voldy

Ruby on Rails best practices

Code style

• Use UTF-8. It’s 21 century, 8bit encodings dead now.
• Use 2 space indent, not tabs
• Use Unix-style line endings
• Keep lines not longer than 80 chars
• Remove trailing whitespace

voldy

# Use the config/mongoid/#{rails_env}.yml file for mongoid config

namespace :mongoid do
  desc "Copy mongoid config"
  task :copy do
    upload "config/mongoid/#{rails_env}.yml", "#{shared_path}/mongoid.yml", :via => :scp
  end

  desc "Link the mongoid config in the release_path"
  task :symlink do

voldy

Useful Spacemacs commands

• SPC q q - quit
• SPC w / - split window vertically
• SPC w - - split window horizontally
• SPC 1 - switch to window 1
• SPC 2 - switch to window 2
• SPC w c - delete current window
• SPC TAB - switch to previous buffer
• SPC b b - switch buffers

voldy

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

voldy

#!/bin/bash -e

IFADDR="192.168.3.1/24"

if [[ ! ip link show docker0 ]]; then
  ip link add docker0 type bridge
  ip addr add "$IFADDR" dev docker0
  ip link set docker0 up
  iptables -t nat -A POSTROUTING -s "$IFADDR" ! -d "$IFADDR" -j MASQUERADE
fi

voldy

# /etc/init/project-web-reload.conf

pre-start script
  initctl restart project-web
  sleep 15
end script

exec /usr/local/rvm/bin/default_bluepill restart

voldy

!!! 5
%html
  %head
    %title= "Your Website"
    %meta{ :content => "", :name => "description" }
    %meta{ :content => "", :name => "author" }
    %meta{ :content => "3 days", :name => "revisit-after" }
    %link{ :href => "http://creativecommons.org/licenses/by/3.0/", :rel => "license", :title => "Creative Commons Attribution 3.0 Unported License" }
    %link{ :href => "/feed", :rel => "alternate", :title => "Atom", :type => "application/atom+xml" }
    %link{ :href => "/css/screen.css", :media => "screen", :rel => "stylesheet" }

voldy

# Note: This does not yet align 100% with out of the box devise. I will work on that.

Feature: Authentication
	In order to protect my assets stored within a system
	As any user
	I would like to be verified as the rightful owner of those assets through authentication
	
	Scenario: No authenticated user within the system
		Given a user exists with email: "someuser@someuser.com"
		And I am not authenticated

voldy

load "deploy" if respond_to?(:namespace) # cap2 differentiator

DEPLOYMENT_CONFIG = YAML.load_file("./config/config.yml")["production"]

# Ref: https://github.com/capistrano/capistrano/issues/81#issuecomment-1994285
require "bundler/capistrano"

# Uncomment if you are using Rails' asset pipeline
load "deploy/assets"

voldy

namespace :deploy do
  desc 'Bundle and minify the JS and CSS files'
  task :precache_assets, :roles => :app do
    root_path    = File.expand_path(File.dirname(__FILE__) + '/..')
    jammit_path  = Dir["#{root_path}/vendor/gems/jammit-*/bin/jammit"].first
    yui_lib_path = Dir["#{root_path}/vendor/gems/yui-compressor-*/lib"].first
    assets_path  = "#{root_path}/public/assets"

    # Precaching assets
    run_locally "ruby -I#{yui_lib_path} #{jammit_path}"