exAspArk

# Capistrano 2

before "deploy", "friday:good_luck"

namespace :friday do
  friday_jumper = %{
┓┏┓┏┓┃
┛┗┛┗┛┃⟍ ○⟋
┓┏┓┏┓┃  ∕       Friday
┛┗┛┗┛┃ノ)

exAspArk

# HACK to enable using protected methods from Rails 4.2 and initial states as default attributes for ActiveRecord
module StateMachine
  module Integrations
    module ActiveModel
      public :around_validation
    end

    module ActiveRecord
      public :around_save

exAspArk

# config/initializers/hacks.rb

Dir[Rails.root.join("lib/hacks/**/*.rb")].each { |file| require file }

exAspArk

def deep_merge(hash1, hash2)
  result = hash1.dup

  hash2.keys.each do |key|
    if hash2[key].is_a?(Hash) && hash1[key].is_a?(Hash)
      result[key] = deep_merge(hash1[key], hash2[key])
    else
      result[key] = hash2[key]
    end
  end

exAspArk

require "timeout"

module WaitSteps
  extend RSpec::Matchers::DSL

  matcher :become_true do
    match do |block|
      begin
        Timeout.timeout(Capybara.default_wait_time) do
          sleep(0.1) until value = block.call

exAspArk

Commands examples

If the namespace is not used then the commands will perform on top of the default database.

  bundle exec rake db:create
  bundle exec rake db:migrate 

By using the namespace we are going to use all the configuration for our alternate DB.

exAspArk

  def nested_symbolize_keys(thing)
    case thing
    when Array
      thing.map { |value| nested_symbolize_keys(value) }
    when Hash
      Hash[thing.map { |key, value| [key.to_sym, nested_symbolize_keys(value)] }]
    else
      thing
    end
  end

exAspArk

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
• The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
• Scaling Twitter: Making Twitter 10000 Percent Faster

exAspArk

RSpec.configure do |config|
  config.before(:suite) do
    DatabaseCleaner.clean_with(:truncation)
  end

  config.before(:each) do
    DatabaseCleaner.strategy = :transaction
  end

  config.before(:each, js: true) do

exAspArk

Docker Cheat Sheet

Why

Why Should I Care (For Developers)

"Docker interests me because it allows simple environment isolation and repeatability. I can create a run-time environment once, package it up, then run it again on any other machine. Furthermore, everything that runs in that environment is isolated from the underlying host (much like a virtual machine). And best of all, everything is fast and simple."

TL;DR, I just want a dev environment