taguniversalmachine

taguniversalmachine

Real-Time Phoenix: ProductChannelTest - undefined function describe/2 (pg 203)

Hi,

I am getting an error I cannot figure out on my test.
I have what I think is the exact code from the book, other than I changed “use” to “import” to fix a deprecation warning:

defmodule Sneakers23Web.ProductChannelTest do

  #use Sneakers23Web.ChannelCase, async: true
  import Sneakers23Web.ChannelCase
  alias Sneakers23Web.{Endpoint, ProductChannel}
  alias Sneakers23.Inventory.CompleteProduct

  describe "notify product released" do
    test "the size selector for the product is broadcast" do
      {inventory, _data} = Test.Factory.InventoryFactory.complete_products()
      [_, product] = CompleteProduct.get_complete_products(inventory)

      topic = "product:#{id}"
      Endpoint.subscribe(topic)

      ProductChannel.notify_product_released(product)

      assert_broadcast "released", %{size_html: html}

      assert html =~ "size-container__entry"

      Enum.each(product.items, fn item ->
        assert html =~ ~s(value="#{item.id}")
      end)
    end
  end
end

The error I get is:

sneakers_23 % mix test

12:57:13.705 [info] Migrations already up

== Compilation error in file test/sneakers_23_web/product_channel_test.exs ==
** (CompileError) test/sneakers_23_web/product_channel_test.exs:8: undefined function describe/2
(stdlib 3.15.2) erl_eval.erl:685: :erl_eval.do_apply/6
(elixir 1.12.1) lib/kernel/parallel_compiler.ex:428: Kernel.ParallelCompiler.require_file/2
(elixir 1.12.1) lib/kernel/parallel_compiler.ex:321: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/7

I can imagine why describe would not show up if I am not importing the right test module, but why is it saying I have describe/2 when I am clearly only giving it one argument? Changing import back to use doesn’t fix anything either.

Marked As Solved

sb8244

sb8244

Author of From Ruby to Elixir and Real-Time Phoenix

Ah, that’s due to the Erlang version. You are right to upgrade it if you’re following with other books.

I’m unsure of the problem you’re facing because changed the use to import in channel_case.ex but no difference is not correct. When you change from use to import there, that warning will disappear.

I’m unable to provide updated code for the book because that has to go through a process with the publisher. I’m willing to evaluate my options for providing a code-update, but I need to get their thoughts here.

What about this: you upload your warning code (not the one with :pg2 failing) to Github and I’ll update it to work with latest Erlang/Elixir without warnings. I cannot do every chapter’s code, but I can do it for the current code you’re stuck on. It is likely something you can then apply to other chapters.

Where Next?

Popular Pragmatic Bookshelf topics Top

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
joepstender
The generated iex result below should list products instead of product for the metadata. (page 67) iex> product = %Product{} %Pento....
New
fynn
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
brunogirin
When I run the coverage example to report on missing lines, I get: pytest --cov=cards --report=term-missing ch7 ERROR: usage: pytest [op...
New
kolossal
Hi, I need some help, I’m new to rust and was learning through your book. but I got stuck at the last stage of distribution. Whenever I t...
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
EdBorn
Title: Agile Web Development with Rails 7: (page 70) I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...
New
bjnord
Hello @herbert ! Trying to get the very first “Hello, Bracket Terminal!" example to run (p. 53). I develop on an Amazon EC2 instance runn...
New
dachristenson
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New
roadbike
From page 13: On Python 3.7, you can install the libraries with pip by running these commands inside a Python venv using Visual Studio ...
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
Margaret
Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.
1147 29994 760
New
AstonJ
Biggest jackpot ever apparently! :upside_down_face: I don’t (usually) gamble/play the lottery, but working on a program to predict the...
New
Maartz
Hi folks, I don’t know if I saw this here but, here’s a new programming language, called Roc Reminds me a bit of Elm and thus Haskell. ...
New
PragmaticBookshelf
Author Spotlight Jamis Buck @jamis This month, we have the pleasure of spotlighting author Jamis Buck, who has written Mazes for Prog...
New
New
PragmaticBookshelf
Programming Ruby is the most complete book on Ruby, covering both the language itself and the standard library as well as commonly used t...
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
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
PragmaticBookshelf
A concise guide to MySQL 9 database administration, covering fundamental concepts, techniques, and best practices. Neil Smyth MySQL...
New

Sub Categories: