Pourquoi Ruby on Rails ça déchire ?
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Simon Courtois - @happynoff www.tinci.fr Ruby on Rails Why does it rock?
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Présentation accompagnant mon talk du Meetup Paris.rb du 10 janvier 2012.
Transcript of Pourquoi Ruby on Rails ça déchire ?
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Web Development
Software Development
X_
Consulting & Support
@tincihq
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Active Recordarticles
id title body
1 hello world This is a body
# app/models/article.rb class Article < ActiveRecord::Base end !article = Article.first !article.title #=> "hello world"
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Active Recordarticles
id title body published
1 hello world This is a body 1
2 other art. Not published 0
articles = Article.where(published: 1) !articles.count #=> 1
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Active Recordarticles
id title body author_id
1 ... ... 1
authors
id name
1 John Doe
# app/models/article.rb class Article < ActiveRec... belongs_to :author end !# app/models/author.rb class Author < ActiveRec... has_many :articles end !article = Article.first !article.author.name #=> “John Doe”
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Routing# app/controller/hello_controller.rb class HelloController < ApplicationController def index @name = params[:name] end end
http://example.com/hello/John
# config/routes.rb get "hello/:name" => "hello#index"
URL
HTTP verbcontroller
controller’s action
parameter
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Views# app/controller/hello_controller.rb class HelloController < ApplicationController def index @name = params[:name] end end
# app/views/hello/index.html.erb Hello <%= @name %>
Conventions !
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Helpers
# app/views/articles/index.html.erb <%= @articles.each do |article| %> <p><%= link_to article.title, article %></p> <% end %>
# app/controller/articles_controller.rb class ArticlesController < ApplicationController def index @articles = Article.all end end
<p><a href="/articles/1">hello world</a></p>
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Helpers# app/controller/articles_controller.rb class ArticlesController < ApplicationController def new @article = Article.new end end
<%= form_for @article do |f| %> <p><%= f.label :title, "Title" %><br /> <%= f.text_field :title %></p> ! <p><%= f.label :body, "Body" %><br /> <%= f.text_area :body %></p> ! <p><%= f.submit %></p> <% end %>
Title
Body
Create Article
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Railties
$ rake routesGET /hello/:name { :controller => "hello", :action => "index" }
$ rails serverStarts a web server listening on http://localhost:3000/
$ rails consoleStarts an interactive console in the application context >> Article.first.title! #=> "hello world"
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Generators
$ rails generate model author name:stringinvoke active_record create db/migrate/20120108151543_create_authors.rb create app/models/author.rb
instructions to create the authors table
the Author model
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Generators
$ rails g scaffold author name:stringcreate db/migrate/20120108152723_create_authors.rb create app/models/author.rb !route resources :authors !create app/controllers/authors_controller.rb !create app/views/authors/index.html.erb create app/views/authors/edit.html.erb create app/views/authors/show.html.erb create app/views/authors/new.html.erb create app/views/authors/_form.html.erb !create public/stylesheets/scaffold.css
modelroutes
controller
views
default CSS
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Generators# config/routes.rb resources :authors
authors GET /authors { action: index controller: authors } author GET /authors/:id { action: show controller: authors } new_author GET /authors/new { action: new controller: authors } POST /authors { action: create controller: authors } edit_author GET /authors/:id/edit { action: edit controller: authors } PATCH /authors/:id { action: update controller: authors } PUT /authors/:id { action: update controller: authors } DELETE /authors/:id { action: destroy controller: authors }
<%= link_to "All authors", authors_path %><%= link_to "Edit", edit_author_path(@author) %>
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ActiveSupport little additions
1.kilobytes! #=> 1024!!!3.days.ago!! #=> Tue, 24 Jun 2014 09:44:47 UTC +00:00!!!"héhé test".parameterize! #=> "hehe-test"!!!“article”.pluralize!! ! ! #=> "articles"
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Views and forms<%= form_for @article do |f| %> <p><%= f.label :title, "Title" %><br /> <%= f.text_field :title %></p> ! <p><%= f.label :body, "Body" %><br /> <%= f.text_area :body %></p> ! <p><%= f.submit %></p> <% end %>
= simple_form_for @article do |f| = f.input :title = f.input :body = f.submit
slim + simple_form
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And many more
MongoidKaminari
Carrierwave
Active Admin
MongoDB
Pagination
File upload
Administration interface
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Who is using Rails?
BasecampGithub
GrouponUS Yellow Pages
Shopify
http://rubyonrails.org/applications
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Resources
rubyonrails.org Official website
tutorials.jumpstartlab.com/topics Very complete tutorial
railsforzombies.org Interactive tutorial
railstutorial.org/book Free online book
#rubyonrails.fr French IRC channel
