I'd like to reflect on what I've learned this week. There aren't any specific concepts that are of focus, this is essentially the net of what I googled throughout the week.

Pattern matching on an …

Erlang

iex

I learned that iex isn't technically a true REPL [5][iexrepl].

elixir

Application logging

I also got to take a deeper foray into application logging. I've be…

Elixir

Documentation

You can't use @doc on private functions

Interestingly you can't use @doc macro for private functions. I understand the argument that documentation shouldn't be ge…

Elixir

Learning resources

Sites

Elixir school

Self proclaimed as

The premier destination for learning and mastering Elixir

I've recently played with [Elixir school][elixir-schoo…

Elixir

Map.get defaults

Something small, but I realized that you can pass in a default to Map.get in case the key you're looking for doesn't exist.

Enum.reduce_while

I also discovered…

Elixir

iex

export ERL_AFLAGS="-kernel shell_history enabled"

Posts

A proposal for an Absinthe application structure

Found that [this][graphql-project-structure] was a …

Elixir

Tests

I've been working on a personal project in my spare time and I've been focusing on writing unit and integration tests. I've probably spent more time writing tests than I have wri…

Elixir

ExUnit

Disabling tests with a @tag :skip

I've worked in systems where you can specify different groups of test. For example the last place I worked allowed you to mark a test aro…

Github actions

Deploying to Gigalixir

Assumptions

This guide assumes that you're already running a Gigalixir application and have set up the necessary environment variables in Gigalixir…

Gigalixir

Resetting your database

Drop into a remote console

gigalixir ps:remote_console

Tear down the database and re-seed it.

# Migrate down
Ecto.Migrator.run(MyApp…

Elixir

Environment variable use in config.exs vs application code

tl;dr

config.exs is executed at compile time. Any calls to System.get_env/1 will be executed in your build environm…

Elixir

This week's post is going to be pretty light on original content. Here's a digest of some informative links I read this week.

Implementing fuzzy search with Postgres and Ecto

I was su…

The many different ways to preload

Ecto has quite a few different ways to preload entities. I always find myself forgetting each of the different ways, so I'm just going to post each approach in h…

Sometimes when you're using IO.inspect/2 to debug values, your output can be a bit overwhelming. To make things easier to read, you can pass IO.inspect/2 a label option.

Before

Inte…

While at work I was reading through the exq library I stumbled upon an issue that discussed the perils of running a Superviso…

Elixir DI

Below are a few references that I thought were good discussions around how to achieve DI in Elixir.

References

Elixir

• http://stratus3d.com/blog/2021/08/24/guide-to-tracing-in-erlang
• http://beam-wisdoms.clau.se/en/latest/

Functional programming with Typescript

• https://www.typescriptlang.org/docs/…

What I'm thinking about

Quotes

Seneca on time

It is not that we have a short space of time, but that we waste much of it. Life is long enough, and it has been given in sufficiently ge…

Define a service file

Defining the following ensures that even after system restart your service is restarted

# /lib/systemd/system/torrent_top_10.service
[Unit]
Description=Run top 10 torren…

What I'm thinking about

Cancun

Quotes

Many years ago I was told by a very wise man "Mind Ok, Everything Ok". It is so true. I have encountered poor, sick people who are happy, and rich…

Lifecycle methods

mount or handle_params

The golden rule is: always load data on mount. But if you add live navigation with live_patch, the data that can be changed on-the-fly must be now…

For a personal project I have some generators for live views. They handle most of the boilerplate of starting a live view based feature and create components, as well as their concomitant test files. …

Background

While working through some of the ex_twilio documentation, I couldn't find any specific examples of how to respond to incoming…

⚠️ Warning

Since the release of Phoenix LiveView 0.18.0 this post is no longer relevant. The remainder of this post is left h…

Properties with a leading colon

If you're using Alpine as part of your stack, you'll most likely have run into this one.

Problem

# ...
def some_component(assigns) do
  ~H"""
  <div…

Here's the associated git repo. This is here primarily for seo and simplicity.

{
  "version": "2.0.0",
  "tasks": [
    {
     …

Even when an idea seems obvious, it can be useful to put a label or name to it. That is, once you explicitly identify something, it becomes easier to reason about or remember if you create a simple fa…

Description

When modifying form values in Phoenix LiveView, it is possible to modify the value of all form fields that are not in focus on the client side from the server side. It is not possi…