The document outlines the steps to create a Rails application called Depot that includes a Product model with title, description, image_url, and price attributes. It describes generating a scaffold for the Product model, running migrations to set up the database table, seeding the database with sample data, and pushing the application to Heroku. Key steps include generating the Rails application, adding the Product model, configuring the database, and deploying the application.

1. Creating the Application

2. Creating a Rails application
• rvm --create use 1.8.7@rails3
• rails new depot
• cd depot
• echo ‘rvm use 1.8.7@rails3’ >> .rvmrc
• bundle install
• rails generate scaffold Product
title:string description:text
image_url:string price:decimal

3. Rails Migration
• db/migrate/2010031041958_create_products.
rb (yours may vary)

4. Run Your DB Migrations
• rake db:migrate
– Creates the products table
– Includes the fields we listed
• rake db:rollback
– Reverts last migration
– Drops the products table

5. Let’s try it
• rails server
• http://localhost:3000/products
– Create a new Product
– Verify product was created
– Reload /products to see list of products
– Try deleting a product

6. Change view files
• We want to change the number of lines
in the description field to 6
• app/views/products/_form.html.erb
– Change
<%= f.text_area :description %>
to
<%= f.text_area :description, :rows => 6 %>

7. Run tests
• rake test
– You should see 0 failures, 0 errors
– We’ll cover this more later

8. Add seed data to our DB
• We don’t want to have to create test
data manually all the time
• Rails offers db/seeds.rb which will
“seed” your database with test data
• curl -o db/seeds.rb
http://media.pragprog.com/titles/rails4/c
ode/depot_b/db/seeds.rb

9. Grab book images and layout
• http://media.pragprog.com/titles/rails4/code/d
epot_b/public/images/
– Download each image and put it in public/images/
• curl -o public/stylesheets/depot.css
http://media.pragprog.com/titles/rails4/code/d
epot_b/public/stylesheets/depot.css
• rm public/stylesheets/scaffold.css

10. Seed our database
• rake db:seed
– Runs content in db/seeds.rb
• Reload /products to see our new “seed”
books

11. Add stylesheet
• System wide layout file
• app/views/layouts/application.html.erb
• <%= stylesheet_link_tag :all %>

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

13. Push Depot to Heroku
• Add Heroku to Gemfile
• “bundle install”
• heroku create
• git push heroku master
• heroku rake db:migrate
• heroku rake db:seed
• heroku open (add /products to URL)