6.2 Iteration A2: Making Prettier Listings 2 Instant Gratification

This section mostly covers database configuration options for those users that insist on using MySQL. SQLite3 users will skip most of it.

Create the application.

bundle exec /home/rubys/git/rails/railties/exe/rails new depot --skip-bundle --skip-listen

      create  

      create  README.md

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/assets/config/manifest.js

      create  app/assets/javascripts/application.js

      create  app/assets/javascripts/cable.js

      create  app/assets/stylesheets/application.css

      create  app/channels/application_cable/channel.rb

      create  app/channels/application_cable/connection.rb

      create  app/controllers/application_controller.rb

      create  app/helpers/application_helper.rb

      create  app/jobs/application_job.rb

      create  app/mailers/application_mailer.rb

      create  app/models/application_record.rb

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

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

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

      create  app/assets/images/.keep

      create  app/assets/javascripts/channels

      create  app/assets/javascripts/channels/.keep

      create  app/controllers/concerns/.keep

      create  app/models/concerns/.keep

      create  bin

      create  bin/bundle

      create  bin/rails

      create  bin/rake

      create  bin/setup

      create  bin/update

      create  config

      create  config/routes.rb

      create  config/application.rb

      create  config/environment.rb

      create  config/secrets.yml

      create  config/cable.yml

      create  config/puma.rb

      create  config/spring.rb

      create  config/environments

      create  config/environments/development.rb

      create  config/environments/production.rb

      create  config/environments/test.rb

      create  config/initializers

      create  config/initializers/application_controller_renderer.rb

      create  config/initializers/assets.rb

      create  config/initializers/backtrace_silencers.rb

      create  config/initializers/cookies_serializer.rb

      create  config/initializers/cors.rb

      create  config/initializers/filter_parameter_logging.rb

      create  config/initializers/inflections.rb

      create  config/initializers/mime_types.rb

      create  config/initializers/new_framework_defaults.rb

      create  config/initializers/session_store.rb

      create  config/initializers/wrap_parameters.rb

      create  config/locales

      create  config/locales/en.yml

      create  config/boot.rb

      create  config/database.yml

      create  db

      create  db/seeds.rb

      create  lib

      create  lib/tasks

      create  lib/tasks/.keep

      create  lib/assets

      create  lib/assets/.keep

      create  log

      create  log/.keep

      create  public

      create  public/404.html

      create  public/422.html

      create  public/500.html

      create  public/apple-touch-icon-precomposed.png

      create  public/apple-touch-icon.png

      create  public/favicon.ico

      create  public/robots.txt

      create  test/fixtures

      create  test/fixtures/.keep

      create  test/fixtures/files

      create  test/fixtures/files/.keep

      create  test/controllers

      create  test/controllers/.keep

      create  test/mailers

      create  test/mailers/.keep

      create  test/models

      create  test/models/.keep

      create  test/helpers

      create  test/helpers/.keep

      create  test/integration

      create  test/integration/.keep

      create  test/test_helper.rb

      create  tmp

      create  tmp/.keep

      create  tmp/cache

      create  tmp/cache/assets

      create  vendor/assets/javascripts

      create  vendor/assets/javascripts/.keep

      create  vendor/assets/stylesheets

      create  vendor/assets/stylesheets/.keep

      remove  config/initializers/cors.rb

bundle install --local

Resolving dependencies...

Using rake 12.0.0

Using concurrent-ruby 1.0.5

Using i18n 0.8.1

Using minitest 5.8.5

Using thread_safe 0.3.6

Using builder 3.2.3

Using erubis 2.7.0

Using mini_portile2 2.1.0

Using rack 2.0.1

Using nio4r 2.0.0

Using websocket-extensions 0.1.2

Using mime-types-data 3.2016.0521

Using arel 7.1.4

Using bundler 1.14.6

Using byebug 9.0.6

Using coffee-script-source 1.12.2

Using execjs 2.7.0

Using method_source 0.8.2

Using thor 0.19.4

Using debug_inspector 0.0.2

Using ffi 1.9.18

Using multi_json 1.12.1

Using pg 0.19.0

Using puma 3.8.2

Using sass 3.4.23

Using tilt 2.0.7

Using sqlite3 1.3.13

Using turbolinks-source 5.0.0

Using tzinfo 1.2.3

Using nokogiri 1.7.1

Using rack-test 0.6.3

Using sprockets 3.7.1

Using websocket-driver 0.6.5

Using mime-types 3.1

Using coffee-script 2.4.1

Using uglifier 3.1.10

Using rb-inotify 0.9.7 from source at `/home/rubys/git/rb-inotify`

Using queue_classic 3.2.0.RC1 from source at `/home/rubys/git/queue_classic`

Using turbolinks 5.0.1

Using activesupport 5.0.2 from source at `/home/rubys/git/rails`

Using loofah 2.0.3

Using mail 2.6.4

Using rails-dom-testing 2.0.2

Using globalid 0.3.7

Using activemodel 5.0.2 from source at `/home/rubys/git/rails`

Using jbuilder 2.6.3

Using spring 2.0.1

Using rails-html-sanitizer 1.0.3

Using activejob 5.0.2 from source at `/home/rubys/git/rails`

Using activerecord 5.0.2 from source at `/home/rubys/git/rails`

Using actionview 5.0.2 from source at `/home/rubys/git/rails`

Using actionpack 5.0.2 from source at `/home/rubys/git/rails`

Using actioncable 5.0.2 from source at `/home/rubys/git/rails`

Using actionmailer 5.0.2 from source at `/home/rubys/git/rails`

Using railties 5.0.2 from source at `/home/rubys/git/rails`

Using sprockets-rails 3.2.0

Using coffee-rails 4.2.1

Using jquery-rails 4.3.1

Using web-console 3.4.0 from source at `/home/rubys/git/web-console`

Using rails 5.0.2 from source at `/home/rubys/git/rails`

Using sass-rails 5.0.6

Bundle complete! 15 Gemfile dependencies, 61 gems now installed.

Use `bundle show [gemname]` to see where a bundled gem is installed.

Look at the files created.

ls -p

app/  config/	 db/	  Gemfile.lock	log/	 Rakefile   test/  vendor/

bin/  config.ru  Gemfile  lib/		public/  README.md  tmp/

Generate scaffolding for a real model, modify a template, and do our first bit of data entry.

Generating our first model and associated scaffolding

rails generate scaffold Product title:string description:text image_url:string price:decimal

      invoke  active_record

      create    db/migrate/20170326074039_create_products.rb

      create    app/models/product.rb

      invoke    test_unit

      create      test/models/product_test.rb

      create      test/fixtures/products.yml

      invoke  resource_route

       route    resources :products

      invoke  scaffold_controller

      create    app/controllers/products_controller.rb

      invoke    erb

      create      app/views/products

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

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

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

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

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

      invoke    test_unit

      create      test/controllers/products_controller_test.rb

      invoke    helper

      create      app/helpers/products_helper.rb

      invoke      test_unit

      invoke    jbuilder

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

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

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

      invoke  assets

      invoke    coffee

      create      app/assets/javascripts/products.coffee

      invoke    scss

      create      app/assets/stylesheets/products.scss

      invoke  scss

      create    app/assets/stylesheets/scaffolds.scss

Break lines for formatting reasons

edit app/controllers/products_controller.rb

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(:title, :description, :image_url, :price)

    end

end

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

<p id="notice"><%= notice %></p>

<h1>Products</h1>

<table>

  <thead>

    <tr>

      <th>Title</th>

      <th>Description</th>

      <th>Image url</th>

      <th>Price</th>

      <th colspan="3"></th>

    </tr>

  </thead>

  <tbody>

    <% @products.each do |product| %>

      <tr>

        <td><%= product.title %></td>

        <td><%= product.description %></td>

        <td><%= product.image_url %></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 %>

Add precision and scale to the price

edit db/migrate/20170326074039_create_products.rb

class CreateProducts < ActiveRecord::Migration[5.0]

  def change

    create_table :products do |t|

      t.string :title

      t.text :description

      t.string :image_url

      t.decimal :price, precision: 8, scale: 2

      t.timestamps

    end

  end

end

Apply the migration

rails db:migrate

mv 20170326074039_create_products.rb 20170326000001_create_products.rb

== 20170326000001 CreateProducts: migrating ===================================

-- create_table(:products)

   -> 0.0008s

== 20170326000001 CreateProducts: migrated (0.0009s) ==========================

Restart the server.

Get an (empty) list of products

get /products

Show (and modify) one of the templates produced

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

<%= form_for(product) do |f| %>

  <% 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">

    <%= f.label :title %>

    <%= f.text_field :title %>

  </div>

  <div class="field">

    <%= f.label :description %>

    <%= f.text_area :description, rows: 10, cols: 60 %>

  </div>

  <div class="field">

    <%= f.label :image_url %>

    <%= f.text_field :image_url %>

  </div>

  <div class="field">

    <%= f.label :price %>

    <%= f.text_field :price %>

  </div>

  <div class="actions">

    <%= f.submit %>

  </div>

<% end %>

Create a product

get /products/new

post /products

• product[title] => Seven Mobile Apps in Seven Weeks
• product[description] => <p> <em>Native Apps, Multiple Platforms</em> Answer the question “Can we build this for ALL the devices?” with a resounding YES. This book will help you get there with a real-world introduction to seven platforms, whether you’re new to mobile or an experienced developer needing to expand your options. Plus, you’ll find out which cross-platform solution makes the most sense for your needs. </p>
• product[price] => 29.00
• product[image_url] => 7apps.jpg

get http://localhost:3000/products/1

Verify that the product has been added

get /products

And, just to verify that we haven't broken anything

rails test

Run options: --seed 35900

# Running:

.......

Finished in 0.650228s, 10.7654 runs/s, 13.8413 assertions/s.

7 runs, 9 assertions, 0 failures, 0 errors, 0 skips

6.2 Iteration A2: Making Prettier Listings 2 Instant Gratification