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# Shoulda activemodel cheatsheet

# DB
should have_db_column(:title).of_type(:string).with_options(default: 'Untitled', null: false)
should have_db_index(:email).unique(:true)

# Associations
should belong_to :company
should have_one(:profile).dependent(:destroy)
should have_many(:posts).dependent(:nullify)

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includes(:answers)
.where("user_id IS NULL OR user_id != ?", user_id)

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require 'minitest/autorun'
require 'mocha/setup'
require './lib/dice'

class DiceTest < MiniTest::Unit::TestCase

  def setup
    @one_dice = Dice.new(1)
    @two_dice = Dice.new(2)
  end

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- Copy setup.zip to your Downloads folder


- Double click the folder to unzip the folder


- Open the folder, and then once inside:

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#create your own methods
#create a method with one argument, and print it out
#create a method with two arguments 
#create a method with one argument, which by default is nil
#create a method that returns two values, depending on if an argument is true or false

#take this hash, and use it to make this string. Make sure you use the hash twice, 
#and use string interpolation i.e. "A string #{variable}"

hash = {:dario => "Dario", :leo => "Leo"}

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def do_some_maths
  puts yield(10)
  puts yield(20)
end

do_some_maths do |num|
  num * 20
end

do_some_maths do |number|

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#  You can loop through a range
(1..10).each {|a| puts a }

first_ten = (1..10).to_a

#  You can convert it into an array
puts first_ten.inspect

puts "selecting odd numbers"

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def vader(evil = false)
  #  guard clause
  return "something else" if evil == "luke"

  #  implicit return, last line executed
  if evil
    "i am your father and I hate you"
  else
    "i am your father and i love you"
  end

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The Ruby universe

This is a brief introduction into the world of web development and Ruby. To view all the different gems listed by popularity check out the Ruby Toolbox.

Web frameworks

• Rails - the most popular, although recently has been criticised for being a bit bloated - giving you more than you often need to build a simple web site
• Sinatra - takes the opposite principal, more of a "micro framework" that starts with just enough to get you going, and you can then add Gems for more advanced stuff as and when you need it

Models

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Sublime Text 2

Although you're free to use any editor we recommend Sublime. Here's how to get the most out of it

Setting up

Once you've installed Sublime there's a few things you should do to get things set up properly:

Package Control