armandofox

class EmailList
  attr_reader :mailer
  delegate :send_email, :to => :mailer
  def initialize(mailer_type)
    @mailer = mailer_type.new
  end
end
# in RottenPotatoes EmailListController:
def advertise_discount_for_movie
  moviegoers = Moviegoer.interested_in params[:movie_id]

armandofox

# This example is adapted from Dan Manges's blog, dcmanges.com
class Wallet ; attr_accessor :credit_balance ; end
class Moviegoer
  attr_accessor :wallet
  def initialize
    # ...setup wallet attribute with correct credit balance
  end
end
class MovieTheater
  def collect_money(moviegoer, due_amount)

armandofox

# Better: delegate credit_balance so MovieTheater only accesses Moviegoer
class Moviegoer
  def credit_balance
    self.wallet.credit_balance  # delegation
  end
end
class MovieTheater
  def collect_money(moviegoer,due_amount)
    if moviegoer.credit_balance >= due_amount
      moviegoer.credit_balance -= due_amount

armandofox

<h1>Details about <%= @movie.title %></h1>

<div id="metadata">
  <ul id="details">
    <li> Rating: <%= @movie.rating %> </li>
    <li> Released on: <%= @movie.release_date.strftime('%F') %> </li>
  </ul>
</div>

<div id="description">

armandofox

class MoviesController < ApplicationController
  # 'index' and 'show' methods from Section 4.4 omitted for clarity
  def new
    @movie = Movie.new
  end 
  def create
    if (@movie = Movie.create(movie_params))
      redirect_to movies_path, :notice => "#{@movie.title} created."
    else
      flash[:alert] = "Movie #{@movie.title} could not be created: " +

armandofox

class Movie < ActiveRecord::Base
  def self.all_ratings ; %w[G PG PG-13 R NC-17] ; end #  shortcut: array of strings
  validates :title, :presence => true
  validates :release_date, :presence => true
  validate :released_1930_or_later # uses custom validator below
  validates :rating, :inclusion => {:in => Movie.all_ratings},
    :unless => :grandfathered?
  def released_1930_or_later
    errors.add(:release_date, 'must be 1930 or later') if
      release_date && release_date < Date.parse('1 Jan 1930')

armandofox

<h1> New Review for <%= @movie.title %> </h1>

<%= form_tag movie_review_path(@movie), class: 'form' do %>
  <label class="col-form-label"> How many potatoes:</label>
  <%= select_tag 'review[potatoes]', options_for_select(1..5), class: 'form-control' %>
  <%= submit_tag 'Create Review', :class => 'btn btn-success' %>
<% end %>

armandofox

# it would be nice if we could do this:
inception = Movie.where(:title => 'Inception')
alice,bob = Moviegoer.find(alice_id, bob_id)
# alice likes Inception, bob less so
alice_review = Review.new(:potatoes => 5)
bob_review   = Review.new(:potatoes => 3)
# a movie has many reviews:
inception.reviews = [alice_review, bob_review]
# a moviegoer has many reviews:
alice.reviews << alice_review

armandofox

# in moviegoer.rb:
class Moviegoer
  has_many :reviews
  has_many :movies, :through => :reviews
  # ...other moviegoer model code
end
alice = Moviegoer.where(:name => 'Alice')
alice_movies = alice.movies
# MAY work, but a bad idea - see caption:
alice.movies << Movie.where(:title => 'Inception') # Don't do this!

armandofox

require "stripe"      # makes gem's definitions available within this file
Stripe.api_key = "sk_test_4eC39HqLyjWDarjtT1zdp7dc"
Stripe::Charge.create({
  :amount => 2000,
  :currency => "usd",
  :source => "tok_mastercard", # obtained with Stripe.js
  :description => "Charge for [email protected]"
  })