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sudo mount /dev/sda2 /mnt  #Replace sda2 with your linux partition number
for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt$i"; done
sudo chroot /mnt

update-grub
grub-install /dev/sda
update-grub
exit
sudo reboot

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{
  "env": {
    "browser": true,
    "node": true,
    "es6": true
  },

  "plugins": ["react"],

  "ecmaFeatures": {

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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Assuming you already have a Devise model named User and you want to add following Devise Security Extension to it

• Password Expirable
• Password Archivable
• Session Limitable

then your User model should look like following:

User model

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The Ultimate Unit Testing Cheat-sheet

For Mocha, Chai and Sinon

using mocha/chai/sinon for node.js unit-tests? check out my utility: mocha-stirrer to easily reuse test components and mock require dependencies

---

• Sinon Chai
• Chai
• Sinon
• Mocha

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css selector priority

priority	selector	example
1	inline style in html tag	<div style="color:red">
2	tag#id	div#myID { color:red; }
3	#id	.myID { color:red; }
4	tag.class	div.myClass { color:red; }
5	.class	.myClass { color:red; }
6	tag	div { color:red; }

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Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

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Capybara Actions

# Anchor
click_link 'Save'

# Button
click_button 'awesome'

# Both above

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#!/usr/bin/env ruby

# usage: saveimages.rb <url>
# locally save all images from a web site

require 'nokogiri'
require 'open-uri'

exit if ARGV[0].nil?