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

iPaul
page 37 ANTLRInputStream input = new ANTLRInputStream(is); as of ANTLR 4 .8 should be: CharStream stream = CharStreams.fromStream(i...
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
leonW
I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...
New
digitalbias
Title: Build a Weather Station with Elixir and Nerves: Problem connecting to Postgres with Grafana on (page 64) If you follow the defau...
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
brunogirin
When trying to run tox in parallel as explained on page 151, I got the following error: tox: error: argument -p/–parallel: expected one...
New
hazardco
On page 78 the following code appears: <%= link_to ‘Destroy’, product, class: ‘hover:underline’, method: :delete, data: { confirm...
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
dtonhofer
@parrt In the context of Chapter 4.3, the grammar Java.g4, meant to parse Java 6 compilation units, no longer passes ANTLR (currently 4....
New
dachristenson
@mfazio23 Android Studio will not accept anything I do when trying to use the Transformations class, as described on pp. 140-141. Googl...
New

Other popular topics Top

PragmaticBookshelf
Take your Go skills to the next level by learning how to design, develop, and deploy a distributed service. Start from the bare essential...
New
New
ohm
Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
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
AstonJ
We’ve talked about his book briefly here but it is quickly becoming obsolete - so he’s decided to create a series of 7 podcasts, the firs...
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
First poster: AstonJ
Jan | Rethink the Computer. Jan turns your computer into an AI machine by running LLMs locally on your computer. It’s a privacy-focus, l...
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
PragmaticBookshelf
Use advanced functional programming principles, practical Domain-Driven Design techniques, and production-ready Elixir code to build scal...
New

Sub Categories: