id: 2, name: "Dana", …> >> User.create!(name: "Summer") => #<User id: 3, name: "Summer", …>
109. 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
110. 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
111. Use Different a Database for Each User 21
112. Use Different a Database for Each User 21
113. Intermission Am I going to make it???
114. 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
115. Less Talk, More Tricks!!!
116. Refine Your Fashion Sense http://www.flickr.com/photos/oreillyconf/5735037920/ 22
117. Refine Your Fashion Sense http://www.flickr.com/photos/oreillyconf/5735037920/ http://www.flickr.com/photos/oreillyconf/5735038376/ 22
118. 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
119. Ruby Extensions Updating Ruby’s fashion sense
120. 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
121. 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
122. 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.
123. 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.
124. 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}}
125. 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}}
126. 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"}
127. 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"}
128. 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}
129. 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}
130. 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}
131. 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}
132. Answer Questions About Strings 27 $ rails g migration add_status_to_articles status
133. 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
134. 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
135. 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 id: 1, …, status: "Draft"> >> article.draft? => true >> article.published? => false
136. 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 id: 1, …, status: "Draft"> >> article.draft? => true >> article.published? => false
137. 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 id: 1, …, status: "Draft"> >> article.draft? => true >> article.published? => false
138. 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 id: 1, …, status: "Draft"> >> article.draft? => true >> article.published? => false
139. 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
140. 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
141. 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
142. 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
143. Get you voted “Hottest Hacker” http://pageman.multiply.com/links/item/21/David_Heinemeier_Hanssons_Blog 29
144. Get you voted “Hottest Hacker” http://pageman.multiply.com/links/item/21/David_Heinemeier_Hanssons_Blog 29
145. 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
146. Views It’s all about how we look
147. Hide Comments From Your Users 30 <!-- HTML comments stay in the rendered content --> <%# ERb comments do not %> <h1>Home Page</h1> From The Rails View
148. Hide Comments From Your Users 30 <!-- HTML comments stay in the rendered content --> <%# ERb comments do not %> <h1>Home Page</h1> From The Rails View
149. Hide Comments From Your Users 30 <!-- HTML comments stay in the rendered content --> <%# ERb comments do not %> <h1>Home Page</h1> <body> <!-- HTML comments stay in the rendered content --> <h1>Home Page</h1> </body> From The Rails View
150. 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
151. 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
152. 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
153. 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
154. Use Blocks to Avoid Assignments in Views 32 <table> <% @cart.products.each do |product| %> <tr> <td><%= product.name %></td> <td><%= number_to_currency product.price %></td> </tr> <% end %> <tr> <td>Subtotal</td> <td><%= number_to_currency @cart.total %></td> </tr> <tr> <td>Tax</td> <td><%= number_to_currency(tax = calculate_tax(@cart.total)) %></td> </tr> <tr> <td>Total</td> <td><%= number_to_currency(@cart.total + tax) %></td> </tr> </table> From The Rails View
155. Use Blocks to Avoid Assignments in Views 32 <table> <% @cart.products.each do |product| %> <tr> <td><%= product.name %></td> <td><%= number_to_currency product.price %></td> </tr> <% end %> <tr> <td>Subtotal</td> <td><%= number_to_currency @cart.total %></td> </tr> <tr> <td>Tax</td> <td><%= number_to_currency(tax = calculate_tax(@cart.total)) %></td> </tr> <tr> <td>Total</td> <td><%= number_to_currency(@cart.total + tax) %></td> </tr> </table> From The Rails View
156. Use Blocks to Avoid Assignments in Views 32 <table> <% @cart.products.each do |product| %> <tr> <td><%= product.name %></td> <td><%= number_to_currency product.price %></td> </tr> <% end %> <tr> <td>Subtotal</td> <td><%= number_to_currency @cart.total %></td> </tr> <tr> <td>Tax</td> <td><%= number_to_currency(tax = calculate_tax(@cart.total)) %></td> </tr> <tr> <td>Total</td> <td><%= number_to_currency(@cart.total + tax) %></td> </tr> </table> From The Rails View
157. <table> <% @cart.products.each do |product| %> <tr> <td><%= product.name %></td> <td><%= number_to_currency product.price %></td> </tr> <% end %> <tr> <td>Subtotal</td> <td><%= number_to_currency @cart.total %></td> </tr> <% calculate_tax @cart.total do |tax| %> <tr> <td>Tax</td> <td><%= number_to_currency tax %></td> </tr> <tr> <td>Total</td> <td><%= number_to_currency(@cart.total + tax) %></td> </tr> <% end %> </table> Use Blocks to Avoid Assignments in Views 32 From The Rails View
158. <table> <% @cart.products.each do |product| %> <tr> <td><%= product.name %></td> <td><%= number_to_currency product.price %></td> </tr> <% end %> <tr> <td>Subtotal</td> <td><%= number_to_currency @cart.total %></td> </tr> <% calculate_tax @cart.total do |tax| %> <tr> <td>Tax</td> <td><%= number_to_currency tax %></td> </tr> <tr> <td>Total</td> <td><%= number_to_currency(@cart.total + tax) %></td> </tr> <% end %> </table> Use Blocks to Avoid Assignments in Views 32 From The Rails View
159. 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
160. 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
161. Generate Multiple Tags at Once 33 From José Valim <h1>Articles</h1> <% @articles.each do |article| %> <%= content_tag_for(:div, article) do %> <h2><%= article.subject %></h2> <% end %> <% end %>
162. Generate Multiple Tags at Once 33 From José Valim <h1>Articles</h1> <% @articles.each do |article| %> <%= content_tag_for(:div, article) do %> <h2><%= article.subject %></h2> <% end %> <% end %>
163. Generate Multiple Tags at Once 33 From José Valim <h1>Articles</h1> <% @articles.each do |article| %> <%= content_tag_for(:div, article) do %> <h2><%= article.subject %></h2> <% end %> <% end %> <h1>Articles</h1> <%= content_tag_for(:div, @articles) do |article| %> <h2><%= article.subject %></h2> <% end %>
164. Generate Multiple Tags at Once 33 From José Valim <h1>Articles</h1> <% @articles.each do |article| %> <%= content_tag_for(:div, article) do %> <h2><%= article.subject %></h2> <% end %> <% end %> <h1>Articles</h1> <%= content_tag_for(:div, @articles) do |article| %> <h2><%= article.subject %></h2> <% end %>
165. Render Any Object 34 From José Valim class Event < ActiveRecord::Base # ... def to_partial_path "events/#{trigger}" # events/edit or events/view end end
166. 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 %>
167. 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 %>
168. 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 %>
169. Group Menu Entries 35 From The Rails View
170. 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] ) ) %>
171. 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] ) ) %>
172. 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>labeled_)? (?<wrapped>\w+?) (?<with_errors>_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
173. 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>labeled_)? (?<wrapped>\w+?) (?<with_errors>_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
174. 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>labeled_)? (?<wrapped>\w+?) (?<with_errors>_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
175. 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>labeled_)? (?<wrapped>\w+?) (?<with_errors>_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
176. 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
177. 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
178. 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
179. Build Forms the Way You Like Them 36 From The Rails View <%= form_for @article do |f| %> <p><%= f.text_field :subject %></p> <p><%= f.labeled_text_field :subject %></p> <p><%= f.text_field_with_errors :subject %></p> <p><%= f.labeled_text_field_with_errors :subject %></p> <%= f.submit %> <% end %>
180. Build Forms the Way You Like Them 36 From The Rails View <%= form_for @article do |f| %> <p><%= f.text_field :subject %></p> <p><%= f.labeled_text_field :subject %></p> <p><%= f.text_field_with_errors :subject %></p> <p><%= f.labeled_text_field_with_errors :subject %></p> <%= f.submit %> <% end %>
181. Build Forms the Way You Like Them 36 From The Rails View <!-- ... --> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <!-- ... -->
182. Build Forms the Way You Like Them 36 From The Rails View <!-- ... --> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <!-- ... -->
183. Build Forms the Way You Like Them 36 From The Rails View <!-- ... --> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p> <p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <p><label for="article_subject">Subject</label> <input id="article_subject" name="article[subject]" size="30" type="text" value="" /> <span class="error">can't be blank</span></p> <!-- ... -->
184. Inspire Theme Songs About Your Work http://www.confreaks.com/videos/529-farmhouseconf-ruby-hero-tenderlove 37
185. The Router and Controllers They carry the theme of our applications
186. Route Exceptions From José Valim 38 # ... module Blog class Application < Rails::Application # ... config.exceptions_app = routes end end
187. Route Exceptions From José Valim 38 # ... module Blog class Application < Rails::Application # ... config.exceptions_app = routes end end
188. 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
189. 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
190. Route to Sinatra From Crafting Rails Applications 39 source 'https://rubygems.org' # ... gem "resque", require: "resque/server"
191. Route to Sinatra From Crafting Rails Applications 39 source 'https://rubygems.org' # ... gem "resque", require: "resque/server"
192. 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
193. 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
194. 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
195. 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
196. 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
197. 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
198. 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
199. 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
200. 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
201. 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
202. 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
203. 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
204. 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
205. Do Some Work in the Background From Crafting Rails Applications 41 $ rails g migration add_stats_to_articles stats:text
206. Do Some Work in the Background From Crafting Rails Applications 41 $ rails g migration add_stats_to_articles stats:text
207. 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
208. 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
209. 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
210. 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
211. 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
212. 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
213. 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
214. 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
215. 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
216. 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"]
217. 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"]
218. 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"]
219. Have We All Learned Something New Yet?!
220. 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
221. 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
222. 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
223. 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
224. 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
225. 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
226. 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(/<a[^>]+href="([^"]+)"/) do |link| paths << link.first end end # ... end end
227. 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(/<a[^>]+href="([^"]+)"/) do |link| paths << link.first end end # ... end end
228. 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
229. 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
230. Publish a Static Site Using Rails 42 $ rake static:generate RSYNC_SITE_TO=/Users/james/Desktop
231. Publish a Static Site Using Rails 42 $ rake static:generate RSYNC_SITE_TO=/Users/james/Desktop
232. Did you memorize that?!
233. Did you memorize that?! Slides: http://speakerdeck.com/u/jeg2 Twitter: @JEG2 Email: james@graysoftinc.com
234. Thanks! Have fun using these Rails tricks