6.1 Iteration A1: Creating the Products Maintenance Application Table of Contents

We start with a simple "hello world!" demo application and in the process verify that everything is installed correctly.

Create the application

bundle exec /home/rubys/git/rails/railties/bin/rails new demo1 --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/secrets.yml

      create  config/environments

      create  config/environments/development.rb

      create  config/environments/production.rb

      create  config/environments/test.rb

      create  config/initializers

      create  config/initializers/assets.rb

      create  config/initializers/backtrace_silencers.rb

      create  config/initializers/cookies_serializer.rb

      create  config/initializers/filter_parameter_logging.rb

      create  config/initializers/inflections.rb

      create  config/initializers/mime_types.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 10.5.0

Using i18n 0.7.0

Using json 1.8.3

Using minitest 5.8.3

Using thread_safe 0.3.5

Using builder 3.2.2

Using erubis 2.7.0

Using rack 1.5.5

Using mime-types 2.99

Using arel 5.0.1.20140414130214

Using bundler 1.11.2

Using coffee-script-source 1.10.0

Using execjs 2.6.0

Using thor 0.19.1

Using hike 1.2.3

Using multi_json 1.11.2

Using tilt 1.4.1

Using sass 3.2.19

Using spring 1.6.2

Using sqlite3 1.3.11

Using rdoc 4.2.1

Using tzinfo 1.2.2

Using rack-test 0.6.3

Using mail 2.6.3

Using coffee-script 2.4.1

Using uglifier 2.7.2

Using sprockets 2.12.4

Using sdoc 0.4.1

Using activesupport 4.1.14 from source at `/home/rubys/git/rails`

Using actionview 4.1.14 from source at `/home/rubys/git/rails`

Using activemodel 4.1.14 from source at `/home/rubys/git/rails`

Using jbuilder 2.4.0

Using actionpack 4.1.14 from source at `/home/rubys/git/rails`

Using activerecord 4.1.14 from source at `/home/rubys/git/rails`

Using actionmailer 4.1.14 from source at `/home/rubys/git/rails`

Using railties 4.1.14 from source at `/home/rubys/git/rails`

Using sprockets-rails 2.3.3

Using coffee-rails 4.1.1 from source at `/home/rubys/git/coffee-rails`

Using jquery-rails 3.1.4

Using rails 4.1.14 from source at `/home/rubys/git/rails`

Using sass-rails 4.0.5

Using turbolinks 2.5.3

Bundle complete! 10 Gemfile dependencies, 42 gems now installed.

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

See what files were created

ls -p

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

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

Create a simple controller

rails generate controller Say hello goodbye

      create  app/controllers/say_controller.rb

       route  get 'say/goodbye'

       route  get 'say/hello'

      invoke  erb

      create    app/views/say

      create    app/views/say/hello.html.erb

      create    app/views/say/goodbye.html.erb

      invoke  test_unit

      create    test/controllers/say_controller_test.rb

      invoke  helper

      create    app/helpers/say_helper.rb

      invoke    test_unit

      create      test/helpers/say_helper_test.rb

      invoke  assets

      invoke    coffee

      create      app/assets/javascripts/say.coffee

      invoke    scss

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

edit app/controllers/say_controller.rb

class SayController < ApplicationController

  def hello

  end

  def goodbye

  end

end

Start the server.

Attempt to fetch the file - note that it is missing

get /say/hello

Replace file with a simple hello world

edit app/views/say/hello.html.erb

<h1>Hello from Rails!</h1>

This time it works!

get /say/hello

Add a simple expression

edit app/views/say/hello.html.erb

<h1>Hello from Rails!</h1>

<p>

  It is now <%= Time.now %>

</p>

get /say/hello

Evaluate the expression in the controller.

edit app/controllers/say_controller.rb

class SayController < ApplicationController

  def hello

    @time = Time.now

  end

  def goodbye

  end

end

Reference the result in the view.

edit app/views/say/hello.html.erb

<h1>Hello from Rails!</h1>

<p>

  It is now <%= @time %>

</p>

get /say/hello

Replace the goodbye template

edit app/views/say/goodbye.html.erb

<h1>Goodbye!</h1>

<p>

  It was nice having you here.

</p>

get /say/goodbye

Add a link from the hello page to the goodbye page

edit app/views/say/hello.html.erb

<h1>Hello from Rails!</h1>

<p>

  It is now <%= @time %>

</p>

<p>

  Time to say

  <%= link_to "Goodbye", say_goodbye_path %>!

</p>

get /say/hello

Add a link back to the hello page

edit app/views/say/goodbye.html.erb

<h1>Goodbye!</h1>

<p>

  It was nice having you here.

</p>

<p>

  Say <%= link_to "Hello", say_hello_path %> again.

</p>

get /say/goodbye

6.1 Iteration A1: Creating the Products Maintenance Application Table of Contents