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

abtin
page 20: … protoc command… I had to additionally run the following go get commands in order to be able to compile protobuf code using go...
New
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
iPaul
page 37 ANTLRInputStream input = new ANTLRInputStream(is); as of ANTLR 4 .8 should be: CharStream stream = CharStreams.fromStream(i...
New
jesse050717
Title: Web Development with Clojure, Third Edition, pg 116 Hi - I just started chapter 5 and I am stuck on page 116 while trying to star...
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
herminiotorres
Hi @Margaret , On page VII the book tells us the example and snippets will be all using Elixir version 1.11 But on page 3 almost the en...
New
cro
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
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
jonmac
The allprojects block listed on page 245 produces the following error when syncing gradle: “org.gradle.api.GradleScriptException: A prob...
New
New

Other popular topics Top

axelson
I’ve been really enjoying obsidian.md: It is very snappy (even though it is based on Electron). I love that it is all local by defaul...
New
dasdom
No chair. I have a standing desk. This post was split into a dedicated thread from our thread about chairs :slight_smile:
New
AstonJ
In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...
New
Exadra37
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
AstonJ
If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issu...
New
gagan7995
API 4 Path: /user/following/ Method: GET Description: Returns the list of all names of people whom the user follows Response [ { ...
New
New
PragmaticBookshelf
Author Spotlight Rebecca Skinner @RebeccaSkinner Welcome to our latest author spotlight, where we sit down with Rebecca Skinner, auth...
New
DevotionGeo
I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like...
New
New

Sub Categories: