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

New
simonpeter
When I try the command to create a pair of migration files I get an error. user=&gt; (create-migration "guestbook") Execution error (Ill...
New
HarryDeveloper
Hi @venkats, It has been mentioned in the description of ‘Supervisory Job’ title that 2 things as mentioned below result in the same eff...
New
AleksandrKudashkin
On the page xv there is an instruction to run bin/setup from the main folder. I downloaded the source code today (12/03/21) and can’t see...
New
gilesdotcodes
In case this helps anyone, I’ve had issues setting up the rails source code. Here were the solutions: In Gemfile, change gem 'rails' t...
New
brian-m-ops
#book-python-testing-with-pytest-second-edition Hi. Thanks for writing the book. I am just learning so this might just of been an issue ...
New
jskubick
I’m under the impression that when the reader gets to page 136 (“View Data with the Database Inspector”), the code SHOULD be able to buil...
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
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
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

dasdom
No chair. I have a standing desk. This post was split into a dedicated thread from our thread about chairs :slight_smile:
New
brentjanderson
Bought the Moonlander mechanical keyboard. Cherry Brown MX switches. Arms and wrists have been hurting enough that it’s time I did someth...
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
Create efficient, elegant software tests in pytest, Python's most powerful testing framework. Brian Okken @brianokken Edited by Kat...
New
hilfordjames
There appears to have been an update that has changed the terminology for what has previously been known as the Taskbar Overflow - this h...
New
First poster: bot
zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig. General-purpose programming language and toolchain for maintaini...
New
New
PragmaticBookshelf
Develop, deploy, and debug BEAM applications using BEAMOps: a new paradigm that focuses on scalability, fault tolerance, and owning each ...
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
AstonJ
This is cool! DEEPSEEK-V3 ON M4 MAC: BLAZING FAST INFERENCE ON APPLE SILICON We just witnessed something incredible: the largest open-s...
New

Sub Categories: