Jesse Cooke jc00ke

The Complete Guide to Nested Forms in Phoenix

I recently spent some time dealing with nested forms in Phoenix. Nested forms are great when you want to create multiple database records in a single transaction and associate them with each other. I am new to Phoenix and really struggled to find any resources that helped me with my specific problem. I decided to document what I learned in the process in hopes of helping others that are new to Elixir and Phoenix.

Here is my attempt at a one stop shop to learn everything you will need to know about nested forms. If you would like to view the GitHub repo you can check it out here.

Thanks to Heartbeat and Jose for excellent blog posts on nested forms. Also shoutout to Josh for showing me some examples at Ruby

OverEncrypt

This is a guide that I wrote to improve the default security of my website https://fortran.io , which has a certificate from LetsEncrypt. I'm choosing to improve HTTPS security and transparency without consideration for legacy browser support.

WARNING: if you mess up settings, lose your certificates, or decide to no longer maintain HTTPS certs, these steps can and will make your domain inaccessible.

I would recommend these steps only if you have a specific need for information security, privacy, and trust with your users, and/or maintain a separate secure.example.com domain which won't mess up your main site. If you've been thinking about hosting a site on Tor, then this might be a good option, too.

The best resources that I've found for explaining these steps are https://https.cio.gov , https://certificate-transparency.org , and https://twitter.com/konklone

Script

#!/bin/bash

yum install ncurses-devel openssl-devel -y
yum groupinstall "Development Tools" -y

cd /tmp
wget "http://erlang.org/download/otp_src_21.3.tar.gz" -O otp21.tar.gz

	#!/bin/sh

	#----------------------------------------------------------------------
	# Arch Linux Installation Script
	#
	# This installs, with no intervention (other than initial edit to change
	# RAID array drive values), Arch Linux on an encrypted btrfs raid1 array.
	#----------------------------------------------------------------------

	set -eu

	module A exposing (..)

	import Json.Decode as JD
	import Json.Encode as JE


	type alias User =
	{ id : Int
	, theme : Theme
	}

	------------------------------

	IMPORTANT NOTE:

	Please see @craSH's update to this. He has updated and reformatted these working notes and his version is what I recommend you start with (as of 2021 or later).

	-Ethan

	@craSH fork & update (also listed in the forks on this gist above):

	# Install ARCH Linux with encrypted file-system and UEFI
	# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

	# Download the archiso image from https://www.archlinux.org/
	# Copy to a usb-drive
	dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

	# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

	# This assumes a wifi only system...

	# Corsair headsets will stuck the apps on your linux system. This is due to wrong usb-mapping.

	# thx to http://www.c0urier.net/2016/corsair-gaming-void-usb-rgb-linux-fun

	# 1. open terminal
	# 2. type this and search the line with your headset
	lsusb


	# Get the USB ID of the headset and add it to xorg.conf:

	---
	AWSTemplateFormatVersion: 2010-09-09

	Description: >
	A basic CloudFormation template for an RDS Aurora cluster.

	Parameters:
	DatabaseUsername:
	AllowedPattern: "[a-zA-Z0-9]+"
	ConstraintDescription: must be between 1 to 16 alphanumeric characters.

	## Pre-requisite: You have to know your last commit message from your deleted branch.
	git reflog
	# Search for message in the list
	# a901eda HEAD@{18}: commit: <last commit message>

	# Now you have two options, either checkout revision or HEAD
	git checkout a901eda
	# Or
	git checkout HEAD@{18}