11.2 Iteration F2: Creating an AJAX-Based Cart 10.4 Playtime
Refactor the cart view into partials, and reference the result from the layout.
Create a "partial" view, for just one line item
edit app/views/line_items/_line_item.html.erb
<tr>
<td><%= line_item.quantity %>×</td>
<td><%= line_item.product.title %></td>
<td class="item_price"><%= number_to_currency(line_item.total_price) %></td>
</tr>
Replace that portion of the view with a callout to the partial
edit app/views/carts/show.html.erb
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<h2>Your Cart</h2>
<table>
<%= render(@cart.line_items) %>
<tr class="total_line">
<td colspan="2">Total</td>
<td class="total_cell"><%= number_to_currency(@cart.total_price) %></td>
</tr>
</table>
<%= button_to 'Empty cart', @cart, method: :delete,
data: { confirm: 'Are you sure?' } %>
Make a copy as a partial for the cart controller
cp app/views/carts/show.html.erb app/views/carts/_cart.html.erb
Modify the copy to reference the (sub)partial and take input from @cart
edit app/views/carts/_cart.html.erb
<h2>Your Cart</h2>
<table>
<%= render(cart.line_items) %>
<tr class="total_line">
<td colspan="2">Total</td>
<td class="total_cell"><%= number_to_currency(cart.total_price) %></td>
</tr>
</table>
<%= button_to 'Empty cart', cart, method: :delete,
data: { confirm: 'Are you sure?' } %>
Keep things DRY
edit app/views/carts/show.html.erb
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<%= render @cart %>
Reference the partial from the layout.
edit app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>Pragprog Books Online Store</title>
<%= stylesheet_link_tag "depot", media: "all",
"data-turbolinks-track" => true %>
<%= javascript_include_tag "depot", "data-turbolinks-track" => true %>
<%= csrf_meta_tag %>
</head>
<body class="<%= controller.controller_name %>">
<div id="banner">
<%= image_tag("logo.png") %>
<%= @page_title || "Pragmatic Bookshelf" %>
</div>
<div id="columns">
<div id="side">
<div id="cart">
<%= render @cart %>
</div>
<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>
Insert a call in the controller to find the cart
edit app/controllers/store_controller.rb
class StoreController < ApplicationController
before_filter :set_cart
def index
@products = Product.order(:title)
end
end
Add a small bit of style.
edit public/stylesheets/depot.css
/* Styles for the cart in the sidebar */
#cart, #cart table {
font-size: smaller;
color: white;
}
#cart table {
border-top: 1px dotted #595;
border-bottom: 1px dotted #595;
margin-bottom: 10px;
}
Change the redirect to be back to the store.
edit app/controllers/line_items_controller.rb
def create
product = Product.find(params[:product_id])
@line_item = @cart.add_product(product.id)
@line_item.product = product
respond_to do |format|
if @line_item.save
format.html { redirect_to(store_url) }
format.xml { render :xml => @line_item,
:status => :created, :location => @line_item }
else
format.html { render :action => "new" }
format.xml { render :xml => @line_item.errors,
:status => :unprocessable_entity }
end
end
end
Purchase another product.
get /
Pragmatic Bookshelf
| 2× | CoffeeScript | $72.00 |
| 1× | Programming Ruby 1.9 & 2.0 | $49.95 |
| Total | $121.95 | |
CoffeeScript is JavaScript done right. It provides all of JavaScript's functionality wrapped in a cleaner, more succinct syntax. In the first book on this exciting new language, CoffeeScript guru Trevor Burnham shows you how to hold onto all the power and flexibility of JavaScript while writing clearer, cleaner, and safer code.
Ruby is the fastest growing and most exciting dynamic language out there. If you need to get working programs delivered fast, you should add Ruby to your toolbox.
Rails Test Prescriptions is a comprehensive guide to testing Rails applications, covering Test-Driven Development from both a theoretical perspective (why to test) and from a practical perspective (how to test effectively). It covers the core Rails testing tools and procedures for Rails 2 and Rails 3, and introduces popular add-ons, including Cucumber, Shoulda, Machinist, Mocha, and Rcov.
post /line_items?product_id=3
get http://localhost:3000/
Pragmatic Bookshelf
| 2× | CoffeeScript | $72.00 |
| 2× | Programming Ruby 1.9 & 2.0 | $99.90 |
| Total | $171.90 | |
CoffeeScript is JavaScript done right. It provides all of JavaScript's functionality wrapped in a cleaner, more succinct syntax. In the first book on this exciting new language, CoffeeScript guru Trevor Burnham shows you how to hold onto all the power and flexibility of JavaScript while writing clearer, cleaner, and safer code.
Ruby is the fastest growing and most exciting dynamic language out there. If you need to get working programs delivered fast, you should add Ruby to your toolbox.
Rails Test Prescriptions is a comprehensive guide to testing Rails applications, covering Test-Driven Development from both a theoretical perspective (why to test) and from a practical perspective (how to test effectively). It covers the core Rails testing tools and procedures for Rails 2 and Rails 3, and introduces popular add-ons, including Cucumber, Shoulda, Machinist, Mocha, and Rcov.
11.2 Iteration F2: Creating an AJAX-Based Cart 10.4 Playtime