Riding Rails 4
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The document discusses the features and updates in Rails 4, including caching techniques, strong parameters, live streaming, and form handling without Active Record. It provides code snippets for different functionalities such as caching posts and categories, creating and permitting parameters, and form validations. Additionally, it features insights on Rails 4 development and mentions the author's involvement in teaching Rails in Barcelona.
![RAILS 3
<!-- app/views/posts/show.html.erb -->
<% cache [„v1‟, @post] do %>
<h1><%= @post.title %> categories:</h1>
<ul><%= render @post.categories %></ul>
<% end %>](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-14-320.jpg)
![RAILS 3
<!-- app/views/categories/_category.html.erb -->
<% cache [„v1‟, category] do %>
<li>
<%= category.title %>
<%= link_to “edit”, category %>
</li>
<% end %>](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-15-320.jpg)
![RAILS 3
<!-- app/views/categories/_category.html.erb -->
<% cache [„v2 ‟, category] do %>
<li>
<%= category.title %>
<%= link_to “RENAME”, category %>
</li>
<% end %>](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-17-320.jpg)
![RAILS 3
<!-- app/views/posts/show.html.erb -->
<% cache [„v2‟, @post] do %>
<h1><%= @post.title %> categories:</h1>
<ul><%= render @post.categories %></ul>
<% end %>](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-18-320.jpg)
![RAILS 3
class User < ActiveRecord::Base
attr_accessible :name, :email
end
def create
@user = User.new(params[:user])
@user.save
end](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-23-320.jpg)
![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](https://image.slidesharecdn.com/rails4-130418043222-phpapp02/85/Riding-Rails-4-41-320.jpg)
Riding Rails 4
- 2. #BCNONRAILS4
- 3. PHILIP DE SMEDT @PHILIPDESMEDT PHILIPDESMEDT.COM
- 4. FREELANCE FULL-STACK DEVELOPER (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. CLICK LISTENS TO 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 HTML5 USING pushState
- 11. DEMO
- 13. LET’S CACHE class Post < ActiveRecord::Base has_many :categories end class Category < ActiveRecord::Base belongs_to :post, touch: true end
- 14. RAILS 3 <!-- app/views/posts/show.html.erb --> <% cache [„v1‟, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %>
- 15. RAILS 3 <!-- app/views/categories/_category.html.erb --> <% cache [„v1‟, category] do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li> <% end %>
- 16. RAILS 3 CACHE KEYS views/v1/posts/1- 20130228151844
- 17. RAILS 3 <!-- app/views/categories/_category.html.erb --> <% cache [„v2 ‟, category] do %> <li> <%= category.title %> <%= link_to “RENAME”, category %> </li> <% end %>
- 18. RAILS 3 <!-- app/views/posts/show.html.erb --> <% cache [„v2‟, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %>
- 20. <!-- app/views/posts/show.html.erb --> <% cache @post do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul> <% end %> <!-- app/views/categories/_category.html.erb --> <% cache category do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li> <% end %>
- 21. RAILS 4 CACHE DIGEST views/posts/1- 20130228151844/fbda9857 614e68ed1df453559a761d4 7
- 23. RAILS 3 class User < ActiveRecord::Base attr_accessible :name, :email end def create @user = User.new(params[:user]) @user.save end
- 24. EXAMPLE
- 25. RAILS 4 class CarsController < ApplicationController def create @car = Car.new(car_params) if @car.save redirect_to @car else render „new‟ end end end
- 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!
- 31. CLOSE YOUR STREAM WHEN DONE
- 32. PUMA vs. RAINBOWS! vs. NODE.JS RUBYSNIPPETS.COM
- 34. DEMO
- 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 ROUTING CONCERNS THREAD SAFETY CONTROLLER-WIDE E-TAGS ENCRYPTED COOKIES HTTP PATCH VERB CUSTOM FLASH TYPES HTML5 FORM HELPERS SCHEMA CACHE DUMP PAGE/ACTION CACHING NO MORE OBSERVERS/SWEEPERS ACTIVE RESOURCE INDEX PAGE CONTROLLER
- 43. EDUCATION IS BROKEN. I’LL BE TEACHING RAILS… IN BARCELONA. I <3 DEVBOOTCAMP/STARTER LEAGUE/…
- 44. COME SAY HI PHILIP DE SMEDT @PHILIPDESMEDT PHILIPDESMEDT.COM LEANPUB.COM/UPGRADETORAILS4