This document provides an overview of data and views in Rails. It introduces the Team, Location, and Game models and their attributes. It discusses database migrations, RESTful routes, the public folder for static files, and use of ERB templates for views with layouts and partials. It also covers ActiveRecord associations like belongs_to and has_many. The homework is to generate a Player scaffold and display players for a team on its page.

1. UPenn on Rails
Lesson 1: Data and Views

2. Data
Views

3. Data

4. class Team
• name
• (id, created_at, updated_at)

5. class Location
• name
• address
• (id, created_at, updated_at)

6. class Game
• starts_at
• ends_at
• location
• home_team
• away_team
• (id, created_at, updated_at)

7. class Game
• starts_at
• ends_at class Location
• location
• home_team
• away_team
• (id, created_at, updated_at)

8. class Game
• starts_at
• ends_at class Location
• location
• home_team class Team
• away_team
• (id, created_at, updated_at)

9. CODE!

10. Database Migrations
• live in db/migrate
• ordered
• Abstracted SQL column types
• includes id and timestamps by default

11. MORE CODE!

12. RESTful Routes
• GET /locations (show all locations)
• GET /locations/3 (show one location)
• POST /locations (make a location)
• PUT /locations/3 (update one location)

13. Can also be nested
• GET /locations/3/games (show games for
one location)

14. ‘public’ folder
• For all static files
• Rails looks here first
• Offers caching options

15. Views

16. ERB
• Like JSP/ASP, but in ruby
• lots of helper functions for forms, etc.
• layout → view → partials

17. VIEW CODE!

18. ActiveRecord
Associations
• 1 to 1 (belongs_to - has_one)
• 1 to many (belongs_to - has_many)
• many to many (has_many :through)

19. Other points
• Controllers
• Next class: User stories and testing!

20. Homework
• Make a Player scaffold
• Show the players for a given team on that
team’s page
• (bonus) assign players on the team edit
page
• Help at http://railsforzombies.org/