WebcampZG - Rails 4

• MVC Web Framework
• Verzija 1.0 - prosinac 2005.
• “Convention over conﬁguration”, DRY
• Najbolji je
• 235.000 siteova
Ruby on Rails

Promjene
verzije commits ﬁles changed lines changed
1.2 - 2.0 1,989 1,106
61,774 +
38,554 -
2.3 - 3.0 10,000+ 2,334
131,438 +
106,109 -
3.0 - 3.1 6,818 1,522
74,115 +
62,646 -
3.2 - 4.0? 7,304 2,005
94,231 +
92,069 -

Pretpremijera
# Gemfile
# gem 'rails', '3.2.8'
gem 'rails', github: 'rails/rails'
$ bundle update

# app/models/user.rb
class User < ActiveRecord::Base
end
# app/controllers/users_controller.rb
class UsersController < ApplicationController
def update
# params = {user: {name: 'Nikola', age: 25}}
@user = User.find(params[:id])
@user = @user.update_attributes(params[:user])
redirect_to @user
end
end
Mass assignment

end
def update
# params = {user: {name: 'Nikola', admin: true}}
redirect_to @user
end
end
Mass assignment

end
def update
redirect_to @user
end
end
# @user.admin?
# => true
Mass assignment

attr_accessible :name
end
def update
redirect_to @user
end
end
# @user.admin?
# => false
Mass assignment

config.active_record.whitelist_attributes = false

end
def update
@user = @user.update_attributes(user_params)
redirect_to @user
end
private
def user_params
params.require(:user).permit(:name)
end
end
Strong parameters

params.require(:user).permit(:name, :email, :password)
Strong parameters

Strong parameters
POST /users
params = {username: ‘Budala’}

Strong parameters
POST /users
params = {username: ‘Budala’}
<= 400 Bad Request

Strong parameters
POST /users
params = {user: {name: ‘Nikola’, admin: true}}

Strong parameters
POST /users
params = {user: {name: ‘Nikola’, admin: true}}
<= 201 CREATED
User.find_by_name(‘Nikola’).admin?
=> false

def user_params
params.require(:user).permit(:name)
end
end
# app/controllers/admin/users_controller.rb
class Admin::UsersController < ApplicationController
def user_params
params.require(:user).permit(User.attribute_names)
end
end
Višestruke uloge

https://github.com/rails/strong_parameters
Dostupan već danas!

• delayed_job
• Resque
• Sidekiq
• ...
Background job - Prije

class ExpensiveOperation
def run
# ...
end
end
Rails.queue.push(ExpensiveOperation.new)
Background job - Sada

config.queue = :asynchronous
config.queue = :synchronous
config.queue = :resque
Podešavanje

config.action_mailer.async = true
Asinkroni ActionMailer

class MyController < ActionController::Base
def index
100.times {
response.stream.write "hello worldn"
}
response.stream.close
end
end
Streaming

include ActionController::Live
def index
100.times {
}
end
end
Streaming

def index
100.times {
}
end
end
Streaming
WEBrick

def index
100.times {
}
end
end
Streaming
WEBrick Unicorn

def index
100.times {
}
end
end
Streaming
WEBrick Unicorn
Rainbows
Puma
Thin

@user
Babuška caching
@project
@project
@task
@task
@task

<%# app/views/users/show.html.erb %>
<% cache [ 'v1', @user ] do %>
<h1> <%= @user.name %> </h1>
<%= render @user.projects %>
<% end %>
<%# app/views/projects/_project.html.erb %>
<% cache [ 'v1', project ] do %>
<%= project.description %>
<%= render project.tasks %>
<% end %>
<%# app/views/tasks/_task.html.erb %>
<% cache [ 'v1', task ] do %>
Todo: <%= task.content %>
<% end %>
Babuška caching

<h1> <%= @user.name %> </h1>
<p> Vaši projekti: </p>
<% end %>
<% end %>
<% end %>
Babuška caching

<h1> <%= @user.name %> </h1>
<% end %>
<% end %>
<% end %>
Babuška caching

<h1> <%= @user.name %> </h1>
<% end %>
<% end %>
Date: <%= task.date %>
<% end %>
Babuška caching

<% cache @user do %>
<h1> <%= @user.name %> </h1>
<% end %>
<% cache project do %>
<% end %>
<% cache task do %>
<% end %>
Sada

Čarolijom!
(+ koristi MD5 templatea i partiala
kao cache key)
Kako???

https://github.com/rails/cache_digests

BCX::Application.routes.draw do
resources :messages { resources :comments }
resources :forwards { resources :comments }
resources :uploads { resources :comments }
end
Prije

BCX::Application.routes.draw do
concern :commentable do
resources :comments
end
resources :messages, :forwards, :uploads, concerns: :commentable
end
Sada

https://github.com/rails/routing_concerns

User.first
User.last
Prvi koji?

User.first
User.last
Prvi koji?
Sortirani po id-u
SELECT "users".* FROM "users" ORDER BY id LIMIT 1

Koji svi?
User.all
Vraća ActiveRecord::Relation objekt

Koji svi?
User.all
Vraća ActiveRecord::Relation objekt
@users = User.all
@users = @users.where(name: params[:name]) if params[:name]
@users = @users.order(params[:sort_by]) if params[:sort_by]

Nikoji, eto koji
User.none
Null objekt koji se dalje može ulančavati

I još
User.(metoda)!
@users = User.all
Prije:

I još
User.(metoda)!
@users = User.all
Prije:
@users = User.all
@users.where!(name: params[:name]) if params[:name]
@users.order!(params[:sort_by]) if params[:sort_by]
Sada:

Zbogom
find(:all, :conditions => ...)

Zbogom
ActiveRecord:SessionStore

Zbogom
Rails::Plugin
• u /lib folder
• pretvori u gem

• Turbolinks
• Cached schema dump
• HTTP PATCH
• HTML5 helperi
• conﬁg.threadsafe!
Još STO stvari

• Rails 3.1 - gotov
• Rails 3.2 - neka deprecation upozorenja, podrška do 4.1
• Rails 4.0 - deprecation upozorenja
• Rails 4.1 - uklanjanje deprecated dijelova
Verzioniranje

http://edgeguides.rubyonrails.org/4_0_release_notes.html
Dodatna literatura

Rails 4.0 Mind map
Boston.rb - What to expect in Rails 4.0
EdgeRails.info Blog
https://github.com/rails/rails
Dodatna dodatna literatura

WebcampZG - Rails 4

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