In this episode of ElixirMix, we talk with Alvise Susmel about building Elixir systems that leverage Python image detection on video frames. We cover Ports vs NIFs, using different platforms for their strengths, cool embedded hardware, displaying real time results in Phoenix or Scenic, and much more!

Podcast Episode

In this episode of ElixirMix, we talk with Alvise Susmel about building Elixir systems that leverage Python image detection on video frames. We cover Ports vs NIFs, using different platforms for their strengths, cool embedded hardware, displaying real time results in Phoenix or Scenic, and much more!

Podcast Episode

Using Bamboo and Mailgun to configure different environments and send emails from Phoenix.

‪https://phxroad.com/phoenix/use-bamboo-to-send-email-in-phoenix‬

I wrote an Elixir client for the Nu HTML Checker (validator.w3.org/nu). It offers ExUnit assertions for validating dynamic content in tests (e.g. in Phoenix controller tests), Mix tasks for validating static content, and general purpose functions to fulfill other needs.

Part 7 of the Simple Phoenix LiveView App series.

In this episode, we’ll build the live views and templates for the show and edit pages, fix a few bugs and finish converting users from traditional CRUD to LiveView. After this episode, we won’t need the user controller at all.

https://alchemist.camp/episodes/phoenix-live-view-show-and-edit

I wrote a blog post explaining the internals of how Phoenix Live Reload works:

https://shankardevy.com/code/phoenix-live-reload/

For the brave ones, I have 3 challenge questions towards the end of the post. Will be happy to see devs solve them :-)

Refactor my application to use Context.

https://github.com/co0lsky/deep-work-hours-phoenix/commit/2d290265ad4b017d4399145ebfa87ea215a4aae1

I wrote a couple of blog posts that are seemingly as basic as they come but I dug a little deeper than you’d expect. :)

• Hello World in Elixir

• String Length in Elixir

Changelog

Enhancements

• Treat .leex files as .eex files, so same features apply to both.
• Switch build to GitHub Actions.
• Update build to IntelliJ IDEA 2020.1

Bug Fixes

• Swap improperly sized General.QuestionDialog icon for RunConfigurations.TestUnknown icon for Unknown icon in Structure View.

• Fix MODULENAME variable in defm live template, so that the file name is camel-cased before being capitalized.

• Update README.md about information for Goland IDE since has been released for awhile and no longer only an EAP.

• Restore canary builds being published to JetBrains Marketplace.

• JetBrains IDEs 2020.1 compatibility

  • Change obsolete references to AllocIcons in Icons to new ones in AlllIcons that are recommended in documentation.

  • Update to @NotNull annotation on PsiElementVisitor

    • DepGatherer
    • QuotableImpl.quote

  • Fix tests for IDEA 2020.1.

  • Get ProjectImportProvider builder in doGetBuilder instead of constructor.

    Fixes use of deprecated constructor dependency injection that is incompatible with dynamic, injectable plugins in 2020.1.

    com.intellij.diagnostic.PluginException: getComponentAdapterOfType is
    used to get org.elixir_lang.mix.project._import.Builder(
      requestorClass=org.elixir_lang.mix.project._import.Provider,
      requestorConstructor=protected org.elixir_lang.mix.project._import.Provider(org.elixir_lang.mix.project._import.Builder)
    ).
    Probably constructor should be marked as NonInjectable. [Plugin: org.elixir_lang]

• Allow underscores in binary (0b), octal (0o) , and hexadecimal (0x) numbers.

Installation Instructions

Special live episode recording today at 11AM EDT - with many special guests including the Elixir Outlaws, Dave Thomas, Meryl Dakin, Saša Jurić, the Freezes, Frank Hunleth, and lots more!

https://www.twitch.tv/smartlogictv

ExUnited  is a Hex package designed to easily facilitate spawning  supervising  local Elixir nodes within tests. Unfortunately, I was not able to properly setup a spawned node for supervisioning with the Erlang  :slave.start_link/1  function. So I have written  ExUnited  to accomplish that, along with supporting  Mix.Config  configurations, additional loaded code, and a developer friendly way of writing assertions and refutations in the context of a spawned node which really improved the readability of the tests and more.

Features

• Spawn nodes for testing purposes
• Spin up “partially connected” vs “fully connected” nodes
• Run in “verbose” mode which prints a colorized STDOUT of the nodes
• Specify extra “code paths” which will be included ( config.exs  included)
• Support child supervisioning within a spawned node
• Exclude certain dependencies for spawned nodes
• Easily assert and refute within the context of spawned nodes

Example

defmodule MyNodeClusterTest do
  use ExUnited.Case

  setup do
    {:ok, spawned} =
      ExUnited.spawn(
        david: [code_paths: ["test/nodes/beckham"], supervise: [David]]
      )

    on_exit(fn ->
      ExUnited.teardown()
    end)

    spawned
  end

  test "executes code in spawned node", spawned do
    assert :"captain@127.0.0.1" = Node.self()
    refute :"david@127.0.0.1" == Node.self()
    sentence = "The only time you run out of chances is when you stop taking them."

    as_node(:david, phrase: sentence) do
      assert :"david@127.0.0.1" = Node.self()
      refute :"captain@127.0.0.1" == Node.self()
      assert ^phrase = David.talk()

      foo = :bar
      refute match?(%{node: ^foo}, %{node: :foo})
    end
  end
end

See full example.

Enjoy the package! I would love to receive a shoutout and/or your feedback ;)

A small tutorial on how, why and when to use raw SQL, as well as giving some examples using Ecto and AyeSQL.

AyeSQL: Writing Raw SQL in Elixir

Gigalixir is Elixir’s Platform as a Service. In this episode we create and deploy a new Elixir application with Gigalixir.

https://elixircasts.io/deploying-with-gigalixir-(revised)

You might be bored being locked down and using the same default IEx prompt. Let’s turn our boredom interesting by decorating IEx look out.

Check out the Setup and Installation

https://medium.com/@blackode/custom-iex-prompt-elixir-c95b7f5bf8c3

A simple Elixir wrapper for https://covidtracking.com/api:https://github.com/TheFirstAvenger/covidtracking_dot_com_api

GenRMQ is a set of behaviours meant to be used to create RabbitMQ consumers and publishers.

Changelog:

With the redesigned queue configuration options, users have bigger flexibility in creating their desired consumer setup. This includes support for quorum queues as well. Check our documentation to learn more: https://github.com/meltwater/gen_rmq#documentation

Lettuce is a generic server process that checks the files within an elixir project that has lettuce as a dependency and then runs iex -S mix. It initialises the state of the generic server with the .ex files inside lib and their last modified time.

https://github.com/gilacost/lettuce

Final episode of the Elixir Wizards Podcast third season. Check it out here: https://podcast.smartlogic.io/s3e19-season-wrap

We created and open sourced a small tool to persist events from Mailgun, since the retention they offer is expensive. Mailgun boost a fantastic tool, we just wanted simple logging in case we needed it. Fork, run the source or use the docker container.

https://jackjoe.be/articles/mailgun-logger/

Going beyond simple mapping - a refresher on comprehensions and what they can do.

https://www.pompecki.com/post/for-comprehensions/