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# db/migrate/20131118172653_create_transactional_items_view.rb
class CreateTransactionalItemsView < ActiveRecord::Migration
  def up
    select_sql = File.open("#{Rails.root}/db/migrate/20131118172653_create_transactional_items_view.sql", 'r') { |f| f.read } 
    
    # for materialized view:
    view_sql = "CREATE MATERIALIZED VIEW transactional_items AS (#{select_sql})"
    # for normal view:
    view_sql = "CREATE VIEW transactional_items AS (#{select_sql})"
    

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Senior (enterprise)

    Analyse and profile an application for performance and memory issues
    Analyses and profile an application for security issues
    Understand database modeling and query analysis
    Tune a production deployment (Passenger, Thin, Apache etc)
    Understand and use Ruby metaprogramming
    Mentoring skills
    Communication skills
    Planning and Estimation

romansklenar

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