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 --dev

      create  

      create  README.rdoc

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/assets/images/rails.png

      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/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

Using rake (10.0.3) 

Using i18n (0.6.1) 

Using minitest (4.6.1) 

Using multi_json (1.6.1) 

Using atomic (1.0.1) 

Using thread_safe (0.1.0) 

Using tzinfo (0.3.35) 

Using activesupport (4.0.0.beta) 

Using builder (3.1.4) 

Using erubis (2.7.0) 

Using rack (1.5.2) 

Using rack-test (0.6.2) 

Using actionpack (4.0.0.beta) 

Using mime-types (1.21) 

Using polyglot (0.3.3) 

Using treetop (1.4.12) 

Using mail (2.5.3) 

Using actionmailer (4.0.0.beta) 

Using activemodel (4.0.0.beta) 

Using activerecord-deprecated_finders (0.0.3) 

Using arel (3.0.2.20120819075748) 

Using activerecord (4.0.0.beta) 

Using activeresource (4.0.0.beta) 

Using bundler (1.3.0.pre.8) 

Using coffee-script-source (1.4.0) 

Using execjs (1.4.0) 

Using coffee-script (2.2.0) 

Using json (1.7.7) 

Using rdoc (3.12.1) 

Using thor (0.17.0) 

Using railties (4.0.0.beta) 

Using coffee-rails (4.0.0.beta) 

Using hike (1.2.1) 

Using jbuilder (1.0.2) 

Using jquery-rails (2.2.1) 

Using tilt (1.3.3) 

Using sprockets (2.8.2) 

Using sprockets-rails (2.0.0.rc2) 

Using rails (4.0.0.beta) 

Using sass (3.2.6) 

Using sass-rails (4.0.0.beta) 

Using sqlite3 (1.3.7) 

Using turbolinks (1.0.0) 

Using uglifier (1.3.0) 

Your bundle is complete! 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.js.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