Andrei

Andrei

Agile Web Development with Rails 7: Missing instructions on building an Atom feed (page 181)

@rubys

On the page 181 it’s said:

We also don’t have time to build a full-fledged admin user interface right now, so we’ll take advantage of the various Atom feed readers that exist and have our app export all the orders as an Atom feed so the customer can quickly see what’s been purchased.

Looks like instructions on creating an Atom feed should follow right there, but they are missing. On the page 182 it’s said:

What We Just Did:

  • We provided a feed so the administrator can monitor incoming orders.

And on the page 183:

Playtime
Here’s some stuff to try on your own:

  • Get HTML- and JSON-formatted views working for who_bought requests. Experiment with including the order information in the JSON view by rendering @product.to_json(include: :orders). Do the same thing for XML using ActiveModel::Serializers::Xml.2

Looks like this task is related to the Atom feed that should have been built above.

Most Liked

rubys

rubys

Author of Agile Web Development With Rails

XML seems to be increasingly de-emphasized these days, but here is the essence of what was in that section:

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 < ApplicationRecord
  has_many :line_items
  has_many :orders, through: :line_items
  #...
end

Where Next?

Popular Pragmatic Bookshelf topics Top

New
telemachus
Python Testing With Pytest - Chapter 2, warnings for “unregistered custom marks” While running the smoke tests in Chapter 2, I get these...
New
fynn
This is as much a suggestion as a question, as a note for others. Locally the SGP30 wasn’t available, so I ordered a SGP40. On page 53, ...
New
jskubick
I think I might have found a problem involving SwitchCompat, thumbTint, and trackTint. As entered, the SwitchCompat changes color to hol...
New
nicoatridge
Hi, I have just acquired Michael Fazio’s “Kotlin and Android Development” to learn about game programming for Android. I have a game in p...
New
taguniversalmachine
It seems the second code snippet is missing the code to set the current_user: current_user: Accounts.get_user_by_session_token(session["...
New
mert
AWDWR 7, page 152, page 153: Hello everyone, I’m a little bit lost on the hotwire part. I didn’t fully understand it. On page 152 @rub...
New
tkhobbes
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
New
Keton
When running the program in chapter 8, “Implementing Combat”, the printout Health before attack was never printed so I assumed something ...
New
New

Other popular topics Top

AstonJ
A thread that every forum needs! Simply post a link to a track on YouTube (or SoundCloud or Vimeo amongst others!) on a separate line an...
New
AstonJ
If it’s a mechanical keyboard, which switches do you have? Would you recommend it? Why? What will your next keyboard be? Pics always w...
New
AstonJ
Thanks to @foxtrottwist’s and @Tomas’s posts in this thread: Poll: Which code editor do you use? I bought Onivim! :nerd_face: https://on...
New
AstonJ
Do the test and post your score :nerd_face: :keyboard: If possible, please add info such as the keyboard you’re using, the layout (Qw...
New
Exadra37
I am asking for any distro that only has the bare-bones to be able to get a shell in the server and then just install the packages as we ...
New
AstonJ
Biggest jackpot ever apparently! :upside_down_face: I don’t (usually) gamble/play the lottery, but working on a program to predict the...
New
New
PragmaticBookshelf
Explore the power of Ash Framework by modeling and building the domain for a real-world web application. Rebecca Le @sevenseacat and ...
New
AstonJ
Curious what kind of results others are getting, I think actually prefer the 7B model to the 32B model, not only is it faster but the qua...
New
PragmaticBookshelf
A concise guide to MySQL 9 database administration, covering fundamental concepts, techniques, and best practices. Neil Smyth MySQL...
New

Latest in Agile Web Development with Rails 7

Agile Web Development with Rails 7 Portal

Sub Categories: