First commit

example/app/assets/config/manifest.js

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+//= link_tree ../images
+//= link_directory ../javascripts .js
+//= link_directory ../stylesheets .css

example/app/assets/javascripts/application.js

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+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, or any plugin's
+// vendor/assets/javascripts directory can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file. JavaScript code in this file should be added after the last require_* statement.
+//
+// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//= require rails-ujs
+//= require activestorage
+//= require turbolinks
+//= require_tree .

example/app/assets/javascripts/cable.js

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+// Action Cable provides the framework to deal with WebSockets in Rails.
+// You can generate new channels where WebSocket features live using the `rails generate channel` command.
+//
+//= require action_cable
+//= require_self
+//= require_tree ./channels
+
+(function() {
+  this.App || (this.App = {});
+
+  App.cable = ActionCable.createConsumer();
+
+}).call(this);

example/app/assets/javascripts/products.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

example/app/assets/stylesheets/application.css

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+/*
+ * This is a manifest file that'll be compiled into application.css, which will include all the files
+ * listed below.
+ *
+ * Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
+ * vendor/assets/stylesheets directory can be referenced here using a relative path.
+ *
+ * You're free to add application-wide styles to this file and they'll appear at the bottom of the
+ * compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
+ * files in this directory. Styles in this file should be added after the last require_* statement.
+ * It is generally better to create a new file per style scope.
+ *
+ *= require_tree .
+ *= require_self
+ */

example/app/assets/stylesheets/products.scss

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+// Place all the styles related to the products controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

example/app/assets/stylesheets/scaffolds.scss

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+body {
+  background-color: #fff;
+  color: #333;
+  margin: 33px;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+p, ol, ul, td {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+pre {
+  background-color: #eee;
+  padding: 10px;
+  font-size: 11px;
+}
+
+a {
+  color: #000;
+
+  &:visited {
+    color: #666;
+  }
+
+  &:hover {
+    color: #fff;
+    background-color: #000;
+  }
+}
+
+th {
+  padding-bottom: 5px;
+}
+
+td {
+  padding: 0 5px 7px;
+}
+
+div {
+  &.field, &.actions {
+    margin-bottom: 10px;
+  }
+}
+
+#notice {
+  color: green;
+}
+
+.field_with_errors {
+  padding: 2px;
+  background-color: red;
+  display: table;
+}
+
+#error_explanation {
+  width: 450px;
+  border: 2px solid red;
+  padding: 7px 7px 0;
+  margin-bottom: 20px;
+  background-color: #f0f0f0;
+
+  h2 {
+    text-align: left;
+    font-weight: bold;
+    padding: 5px 5px 5px 15px;
+    font-size: 12px;
+    margin: -7px -7px 0;
+    background-color: #c00;
+    color: #fff;
+  }
+
+  ul li {
+    font-size: 12px;
+    list-style: square;
+  }
+}
+
+label {
+  display: block;
+}

example/app/channels/application_cable/channel.rb

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+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

example/app/channels/application_cable/connection.rb

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+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

example/app/controllers/application_controller.rb

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+class ApplicationController < ActionController::Base
+  before_action :authenticate_user!
+end

example/app/controllers/products_controller.rb

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+class ProductsController < ApplicationController
+  before_action :set_product, only: [:show, :edit, :update, :destroy]
+
+  # GET /products
+  # GET /products.json
+  def index
+    @products = Product.all
+  end
+
+  # GET /products/1
+  # GET /products/1.json
+  def show
+  end
+
+  # GET /products/new
+  def new
+    @product = Product.new
+  end
+
+  # GET /products/1/edit
+  def edit
+  end
+
+  # POST /products
+  # POST /products.json
+  def create
+    @product = Product.new(product_params)
+
+    respond_to do |format|
+      if @product.save
+        format.html { redirect_to @product, notice: 'Product was successfully created.' }
+        format.json { render :show, status: :created, location: @product }
+      else
+        format.html { render :new }
+        format.json { render json: @product.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /products/1
+  # PATCH/PUT /products/1.json
+  def update
+    respond_to do |format|
+      if @product.update(product_params)
+        format.html { redirect_to @product, notice: 'Product was successfully updated.' }
+        format.json { render :show, status: :ok, location: @product }
+      else
+        format.html { render :edit }
+        format.json { render json: @product.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /products/1
+  # DELETE /products/1.json
+  def destroy
+    @product.destroy
+    respond_to do |format|
+      format.html { redirect_to products_url, notice: 'Product was successfully destroyed.' }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_product
+      @product = Product.find(params[:id])
+    end
+
+    # Never trust parameters from the scary internet, only allow the white list through.
+    def product_params
+      params.require(:product).permit(:name, :description, :price)
+    end
+end

example/app/helpers/application_helper.rb

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+module ApplicationHelper
+end

example/app/helpers/products_helper.rb

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+module ProductsHelper
+end

example/app/jobs/application_job.rb

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+class ApplicationJob < ActiveJob::Base
+end

example/app/mailers/application_mailer.rb

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+class ApplicationMailer < ActionMailer::Base
+  default from: 'from@example.com'
+  layout 'mailer'
+end

example/app/models/application_record.rb

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+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end

example/app/models/customer.rb

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+class Customer < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
+
+  has_many :products, through: :purchases
+end

example/app/models/product.rb

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+class Product < ApplicationRecord
+  has_many :customers, through: :purchases
+end

example/app/models/purchase.rb

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+class Purchase < ApplicationRecord
+  validates :sale_type, :inclusion => { :in => %w{rented bought} }
+  validates :quantity, numericality: { greater_than: 0 }
+end

example/app/models/user.rb

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+class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
+  
+  has_many :products
+end

example/app/views/layouts/application.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>App</title>
+    <%= csrf_meta_tags %>
+    <%= csp_meta_tag %>
+
+    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
+    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

example/app/views/layouts/mailer.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <style>
+      /* Email styles need to be inline */
+    </style>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

example/app/views/layouts/mailer.text.erb

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+<%= yield %>

example/app/views/products/_form.html.erb

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+<%= form_with(model: product, local: true) do |form| %>
+  <% if product.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(product.errors.count, "error") %> prohibited this product from being saved:</h2>
+
+      <ul>
+      <% product.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= form.label :name %>
+    <%= form.text_field :name %>
+  </div>
+
+  <div class="field">
+    <%= form.label :description %>
+    <%= form.text_area :description %>
+  </div>
+
+  <div class="field">
+    <%= form.label :price %>
+    <%= form.text_field :price %>
+  </div>
+
+  <div class="actions">
+    <%= form.submit %>
+  </div>
+<% end %>

example/app/views/products/_product.json.jbuilder

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+json.extract! product, :id, :name, :description, :price, :created_at, :updated_at
+json.url product_url(product, format: :json)

example/app/views/products/edit.html.erb

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+<h1>Editing Product</h1>
+
+<%= render 'form', product: @product %>
+
+<%= link_to 'Show', @product %> |
+<%= link_to 'Back', products_path %>

example/app/views/products/index.html.erb

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+<p id="notice"><%= notice %></p>
+
+<h1>Products</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Description</th>
+      <th>Price</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @products.each do |product| %>
+      <tr>
+        <td><%= product.name %></td>
+        <td><%= product.description %></td>
+        <td><%= product.price %></td>
+        <td><%= link_to 'Show', product %></td>
+        <td><%= link_to 'Edit', edit_product_path(product) %></td>
+        <td><%= link_to 'Destroy', product, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Product', new_product_path %>

example/app/views/products/index.json.jbuilder

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+json.array! @products, partial: 'products/product', as: :product

example/app/views/products/new.html.erb

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+<h1>New Product</h1>
+
+<%= render 'form', product: @product %>
+
+<%= link_to 'Back', products_path %>

example/app/views/products/show.html.erb

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+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Name:</strong>
+  <%= @product.name %>
+</p>
+
+<p>
+  <strong>Description:</strong>
+  <%= @product.description %>
+</p>
+
+<p>
+  <strong>Price:</strong>
+  <%= @product.price %>
+</p>
+
+<%= link_to 'Edit', edit_product_path(@product) %> |
+<%= link_to 'Back', products_path %>

example/app/views/products/show.json.jbuilder

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+json.partial! "products/product", product: @product