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Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

This document contains some ideas for additions to the Nix language.

The Nix package manager, Nixpkgs and NixOS currently have several problems:

Poor discoverability of package options. Package functions have function arguments like enableFoo, but there is no way for the Nix UI to discover them, let alone to provide programmatic ways to

sudo pacman -S virt-manager virt-viewer qemu qemu-arch-extra \
edk2-ovmf vde2 ebtables dnsmasq bridge-utils openbsd-netcat libguestfs

	name: E2E tests

	on:
	workflow_dispatch:
	# daily builds on week days at 6pm EDT (22:00 UTC or 23:00 UTC (day light savings adjustment))
	schedule:
	- cron: '00 23 * * 1,2,3,4,5'

	env:
	NO_FLIPPER: 1

	# On the host to run the container
	docker run --privileged -i -t -v ~/host-folder-to-mount:/root/folder-ro:ro ubuntu

	# Inside the container
	# Need to create the upper and work dirs inside a tmpfs.
	# Otherwise OverlayFS complains about AUFS folders.
	mkdir -p /tmp/overlay && \
	mount -t tmpfs tmpfs /tmp/overlay && \
	mkdir -p /tmp/overlay/{upper,work} && \
	mkdir -p /root/folder && \

	// wiring example for ripping a PMW3360 SROM: https://i.imgur.com/EspAlvz.jpeg
	// set the board to 240mhz or higher for best results (WARNING: higher than 240mhz only works with USB if you overvolt the MCU)
	// this implements reading SPI mode 3. if you want a different mode, you need to edit these two lines:
	// uint32_t clockval = (1 << pin_clock);
	// if (newclock && !clockval && buff_i < buffsize)


	#include <pico/stdlib.h>

	#define buffsize 50000

	eXtreme Go Horse (XGH) Process

	Source: http://gohorseprocess.wordpress.com


	1. I think therefore it's not XGH.
	In XGH you don't think, you do the first thing that comes to your mind. There's not a second option as the first one is faster.

	2. There are 3 ways of solving a problem: the right way, the wrong way and the XGH way which is exactly like the wrong one but faster.
	XGH is faster than any development process you know (see Axiom 14).

	<blockquote class="instagram-media" data-instgrm-captioned data-instgrm-permalink="https://www.instagram.com/p/{{ ig_shortcode }}/?utm_source=ig_embed&utm_campaign=loading" data-instgrm-version="12" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:540px; min-width:326px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);">
	<div style="padding:16px;">
	<a href="https://www.instagram.com/p/{{ ig_shortcode }}/?utm_source=ig_embed&utm_campaign=loading" style=" background:#FFFFFF; line-height:0; padding:0 0; text-align:center; text-decoration:none; width:100%;" target="_blank">
	<div style=" display: flex; flex-direction: row; align-items: center;">
	<div style="background-color: #F4F4F4; border-radius: 50%; flex-grow: 0; height: 40px; margin-right: 14px; width: 40px;"></div>
	<div style="display: flex; flex-direction: column; flex-grow: 1; jus

	Pipeline to send video (simulating SRC) get the data from video0
	gst-launch-1.0 v4l2src device=/dev/video0 \
	! decodebin \
	! x264enc \
	! rtph264pay \
	! udpsink host=localhost port=5000

	// if you are running it inside a docker container be aware of the host ip in udpsink
	gst-launch-1.0 v4l2src device=/dev/video0 \
	! decodebin \