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Note 1.

Single Table Inheritance 
http://api.rubyonrails.org/classes/ActiveRecord/Base.html

class Teacher < User
  has_many :courses
end

class Course 

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DATES = ["2012-01-01",
  "2012-02-01",
  "2012-03-01",
  "2012-04-01",
  "2012-05-01",
  "2012-06-01",
  "2012-07-01",
  "2012-08-01",
  "2012-09-01",
  "2012-10-01",

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#!/usr/bin/env ruby

require 'rubygems'
require 'gattica'

# Login
ga = Gattica.new({
    :email => '',
    :password => ''
})

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#!/usr/bin/env ruby

# encoding: utf-8

# ======================================================
# <N+1 problem>
#
# Post.all.each do |p|
#   puts p.category.name
# end

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unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

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#!/usr/bin/env ruby

# encoding: utf-8

# ======================================================
# <N+1 problem>
#
# Post.all.each do |p|
#   puts p.category.name
# end

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# Despite the added complexity, method_missing is a powerful tool that needs to be used when the interface of a class cannot be predetermined.
# Use Isolate Dynamic Receptor to move the method_missing behavior to a new class: a class whose sole responsibility is to handle the method_missing cases.

class MessageCollector
  instance_methods.each do |meth|
    undef_method meth unless meth =~ /^(__|inspect)/
  end

  def messages
    @messages ||= []

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class Decorator
  def initialize(subject)
    @subject = subject
  end

  def method_missing(sym, *args, &block)
    @subject.send sym, *args, &block
  end
end

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module CustomInitializers
  def hash_initializer(*attribute_names)
    define_method(:initialize) do |*args|
      data = args.first
      attribute_names.each do |attr|
        instance_variable_set "@#{attr}", data[attr]
      end
    end

    self.class_eval do

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#!/usr/bin/env ruby

require 'mongoid'
require 'mongoid/support/query_counter'

Mongoid.configure.connect_to("mongoid_test")

def count_queries(&block)
  query_counter = Mongoid::QueryCounter.new
  query_counter.instrument(&block)