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How to set up your VPS with Chef Solo

1. What is it?

There are many different provisioning tools out there, the most popular of which are Chef and Puppet. Chef uses Ruby, Puppet uses a DSL (Domain Specific Language), there are others that use simple bash too, but today we're going to focus on Chef Solo.

2. Dependencies

To get Chef working properly on your local machine you need a few things.

Make sure you use Ruby 1.9.x and not Ruby 2.x as you will get errors with the json 1.6.1 gem on 2.x. Use rbenv or RVM to manage several different Rubies on the one machine.

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What is it?

Collection of concerns for your Rails application

Installation

Copy to your app/models/concerns directory

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# Use only in devise overriden controllers to ensure template inheritance.
# Appending resolver will try to find template in app/views/users/passwords/new 
# and it doesn't then it will fallback to app/views/devise/passwords/new
#
# ==== Usage
#
#   class Users::PasswordsController < ::Devise::PasswordsController
#     append_view_path DeviseResolver.new
#   end
#

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class DeviseMailer < ApplicationMailer
  include Devise::Mailers::Helpers

  def confirmation_instructions(record)
    devise_mail(record, :confirmation_instructions)
  end

  def reset_password_instructions(record)
    devise_mail(record, :reset_password_instructions)
  end

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# company_names = (1..15).map { Faker::Company.name }
company_names = %w[Design Marketing Branding Stores Mobile Desktop Software Hardware] # departments
data = (1..500).map do
  [ company_names.sample,
    name = Faker::Name.name,
    Faker::Internet.free_email(name.parameterize),
    Faker::Internet.user_name(name.parameterize),
    SecureRandom.urlsafe_base64(10).gsub('-', '') ]
end

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require 'open-uri'
require 'roo'

apple = Company.create! do |company|
  company.name = "Apple Inc."
  company.code = "AAPL"
  company.messages_url = "http://finance.yahoo.com/rss/headline?s=#{company.code}"
  company.stocks_url = "http://ichart.finance.yahoo.com/table.csv?s=#{company.code}"
end

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Killing Rails observers

• decreases startup time by not loading all your models
• makes it possible to preload config/environment.rb and still test models -> spin/zeus
• makes dependencies obvious
• replaces ActiveRecord magic with ruby
• makes your app Rails 4 ready

Before

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class Foo < ActiveRecord::Base
  attr_accessor :timestamp_control

  after_initialize { self.timestamp_control ||= Time.zone.now }
  
  before_validation :overwrite_check
  
  def overwrite_check
    errors[:base] << I18n.t('errors.messages.overwritten') if updated_at > timestamp_control
  end

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# Unobtrusive RESTful dynamic/dependent select menus for Ruby on Rails 3 and jQuery
#
# USAGE (with Formtastic):
#
# match   = form.object
# seasons = Season.all
# rounds  = match.season.nil? ? Array.new : match.season.rounds
#
# form.input :season, :as => :select, :collection => seasons, :include_blank => false, :prompt => true, :input_html => { :id => :season_id }
# form.input :round,  :as => :select, :collection => rounds,  :include_blank => false, :prompt => true, :input_html => { :id => :round_id,

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class String

  def to_bool
    case 
    when self == true || self =~ /^(true|t|yes|y|1)$/i
      true
    when self == false || self.blank? || self =~ /^(false|f|no|n|0)$/i
      false
    else
      raise ArgumentError.new "invalid value for Boolean: '#{self}'"