6.2 Iteration A2: Making Prettier Listings 2 Instant Gratification

6.1 Iteration A1: Creating the Products Maintenance Application

</\d+ (test|run)s, \d+ assertions, 0 failures, 0 errors/> expected to be =~
<"<pre class=\"stderr\">rake aborted!</pre>">.

Traceback:
  /home/rubys/git/awdwr/edition4/checkdepot.rb:70:in `block (3 levels) in <class:DepotTest>'
  /home/rubys/git/awdwr/edition4/checkdepot.rb:69:in `each'
  /home/rubys/git/awdwr/edition4/checkdepot.rb:69:in `block (2 levels) in <class:DepotTest>'
  /home/rubys/git/rails/actionpack/lib/action_dispatch/testing/assertions/selector.rb:305:in `assert_select'
  /home/rubys/git/awdwr/edition4/checkdepot.rb:67:in `block in <class:DepotTest>'

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/bin/rails new depot --skip-bundle

      create

      create  README.rdoc

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/assets/javascripts/application.js

      create  app/assets/stylesheets/application.css

      create  app/controllers/application_controller.rb

      create  app/helpers/application_helper.rb

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

      create  app/assets/images/.keep

      create  app/mailers/.keep

      create  app/models/.keep

      create  app/controllers/concerns/.keep

      create  app/models/concerns/.keep

      create  bin

      create  bin/bundle

      create  bin/rails

      create  bin/rake

      create  config

      create  config/routes.rb

      create  config/application.rb

      create  config/environment.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/backtrace_silencers.rb

      create  config/initializers/filter_parameter_logging.rb

      create  config/initializers/inflections.rb

      create  config/initializers/mime_types.rb

      create  config/initializers/secret_token.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/favicon.ico

      create  public/robots.txt

      create  test/fixtures

      create  test/fixtures/.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/cache

      create  tmp/cache/assets

      create  vendor/assets/javascripts

      create  vendor/assets/javascripts/.keep

      create  vendor/assets/stylesheets

      create  vendor/assets/stylesheets/.keep

bundle install --local

Resolving dependencies...

Using rake 11.2.1

Using i18n 0.7.0

Using minitest 4.7.5

Using multi_json 1.12.1

Using thread_safe 0.3.5

Using tzinfo 0.3.49

Using builder 3.1.4

Using erubis 2.7.0

Using rack 1.5.5

Using mime-types-data 3.2016.0521

Using activerecord-deprecated_finders 1.0.4

Using arel 4.0.2.20140205180311 from source at `/home/rubys/git/arel`

Using bundler 1.12.5

Using coffee-script-source 1.10.0

Using execjs 2.7.0

Using thor 0.19.1

Using hike 1.2.3

Using json 1.8.3

Using tilt 1.4.1

Using sass 3.2.19

Using sqlite3 1.3.11

Using activesupport 4.0.13 from source at `/home/rubys/git/rails`

Using rack-test 0.6.3

Using mime-types 3.1

Using coffee-script 2.4.1

Using uglifier 3.0.0

Using rdoc 4.2.2

Using sprockets 2.12.4

Using activemodel 4.0.13 from source at `/home/rubys/git/rails`

Using jbuilder 1.5.3

Using actionpack 4.0.13 from source at `/home/rubys/git/rails`

Using mail 2.6.4

Using sdoc 0.4.1

Using activerecord 4.0.13 from source at `/home/rubys/git/rails`

Using railties 4.0.13 from source at `/home/rubys/git/rails`

Using sprockets-rails 2.3.3 from source at `/home/rubys/git/sprockets-rails`

Using actionmailer 4.0.13 from source at `/home/rubys/git/rails`

Using coffee-rails 4.0.1

Using jquery-rails 3.1.4

Using sass-rails 4.0.5

Using rails 4.0.13 from source at `/home/rubys/git/rails`

Using turbolinks 2.5.3

Bundle complete! 11 Gemfile dependencies, 42 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.rdoc  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/20160613194030_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

      create        test/helpers/products_helper_test.rb

      invoke    jbuilder

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

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

      invoke  assets

      invoke    coffee

      create      app/assets/javascripts/products.js.coffee

      invoke    scss

      create      app/assets/stylesheets/products.css.scss

      invoke  scss

      create    app/assets/stylesheets/scaffolds.css.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 action: 'show', status: :created,

          location: @product }

      else

        format.html { render action: '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 { head :no_content }

      else

        format.html { render action: '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 }

      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

<h1>Listing products</h1>

<table>

  <thead>

    <tr>

      <th>Title</th>

      <th>Description</th>

      <th>Image url</th>

      <th>Price</th>

      <th></th>

      <th></th>

      <th></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/20160613194030_create_products.rb

class CreateProducts < ActiveRecord::Migration

  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

rake db:migrate

mv 20160613194030_create_products.rb 20160613000001_create_products.rb

== 20160613000001 CreateProducts: migrating ===================================

-- create_table(:products)

   -> 0.0008s

== 20160613000001 CreateProducts: migrated (0.0009s) ==========================

Restart the server.

Get an (empty) list of products

get /products

Listing products

Title	Description	Image url	Price

New Product

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 |msg| %>

        <li><%= msg %></li>

      <% end %>

      </ul>

    </div>

  <% end %>

  <div class="field">

    <%= f.label :title %><br>

    <%= f.text_field :title %>

  </div>

  <div class="field">

    <%= f.label :description %><br>

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

  </div>

  <div class="field">

    <%= f.label :image_url %><br>

    <%= f.text_field :image_url %>

  </div>

  <div class="field">

    <%= f.label :price %><br>

    <%= f.text_field :price %>

  </div>

  <div class="actions">

    <%= f.submit %>

  </div>

<% end %>

Create a product

get /products/new

New product

Back

post /products

product[title] => Seven Mobile Apps in Seven Weeks
product[description] => Native Apps, Multiple Platforms 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.
product[price] => 29.00
product[image_url] => 7apps.jpg

You are being redirected.

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

Product was successfully created.

Title: Seven Mobile Apps in Seven Weeks

Description: Native Apps, Multiple Platforms 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.

Image url: 7apps.jpg

Price: 29.0

Edit | Back

Verify that the product has been added

get /products

Listing products

Title	Description	Image url	Price
Seven Mobile Apps in Seven Weeks	<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>	7apps.jpg	29.0	Show	Edit	Destroy

New Product

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

rake test

rake aborted!

ActiveRecord::PendingMigrationError: Migrations are pending; run 'bin/rake db:migrate RAILS_ENV=test' to resolve this issue.

/home/rubys/git/rails/activerecord/lib/active_record/migration.rb:383:in `check_pending!'

/home/rubys/git/awdwr/edition4/work-225-40/depot/test/test_helper.rb:6:in `<class:TestCase>'

/home/rubys/git/awdwr/edition4/work-225-40/depot/test/test_helper.rb:5:in `<top (required)>'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `require'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `block in require'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:214:in `load_dependency'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `require'

/home/rubys/git/awdwr/edition4/work-225-40/depot/test/helpers/products_helper_test.rb:1:in `<top (required)>'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `require'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `block in require'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:214:in `load_dependency'

/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:229:in `require'

/home/rubys/git/rails/railties/lib/rails/test_unit/sub_test_task.rb:73:in `block (3 levels) in define'

/home/rubys/git/rails/railties/lib/rails/test_unit/sub_test_task.rb:73:in `each'

/home/rubys/git/rails/railties/lib/rails/test_unit/sub_test_task.rb:73:in `block (2 levels) in define'

/home/rubys/git/rails/railties/lib/rails/test_unit/sub_test_task.rb:72:in `each'

/home/rubys/git/rails/railties/lib/rails/test_unit/sub_test_task.rb:72:in `block in define'

/home/rubys/git/rails/railties/lib/rails/test_unit/testing.rake:61:in `block in <top (required)>'

/home/rubys/.rvm/gems/ruby-2.2.5/gems/rake-11.2.1/exe/rake:27:in `<top (required)>'

/home/rubys/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `eval'

/home/rubys/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `<main>'

Tasks: TOP => test:run => test:units

(See full trace by running task with --trace)

Run options: --seed 11194

# Running tests:

Finished tests in 0.000826s, 0.0000 tests/s, 0.0000 assertions/s.

0 tests, 0 assertions, 0 failures, 0 errors, 0 skips

6.2 Iteration A2: Making Prettier Listings 2 Instant Gratification

Agile Web Development with Rails, Edition 4

6.1 Iteration A1: Creating the Products Maintenance Application

Restart the server.

Listing products

New product

Listing products