
Andrei
Agile Web Development with Rails 7: Missing instructions on building an Atom feed (page 181)
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
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
1
Popular Pragmatic Bookshelf topics

Running the examples in chapter 5 c under pytest 5.4.1 causes an AttributeError: ‘module’ object has no attribute ‘config’.
In particula...
New

Following the steps described in Chapter 6 of the book, I’m stuck with running the migration as described on page 84:
bundle exec sequel...
New

I am working on the “Your Turn” for chapter one and building out the restart button talked about on page 27. It recommends looking into ...
New

Dear Sophie.
I tried to do the “Authorization” exercise and have two questions:
When trying to plug in an email-service, I found the ...
New

When trying to generate the protobuf .go file, I receive this error:
Unknown flag: --go_opt
libprotoc 3.12.3
MacOS 11.3.1
Googling ...
New

Running mix deps.get in the sensor_hub directory fails with the following error:
** (Mix) No SSH public keys found in ~/.ssh. An ssh aut...
New

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

When running tox for the first time, I got the following error:
ERROR: InterpreterNotFound: python3.10
I realised that I was running ...
New

I’m a newbie to Rails 7 and have hit an issue with the bin/Dev script mentioned on pages 112-113.
Iteration A1 - Seeing the list of prod...
New

@mfazio23
I’m following the indications of the book and arriver ad chapter 10, but the app cannot be compiled due to an error in the Bas...
New
Other popular topics

I know that these benchmarks might not be the exact picture of real-world scenario, but still I expect a Rust web framework performing a ...
New

I am thinking in building or buy a desktop computer for programing, both professionally and on my free time, and my choice of OS is Linux...
New

No chair. I have a standing desk.
This post was split into a dedicated thread from our thread about chairs :slight_smile:
New

Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...
New

Oh just spent so much time on this to discover now that RancherOS is in end of life but Rancher is refusing to mark the Github repo as su...
New

Author Spotlight
Mike Riley
@mriley
This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...
New

Author Spotlight
Erin Dees
@undees
Welcome to our new author spotlight! We had the pleasure of chatting with Erin Dees, co-author of ...
New

Author Spotlight:
Peter Ullrich
@PJUllrich
Data is at the core of every business, but it is useless if nobody can access and analyze ...
New

Author Spotlight:
Bruce Tate
@redrapids
Programming languages always emerge out of need, and if that’s not always true, they’re defin...
New

Hair Salon Games for Girls Fun
Girls Hair Saloon game is mainly developed for kids. This game allows users to select virtual avatars to ...
New
Latest in Agile Web Development with Rails 7
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /ruby
- /wasm
- /erlang
- /phoenix
- /keyboards
- /rails
- /python
- /js
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /opensuse
- /html
- /centos
- /php
- /deepseek
- /zig
- /scala
- /textmate
- /lisp
- /sublime-text
- /nixos
- /debian
- /react-native
- /agda
- /kubuntu
- /arch-linux
- /django
- /revery
- /ubuntu
- /spring
- /manjaro
- /nodejs
- /diversity
- /deno
- /lua
- /julia
- /slackware
- /c