vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

paulallies

#add 'node_modules' to .gitignore file

git rm -r --cached node_modules
git commit -m 'Remove the now ignored directory node_modules'
git push origin <branch-name>

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

dtakahas

class Babby < PragnentGirl::GetPragnent

  attr_accessible :name, :mother, :location, :pragnent_girl_id

  belongs_to :pragnent_girl
  
  before_save :destroy_instain_mothers
  after_save :pary_for_father
  
  #How is babby formed?

brookr

A: # If using naked domain redirects via Google
216.239.32.21
216.239.34.21
216.239.36.21
216.239.38.21

MX: # If using Google Mail
1 ASPMX.L.GOOGLE.COM.
5 ALT1.ASPMX.L.GOOGLE.COM.
5 ALT2.ASPMX.L.GOOGLE.COM.

davidmfoley

#! /bin/bash
# First you need to have the "pgbackups" addon in your heroku app, for example:
# $ heroku addons:add pgbackups:auto-week

# your database name here
DB_NAME='foobar_development'

# grab the data directory for postgres from the running process
DATA_DIR=`ps ax |grep [/]post | sed "s/^.*\-D //" | sed "s/ .*$//"`

HenrikJoreteg

// grab your file object from a file input
$('#fileInput').change(function () {
  sendFile(this.files[0]);
});

// can also be from a drag-from-desktop drop
$('dropZone')[0].ondrop = function (e) {
  e.preventDefault();
  sendFile(e.dataTransfer.files[0]);
};

ingeniarius

require 'rubygems'
require 'nokogiri'
require 'eeepub'

DOC_TITLE = 'Ruby on Rails Guides'

def get_pages(src_dir)
  index_file = File.join(src_dir, 'index.html') 
  section = nil
  pages = [{ :section => section, :title => DOC_TITLE, :path => index_file }]

the-architect

class Contact < ActiveRecord::Base
  
  state_machine :state, :initial => :imported do
    state :imported
    state :contacted
    state :verified
    state :prospect
    state :deleted
  end

tonywok

s = Test.new(:name => "foo")

# ActiveRecord::Test after_initialize
# ActiveRecord::Test after_initialize, :on => :update
# ActiveRecord::Test after_initialize, :on => :create
# ActiveRecord::TestObserver after_initialize

# ===> #<Test id: nil, name: "foo", created_at: nil, updated_at: nil>