Riding Rails 4

An overview of some of the new features in Rails 4. All features are discussed in depth in the e-book Upgrade to Rails 4 (http://www.leanpub.com/upgradetorails4) as well.

Transcript

1. RIDING RAILS 4
2. #BCNONRAILS4
3. PHILIP DE SMEDT @PHILIPDESMEDT PHILIPDESMEDT.COM
4. FULL-STACK DEVELOPER FREELANCE (HIRE ME)  
5. I WROTE A BOOK UPGRADE TO RAILS 4  
6. WHO HAS TRIED RAILS 4? gem install rails --version 4.0.0.beta1 --no-ri --no-rdoc
7. TURBOLINKS
8. LISTENS TO CLICK EVENTS
9. LISTENS TO CLICK EVENTS LOADS CONTENT WITHOUT RELOADING THE PAGE
10. LISTENS TO CLICK EVENTS LOADS CONTENT WITHOUT RELOADING THE PAGE REPLACES BODY+TITLE USING HTML5 pushState
11. DEMO
12. RUSSIAN DOLL CACHING
13. class  Post  <  Ac+veRecord::Base      has_many  :categories   end     class  Category  <  Ac+veRecord::Base      belongs_to  :post,  touch:  true   end   LET’S CACHE  
14. <!-- app/views/posts/show.html.erb --> <% cache [‘v1’, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %> RAILS 3  
15. RAILS 3   <!-- app/views/categories/_category.html.erb --> <% cache [‘v1’, category] do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li> <% end %>
16. views/v1/posts/ 1-20130228151844 RAILS 3 CACHE KEYS  
17. RAILS 3   <!-- app/views/categories/_category.html.erb --> <% cache [‘ v2’, category] do %> <li> <%= category.title %> <%= link_to “ RENAME”, category %> </li> <% end %>
18. <!-- app/views/posts/show.html.erb --> <% cache [‘ v2’, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %> RAILS 3  
20. <!-- app/views/categories/_category.html.erb --> <% cache category do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li> <% end %> <!-- app/views/posts/show.html.erb --> <% cache @post do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %>
21. views/posts/ 1-20130228151844/ fbda9857614e68ed1df453 559a761d47 RAILS 4 CACHE DIGEST  
22. STRONG PARAMETERS
23. class User < ActiveRecord::Base attr_accessible :name, :email end def create @user = User.new(params[:user]) @user.save end RAILS 3  
24. EXAMPLE
25. class CarsController < ApplicationController def create @car = Car.new(car_params) if @car.save redirect_to @car else render ‘new’ end end end RAILS 4  
26. private def car_params params.require(:car).permit(:name, :year, :brand) end require(key) - Ensures that a parameter is present. If it’s present, returns the parameter at the given key, otherwise raises an ActionController:: ParameterMissing error. permit(filters) - Returns a new ActionController::Parameters instance that includes only the given filters and sets the permitted attribute for the object to true. This is useful for limiting which attributes should be allowed for mass updating.
27. LIVE STREAMING
28. ACTIONCONTROLLER::LIVE MIXIN I/O OBJECT   STREAM DATA TO CLIENT  
29. DON’T USE WEBrick USE PUMA OR RAINBOWS!
30. RUNS IN SEPARATE THREAD
31. CLOSE YOUR STREAM WHEN DONE
32. PUMA vs. RAINBOWS! vs. NODE.JS RUBYSNIPPETS.COM  
34. DEMO
35. ACTIVEMODEL::MODEL
36. FORM WITHOUT ACTIVE RECORD. WTF?
37. FORM_TAG HELPER CREATE MODEL
38. EXAMPLE
39. class Contact include ActiveModel::Model attr_accessor :name, :email, :message validates :name, presence: true validates :email, presence: true validates :message, presence: true, length: { maximum: 300 } end contact = Contact.new(name: 'John Doe', email: 'john@doe.com', message: 'a test')
40. <h1>Contact Us</h1> <%= form_for @contact do |f| %> <%= f.label :name %> <%= f.text_field :name %> <%= f.label :email %> <%= f.email_field :email %> <%= f.label :message %> <%= f.text_area :message %> <%= f.submit 'Submit' %> <% end %>
41. class ContactsController < ApplicationController def new @contact = Contact.new end def create @contact = Contact.new(params[:contact]) if @contact.valid? UserMailer.new_contact(@contact).deliver redirect_to root_path, notice: "Message sent! Thanks.” else render :new end end end
42. LOTS OF OTHER STUFF CONTROLLER-WIDE E-TAGS   THREAD SAFETY   ENCRYPTED COOKIES   ROUTING CONCERNS   HTTP PATCH VERB   CUSTOM FLASH TYPES   HTML5 FORM HELPERS   SCHEMA CACHE DUMP   NO MORE OBSERVERS/SWEEPERS   INDEX PAGE CONTROLLER   ACTIVE RESOURCE   PAGE/ACTION CACHING  
43. EDUCATION IS BROKEN. I’LL BE TEACHING RAILS… I <3 DEVBOOTCAMP/STARTER LEAGUE/… IN BARCELONA.
44. PHILIP DE SMEDT @PHILIPDESMEDT PHILIPDESMEDT.COM COME SAY HI LEANPUB.COM/UPGRADETORAILS4