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

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

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

# config/initializers/hacks.rb

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

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

# Capistrano 2

before "deploy", "friday:good_luck"

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

exAspArk

ruby_print = ->(a, b = 28, c = 1) { puts ("ruby" * a).center(b) * c } ; [[2, 14, 2], [3, 14, 2], 7, 7, 7, 6, 5, 4, 3, 2, 1].map { |i| ruby_print.call(*i) }

   rubyruby      rubyruby
 rubyrubyruby  rubyrubyruby
rubyrubyrubyrubyrubyrubyruby
rubyrubyrubyrubyrubyrubyruby
rubyrubyrubyrubyrubyrubyruby
  rubyrubyrubyrubyrubyruby
    rubyrubyrubyrubyruby
      rubyrubyrubyruby

exAspArk

require "net/http"

def start_server
  # Remove the X to enable the parameters for tuning.
  # These are the default values as of Ruby 2.2.0.
  @child = spawn(<<-EOC.split.join(" "))
    XRUBY_GC_HEAP_FREE_SLOTS=4096
    XRUBY_GC_HEAP_INIT_SLOTS=10000
    XRUBY_GC_HEAP_GROWTH_FACTOR=1.8
    XRUBY_GC_HEAP_GROWTH_MAX_SLOTS=0

exAspArk

# The same algorithm which is used in Google Analytics (https://support.google.com/analytics/answer/2731565?hl=en):
# Time-based expiry (including end of day):
# - After 30 minutes of inactivity
# - At midnight

# Enable dynamic scripting for Groovy (https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting.html#_enabling_dynamic_scripting)
# ! WARNING: please read about security first

# Usage:
#

exAspArk

ssh login@server.example.com -t "screen -DR session_name"

tmux -CC attach -t session_name || tmux -CC new -s session_name