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

ruby -rubygems /home/rubys/git/rails/bin/rails new demo1

      create  

      create  README

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/controllers/application_controller.rb

      create  app/helpers/application_helper.rb

      create  app/mailers

      create  app/models

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

      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/inflections.rb

      create  config/initializers/mime_types.rb

      create  config/initializers/secret_token.rb

      create  config/initializers/session_store.rb

      create  config/locales

      create  config/locales/en.yml

      create  config/boot.rb

      create  config/database.yml

      create  db

      create  db/seeds.rb

      create  doc

      create  doc/README_FOR_APP

      create  lib

      create  lib/tasks

      create  lib/tasks/.gitkeep

      create  log

      create  log/server.log

      create  log/production.log

      create  log/development.log

      create  log/test.log

      create  public

      create  public/404.html

      create  public/422.html

      create  public/500.html

      create  public/favicon.ico

      create  public/index.html

      create  public/robots.txt

      create  public/images

      create  public/images/rails.png

      create  public/stylesheets

      create  public/stylesheets/.gitkeep

      create  public/javascripts

      create  public/javascripts/prototype.js

      create  public/javascripts/rails.js

      create  public/javascripts/application.js

      create  script

      create  script/rails

      create  test

      create  test/fixtures

      create  test/functional

      create  test/integration

      create  test/performance/browsing_test.rb

      create  test/test_helper.rb

      create  test/unit

      create  tmp

      create  tmp/sessions

      create  tmp/sockets

      create  tmp/cache

      create  tmp/pids

      create  vendor/plugins

      create  vendor/plugins/.gitkeep

bundle install

Using rake (0.8.7) 

Using abstract (1.0.0) 

Using activesupport (3.1.0.beta) from source at /home/rubys/git/rails 

Using builder (3.0.0) 

Using i18n (0.5.0) 

Using activemodel (3.1.0.beta) from source at /home/rubys/git/rails 

Using erubis (2.6.6) 

Using rack (1.2.1) from source at /home/rubys/git/rack 

Using rack-cache (0.5.3) 

Using rack-mount (0.6.13) 

Using rack-test (0.5.6) 

Using tzinfo (0.3.23) 

Using actionpack (3.1.0.beta) from source at /home/rubys/git/rails 

Using mime-types (1.16) 

Using polyglot (0.3.1) 

Using treetop (1.4.9) 

Using mail (2.2.12) 

Using actionmailer (3.1.0.beta) from source at /home/rubys/git/rails 

Using arel (2.0.7.beta.20101201093009) from source at /home/rubys/git/arel 

Using activerecord (3.1.0.beta) from source at /home/rubys/git/rails 

Using activeresource (3.1.0.beta) from source at /home/rubys/git/rails 

Using bundler (1.0.7) 

Using thor (0.14.6) 

Using railties (3.1.0.beta) from source at /home/rubys/git/rails 

Using rails (3.1.0.beta) from source at /home/rubys/git/rails 

Using sqlite3-ruby (1.3.2) 

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.ru  doc/     Gemfile.lock  log/     Rakefile  script/  tmp/

config/  db/	    Gemfile  lib/	   public/  README    test/    vendor/

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/functional/say_controller_test.rb

      invoke  helper

      create    app/helpers/say_helper.rb

      invoke    test_unit

      create      test/unit/helpers/say_helper_test.rb

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

pub work/demo1

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

pub work/demo2

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

pub work/demo3

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

pub work/demo4

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

pub work/demo5

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