Nathan Kidd n-at-han-k

Rails transactions: The Complete Guide (Just for me to learn)

Rails transactions are a way to ensure that a set of database operations will only occur if all of them succeed. Otherwise, they will rollback to the previous state of data.

Our examples will demonstrate it in the most useful scenario for transactions: money transfers. In this case, you only want Ted to receive money if John loses the same money. Basic usage

def transfer_money
 ActiveRecord::Base.transaction do

Improved YARD CHEATSHEET http://yardoc.org

forked from https://gist.github.com/chetan/1827484 which is from early 2012 and contains outdated information.

Templates to remind you of the options and formatting for the different types of objects you might want to document using YARD.

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

Setup a Rails, NGINX, HTTPS dev box

I was implementing https://layer.com/ on https://zeemee.com and they require https for the callbacks. Since this was new to me and took me a while here's a how to if anyone is looking.

Assumptions

You already have a rails app running on localhost:3000

	Admiral
	Air Chief Marshal
	Air Commodore
	Air Marshal
	Air Vice Marshal
	Alderman
	Ambassador
	Ambassador-at-Large
	Archbishop
	Archbishop Emeritus

	class Stack {
	constructor(list) {
	this.list = {}
	this.count = 0
	}

	push(value) {
	this.list[this.count] = value
	this.count++
	}

	/**
	* dwmconfig.h
	* Hardware multimedia keys
	*/
	/* Somewhere at the beginning of config.h include: */

	/*
	You obviously need the X11 development packages installed, X11proto in particular, but
	here is the location of the keysyms header upstream copy if you can't bother
	using the contents of your own hard drive. ;-P

	const Label = {
	B1 : 'event_btn_1',
	B2 : 'event_btn_2',
	B3 : 'event_btn_3',
	CNT : 'continue',
	ION : 'LithiumIon',
	ION_H : 'LithiumIon_TD',
	MTL : 'LithiumMetal',
	MTL_H : 'LithiumMetal_TD',
	};

	! model
	pc101 Generic 101-key PC
	pc102 Generic 102-key (Intl) PC
	pc104 Generic 104-key PC
	pc105 Generic 105-key (Intl) PC
	dell101 Dell 101-key PC
	latitude Dell Latitude series laptop
	dellm65 Dell Precision M65
	everex Everex STEPnote
	flexpro Keytronic FlexPro

	#!/usr/bin/env ruby

	if fetched_file_blank? or fetched_file_expired?
	fetch!
	end

	write_cached_screenfetch!

	BEGIN {
	COMMAND = 'screenfetch'.freeze