12.4 Iteration G2: Downloading an eBook 12.1 Iteration H1: Capturing an Order
Demonstrate various respond_to/format options, as well as "through" relations and basic authentication.
Define a "who_bought" member action
edit app/controllers/products_controller.rb
def who_bought
@product = Product.find(params[:id])
@latest_order = @product.orders.order(:updated_at).last
if stale?(@latest_order)
respond_to do |format|
format.atom
end
end
end
Define an Atom view (using the Atom builder)
edit app/views/products/who_bought.atom.builder
atom_feed do |feed|
feed.title "Who bought #{@product.title}"
feed.updated @latest_order.try(:updated_at)
@product.orders.each do |order|
feed.entry(order) do |entry|
entry.title "Order #{order.id}"
entry.summary type: 'xhtml' do |xhtml|
xhtml.p "Shipped to #{order.address}"
xhtml.table do
xhtml.tr do
xhtml.th 'Product'
xhtml.th 'Quantity'
xhtml.th 'Total Price'
end
order.line_items.each do |item|
xhtml.tr do
xhtml.td item.product.title
xhtml.td item.quantity
xhtml.td number_to_currency item.total_price
end
end
xhtml.tr do
xhtml.th 'total', colspan: 2
xhtml.th number_to_currency \
order.line_items.map(&:total_price).sum
end
end
xhtml.p "Paid by #{order.pay_type}"
end
entry.author do |author|
author.name order.name
author.email order.email
end
end
end
end
Add "orders" to the Product class
edit app/models/product.rb
class Product < ActiveRecord::Base
has_many :line_items
has_many :orders, through: :line_items
#...
end
Add to the routes
edit config/routes.rb
Fetch the Atom feed
curl --max-time 15 --silent --user dave:secret http://localhost:3000/products/2/who_bought.atom
<?xml version="1.0" encoding="UTF-8"?>
<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom">
<id>tag:localhost,2005:/products/2/who_bought</id>
<link rel="alternate" type="text/html" href="http://localhost:3000"/>
<link rel="self" type="application/atom+xml" href="http://localhost:3000/products/2/who_bought.atom"/>
<title>Who bought Rails, Angular, Postgres, and Bootstrap</title>
<updated>2017-06-02T13:41:58Z</updated>
<entry>
<id>tag:localhost,2005:Order/1</id>
<published>2017-06-02T13:41:58Z</published>
<updated>2017-06-02T13:41:58Z</updated>
<link rel="alternate" type="text/html" href="http://localhost:3000/orders/1"/>
<title>Order 1</title>
<summary type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<p>Shipped to 123 Main St</p>
<table>
<tr>
<th>Product</th>
<th>Quantity</th>
<th>Total Price</th>
</tr>
<tr>
<td>Rails, Angular, Postgres, and Bootstrap</td>
<td>1</td>
<td>$45.00</td>
</tr>
<tr>
<th colspan="2">total</th>
<th>$45.00</th>
</tr>
</table>
<p>Paid by Check</p>
</div>
</summary>
<author>
<name>Dave Thomas</name>
<email>customer@example.com</email>
</author>
</entry>
</feed>
Look at the headers
curl --max-time 15 --silent --dump - --output /dev/null --user dave:secret http://localhost:3000/products/2/who_bought.atom
HTTP/1.1 200 OK
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Etag: "6a653d07bb4de06b163121e555ef9772"
Last-Modified: Fri, 02 Jun 2017 13:41:58 GMT
Content-Type: application/atom+xml; charset=utf-8
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: d1938be1-2130-4f51-93b7-c3963c55078e
X-Runtime: 0.012410
Server: WEBrick/1.3.1 (Ruby/2.2.6/2016-11-15)
Date: Fri, 02 Jun 2017 13:41:58 GMT
Content-Length: 1378
Connection: Keep-Alive
curl --max-time 15 --silent --dump - --output /dev/null --user dave:secret http://localhost:3000/products/2/who_bought.atom -H 'If-None-Match: "6a653d07bb4de06b163121e555ef9772"'
HTTP/1.1 304 Not Modified
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Etag: "6a653d07bb4de06b163121e555ef9772"
Last-Modified: Fri, 02 Jun 2017 13:41:58 GMT
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: 9780547e-088b-4dd7-9b3b-9438a51bab99
X-Runtime: 0.004060
Server: WEBrick/1.3.1 (Ruby/2.2.6/2016-11-15)
Date: Fri, 02 Jun 2017 13:41:58 GMT
Connection: Keep-Alive
curl --max-time 15 --silent --dump - --output /dev/null --user dave:secret http://localhost:3000/products/2/who_bought.atom -H 'If-Modified-Since: Fri, 02 Jun 2017 13:41:58 GMT'
HTTP/1.1 304 Not Modified
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Etag: "6a653d07bb4de06b163121e555ef9772"
Last-Modified: Fri, 02 Jun 2017 13:41:58 GMT
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: 4f49d3b5-2c6e-4298-8e8f-926b673005e1
X-Runtime: 0.004903
Server: WEBrick/1.3.1 (Ruby/2.2.6/2016-11-15)
Date: Fri, 02 Jun 2017 13:41:58 GMT
Connection: Keep-Alive
12.4 Iteration G2: Downloading an eBook 12.1 Iteration H1: Capturing an Order