joepstender

joepstender

Programming Phoenix LiveView: errata and remarks Version B2.0

The generated iex result below should list products instead of product for the metadata. (page 67)

iex> product = %Product{}
 %Pento.Catalog.Product{
 __meta__: #Ecto.Schema.Metadata<:built, "product">,
 …
}

The mount/3 function that is generated is different from the one used in the example, this might be confusing if you are familiar with the way pipes are used in Elixir. (Page 87)

def mount(_params, _session, socket) do
 {:ok,
 socket
 |> assign(:greeting, "Welcome to Pento!") # add this line
 |> assign(:products, list_products())}
end

Instead of

{:ok, assign(socket, :products, list_products())}

These few lines of code are a bit different from what we’ve seen before,… (Page 98)

Actually we have already seen this exact code 2 pages earlier, starting on page 96.
Suggestion: introduce the repeated code with: “Here’s the line of code that calls the modal component from the index template again:”

That means the component must implement a handle_event/3 function for the “close” event, which is does here: (Page 103)

Should be “… which it does here:”

Notice there’s an :id key, as well as a :component key that specifies the FormComponent (Page 106)

It is unclear what the :component_key is.

Marked As Solved

SophieDeBenedetto

SophieDeBenedetto

Author of Programming Phoenix LiveView

Hello! Thank you so much for your feedback, we really appreciate it :slight_smile:

Let’s go through it one thing as a time:

The generated iex result below should list products instead of product for the metadata. (page 67)

You are totally right! You’ll find this fixed in the next Beta release. Thanks for pointing it out :slight_smile:

The mount/3 function that is generated is different from the one used in the example, this might be confusing if you are familiar with the way pipes are used in Elixir. (Page 87)

Good catch! In fact this code snippet does change the way the generated mount/3 function calls assign in order to add the products to the socket. You’ll find this updated for clarity in the next Beta release.

Actually we have already seen this exact code 2 pages earlier, starting on page 96.
Suggestion: introduce the repeated code with: “Here’s the line of code that calls the modal component from the index template again :”

Yep you are right that we’ve shown you this code snippet already. I’ll add some language to clarify that in the next release.

Should be “… which it does here:”

Nice catch! Will fix in the next release.

It is unclear what the :component_key is.

The :component key points to a value of the component that will be rendered in the modal–FormComponent. I’ll add some language to clarify this but we also go into greater detail just a bit further on in the chapter.

Thanks again!

Where Next?

Popular Pragmatic Bookshelf topics Top

jeffmcompsci
Title: Design and Build Great Web APIs - typo “https://company-atk.herokuapp.com/2258ie4t68jv” (page 19, third bullet in URL list) Typo:...
New
Mmm
Hi, build fails on: bracket-lib = “~0.8.1” when running on Mac Mini M1 Rust version 1.5.0: Compiling winit v0.22.2 error[E0308]: mi...
New
alanq
This isn’t directly about the book contents so maybe not the right forum…but in some of the code apps (e.g. turbo/06) it sends a TURBO_ST...
New
rmurray10127
Title: Intuitive Python: docker run… denied error (page 2) Attempted to run the docker command in both CLI and Powershell PS C:\Users\r...
New
oaklandgit
Hi, I completed chapter 6 but am getting the following error when running: thread 'main' panicked at 'Failed to load texture: IoError(O...
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
andreheijstek
After running /bin/setup, the first error was: The foreman' command exists in these Ruby versions: That was easy to fix: gem install fore...
New
a.zampa
@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
davetron5000
Hello faithful readers! If you have tried to follow along in the book, you are asked to start up the dev environment via dx/build and ar...
New

Other popular topics Top

New
PragmaticBookshelf
Machine learning can be intimidating, with its reliance on math and algorithms that most programmers don't encounter in their regular wor...
New
PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
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
PragmaticBookshelf
Author Spotlight: VM Brasseur @vmbrasseur We have a treat for you today! We turn the spotlight onto Open Source as we sit down with V...
New
PragmaticBookshelf
Author Spotlight: Peter Ullrich @PJUllrich Data is at the core of every business, but it is useless if nobody can access and analyze ...
New
AstonJ
This is a very quick guide, you just need to: Download LM Studio: https://lmstudio.ai/ Click on search Type DeepSeek, then select the o...
New
RobertRichards
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
Fl4m3Ph03n1x
Background Lately I am in a quest to find a good quality TTS ai generation tool to run locally in order to create audio for some videos I...
New
PragmaticBookshelf
Use advanced functional programming principles, practical Domain-Driven Design techniques, and production-ready Elixir code to build scal...
New

Sub Categories: