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

jimschubert
In Chapter 3, the source for index introduces Config on page 31, followed by more code including tests; Config isn’t introduced until pag...
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
GilWright
Working through the steps (checking that the Info,plist matches exactly), run the demo game and what appears is grey but does not fill th...
New
yulkin
your book suggests to use Image.toByteData() to convert image to bytes, however I get the following error: "the getter ‘toByteData’ isn’t...
New
jamis
The following is cross-posted from the original Ray Tracer Challenge forum, from a post by garfieldnate. I’m cross-posting it so that the...
New
sdmoralesma
Title: Web Development with Clojure, Third Edition - migrations/create not working: p159 When I execute the command: user=&gt; (create-...
New
brunogirin
When running tox for the first time, I got the following error: ERROR: InterpreterNotFound: python3.10 I realised that I was running ...
New
dsmith42
Hey there, I’m enjoying this book and have learned a few things alredayd. However, in Chapter 4 I believe we are meant to see the “&gt;...
New
redconfetti
Docker-Machine became part of the Docker Toolbox, which was deprecated in 2020, long after Docker Desktop supported Docker Engine nativel...
New
mcpierce
@mfazio23 I’ve applied the changes from Chapter 5 of the book and everything builds correctly and runs. But, when I try to start a game,...
New

Other popular topics Top

siddhant3030
I’m thinking of buying a monitor that I can rotate to use as a vertical monitor? Also, I want to know if someone is using it for program...
New
AstonJ
Curious to know which languages and frameworks you’re all thinking about learning next :upside_down_face: Perhaps if there’s enough peop...
New
AstonJ
Just done a fresh install of macOS Big Sur and on installing Erlang I am getting: asdf install erlang 23.1.2 Configure failed. checking ...
New
Margaret
Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.
1147 29994 760
New
New
PragmaticBookshelf
Author Spotlight Mike Riley @mriley This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...
New
First poster: bot
zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig. General-purpose programming language and toolchain for maintaini...
New
New
AstonJ
If you’re getting errors like this: psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...
New
NewsBot
Node.js v22.14.0 has been released. Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub
New

Sub Categories: