Agile Web Development with Rails, Edition 4

12.5 Playtime 12.2 Iteration G2: Atom Feeds

12.4 Iteration G2: Downloading an eBook

demonstrate streaming with ActionController::Live

Switch to puma as a server

edit Gemfile
gem 'puma'

Restart the server.

add a route for downloading a product

edit config/routes.rb
Rails.application.routes.draw do
  resources :orders
  resources :line_items
  resources :carts
  get 'store/index'
 
  resources :products do
    get :download, :on => :member
    get :who_bought, on: :member
  end
 
  # The priority is based upon order of creation:
  # first created -> highest priority.
  # See how all your routes lay out with "rake routes".
 
  # You can have the root of your site routed with "root"
  root 'store#index', as: 'store'
 
  # Example of regular route:
  #   get 'products/:id' => 'catalog#view'
 
  # Example of named route that can be invoked with purchase_url(id: product.id)
  #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase
 
  # Example resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products
 
  # Example resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end
 
  # Example resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end
 
  # Example resource route with more complex sub-resources:
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', on: :collection
  #     end
  #   end
 
  # Example resource route with concerns:
  #   concern :toggleable do
  #     post 'toggle'
  #   end
  #   resources :posts, concerns: :toggleable
  #   resources :photos, concerns: :toggleable
 
  # Example resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end
end

mock streaming implementation for download

edit app/controllers/products_controller.rb
  include ActionController::Live
  def download
    response.headers['Content-Type'] = 'text/plain'
    40.times do |i|
      response.stream.write "Line #{i}\n\n"
      sleep 0.10
    end
    response.stream.write "Fini.\n"
  ensure
    response.stream.close
  end

add order to the session

edit app/controllers/orders_controller.rb
  def create
    @order = Order.new(order_params)
    @order.add_line_items_from_cart(@cart)
 
    respond_to do |format|
      if @order.save
        Cart.destroy(session[:cart_id])
        session[:cart_id] = nil
        session[:order_id] = @order.id
        format.html { redirect_to store_index_url, notice: 
          'Thank you for your order.' }
        format.json { render :show, status: :created,
          location: @order }
      else
        format.html { render :new }
        format.json { render json: @order.errors,
          status: :unprocessable_entity }
      end
    end
  end

render order in the side bar

edit app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
  <head>
    <title>Pragprog Books Online Store</title>
    <%= csrf_meta_tags %>
 
    <%= csrf_meta_tags %>
 
    <%= stylesheet_link_tag    'application', media: 'all',
    'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
  </head>
 
  <body class="<%= controller.controller_name %>">
    <div id="banner">
      <%= image_tag 'logo.svg', alt: 'The Pragmatic Bookshelf' %>
      <span class="title"><%= @page_title %></span>
    </div>
    <div id="columns">
      <div id="side">
        <% if @cart %>
          <%= hidden_div_if(@cart.line_items.empty?, id: 'cart') do %>
            <%= render @cart %>
          <% end %>
        <% end %>
 
      <%= render Order.find(session[:order_id]) if session[:order_id] -%>
 
        <ul>
          <li><a href="http://www....">Home</a></li>
          <li><a href="http://www..../faq">Questions</a></li>
          <li><a href="http://www..../news">News</a></li>
          <li><a href="http://www..../contact">Contact</a></li>
        </ul>
      </div>
      <div id="main">
        <%= yield %>
      </div>
    </div>
  </body>
</html>

implement order partial

edit app/views/orders/_order.html.erb
<div id="order">
<h2>Your Downloads</h2>
<table data-no-turbolink>
  <% order.line_items.each do |item| %>
  <tr>
    <td><%= link_to item.product.title, download_product_path(item.product) %></td>
  </tr>
  <% end %>
</table>
</div>

css tweaks

edit app/assets/stylesheets/application.css.scss
  #side {
    padding: 1em 2em;
    background: #141;
 
    form, div {
      display: inline;
    }  
 
    input {
      font-size: small;
    }
 
    #cart, #order {
      font-size: smaller;
      color:     white;
 
      a, a:hover {
        color: white;
        background-color: #141;
      }
 
      table {
        border-top:    1px dotted #595;
        border-bottom: 1px dotted #595;
        margin-bottom: 10px;
      }
    }
 
    ul {
      padding: 0;
 
      li {
        list-style: none;
 
        a {
          color: #bfb;
          font-size: small;
        }
      }
    }
  }

place an order

get /

Your Pragmatic Catalog

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Rails, Angular, Postgres, and Bootstrap

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Ruby Performance Optimization

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Seven Mobile Apps in Seven Weeks

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$26.00 
post /line_items?product_id=2
You are being redirected. 
get http://localhost:3000/store/index

Your Cart

1× Rails, Angular, Postgres, and Bootstrap $45.00
Total $45.00

Your Pragmatic Catalog

Dcbang

Rails, Angular, Postgres, and Bootstrap

Powerful, Effective, and Efficient Full-Stack Web Development As a Rails developer, you care about user experience and performance, but you also want simple and maintainable code. Achieve all that by embracing the full stack of web development, from styling with Bootstrap, building an interactive user interface with AngularJS, to storing data quickly and reliably in PostgreSQL. Take a holistic view of full-stack development to create usable, high-performing applications, and learn to use these technologies effectively in a Ruby on Rails environment.

$45.00
Adrpo

Ruby Performance Optimization

Why Ruby Is Slow, and How to Fix It You don’t have to accept slow Ruby or Rails performance. In this comprehensive guide to Ruby optimization, you’ll learn how to write faster Ruby code—but that’s just the beginning. See exactly what makes Ruby and Rails code slow, and how to fix it. Alex Dymo will guide you through perils of memory and CPU optimization, profiling, measuring, performance testing, garbage collection, and tuning. You’ll find that all those “hard” things aren’t so difficult after all, and your code will run orders of magnitude faster.

$46.00
7apps

Seven Mobile Apps in Seven Weeks

Native Apps, Multiple Platforms Answer the question “Can we build this for ALL the devices?” with a resounding YES. This book will help you get there with a real-world introduction to seven platforms, whether you’re new to mobile or an experienced developer needing to expand your options. Plus, you’ll find out which cross-platform solution makes the most sense for your needs.

$26.00 
get /orders/new

Your Cart

1× Rails, Angular, Postgres, and Bootstrap $45.00
Total $45.00
Please Enter Your Details 




post /orders
You are being redirected. 
get http://localhost:3000/store/index

Thank you for your order.

Your Pragmatic Catalog

Dcbang

Rails, Angular, Postgres, and Bootstrap

Powerful, Effective, and Efficient Full-Stack Web Development As a Rails developer, you care about user experience and performance, but you also want simple and maintainable code. Achieve all that by embracing the full stack of web development, from styling with Bootstrap, building an interactive user interface with AngularJS, to storing data quickly and reliably in PostgreSQL. Take a holistic view of full-stack development to create usable, high-performing applications, and learn to use these technologies effectively in a Ruby on Rails environment.

$45.00
Adrpo

Ruby Performance Optimization

Why Ruby Is Slow, and How to Fix It You don’t have to accept slow Ruby or Rails performance. In this comprehensive guide to Ruby optimization, you’ll learn how to write faster Ruby code—but that’s just the beginning. See exactly what makes Ruby and Rails code slow, and how to fix it. Alex Dymo will guide you through perils of memory and CPU optimization, profiling, measuring, performance testing, garbage collection, and tuning. You’ll find that all those “hard” things aren’t so difficult after all, and your code will run orders of magnitude faster.

$46.00
7apps

Seven Mobile Apps in Seven Weeks

Native Apps, Multiple Platforms Answer the question “Can we build this for ALL the devices?” with a resounding YES. This book will help you get there with a real-world introduction to seven platforms, whether you’re new to mobile or an experienced developer needing to expand your options. Plus, you’ll find out which cross-platform solution makes the most sense for your needs.

$26.00

click download

get /products/2/download
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Fini.

    

    
Switch back to WEBRick

    
edit Gemfile

    
# gem 'puma'

    
Restart the server.

    
make sure that nothing is broken

    
rake test

    
Run options: --seed 49385

    
 

    
# Running:

    
 

    
.......................................

    
 

    
Finished in 0.554797s, 70.2960 runs/s, 169.4314 assertions/s.

    
 

    
39 runs, 94 assertions, 0 failures, 0 errors, 0 skips

    

      12.5 Playtime
      12.2 Iteration G2: Atom Feeds