stevecass

class Post < ActiveRecord::Base
  has_many :comments, as: :commentable
end

class Photo < ActiveRecord::Base
  has_many :comments, as: :commentable
end

class Comment < ActiveRecord::Base
  belongs_to :commentable, polymorphic: true

stevecass

import UIKit

let nonOptionalVar: [String] = ["a", "b", "c"]
let optionalVar:String? = "jimmy"

// this compiles OK with import UIKit present
let ex1: [String: AnyObject] = ["key" : nonOptionalVar, "notherkey": ["content": optionalVar!]]

// Here we forget the ! character that unwraps the optional
// error: contextual type 'AnyObject' cannot be used with dictionary literal

stevecass

<key>NSAppTransportSecurity</key>
  <dict>
    <!--Include to allow all connections (DANGER)-->
    <key>NSAllowsArbitraryLoads</key>
    <true/>
  </dict>

stevecass

Moving to Rails from Sinatra

Helpers

Helper methods in rails are used only in views, not controllers. If you want to make a method available to multiple controllers, you can declare it in the ApplicationController, which is the base class for all your controllers. If you want the method to be visible to views, declare it as a helper_method.

http://api.rubyonrails.org/classes/AbstractController/Helpers/ClassMethods.html#method-i-helper_method

stevecass

# Model files

class Match < ActiveRecord::Base
  belongs_to :source, foreign_key: 'from_id', class_name: Personality
  belongs_to :target, foreign_key: 'to_id', class_name: Personality
end

class Person < ActiveRecord::Base
  belongs_to :personality

stevecass

// ES 6 basics

setTimeout(() => {
  console.log('Hello');
  console.log('Goodbye');
}, 200);

// One - liners can omit the { }
// and implicitly return the value of their statement
setTimeout(() => 5, 200)

stevecass

//variables declared in global scope become properties of the window in browser environments
var a = 123;
console.log('a', window.a);

// functions introduce scope. A variable declared inside a function is not visible outside
function f() {
  var b = 456;
  console.log('b', b);
  // inside the function we can still see the global a. We don't need "window." - it's implied
  console.log('a', a);

stevecass

Moving to Rails from Sinatra

Helpers

Helper methods in rails are used only in views, not controllers. If you want to make a method available to multiple controllers, you can declare it in the ApplicationController, which is the base class for all your controllers. If you want the method to be visible to views, declare it as a helper_method.

http://api.rubyonrails.org/classes/AbstractController/Helpers/ClassMethods.html#method-i-helper_method

stevecass

##Letting Your ActiveRecord Associations Help

Suppose you have the following models:

class User < ActiveRecord::Base
  has_many :blogs
  has_many :posts, through: :blogs
  has_many :received_comments, through: :posts, source: :comments
  has_many :expressed_comments, class_name: 'Comment', foreign_key: 'user_id'

stevecass

(function(){

  var loadFirstNumber = function(){
    return new Promise(function(resolve, reject){
      var request = $.ajax({
        method: 'get',
        url:'/first.json',
      })
      request.done(function(result){
        resolve(result.value);