An entry-level introduction to Rails (circa 1.13) I gave at Rochester on Rails. Covers the history, reasons you may use it in a project, and basic architecture.

1. Jason Morrison January 19, 2006 Rochester on Rails Ruby on Rails Sustainable Productivity for Web Application Development

2. History

3. July 2004 David Heineimeier Hansson

4. Extracted from Basecamp

6. 37signals

8. Hundreds of contributors Thousands of revisions, tickets, and patches

9. Rails 1.0 December 13, 2005

11. What is Rails?

12. Full Stack

13. Web Application Framework

14. It’s all Ruby!

15. (okay, except one file)

16. (here it is) database.yml development: adapter: sqlite dbfile: db/dev.db test: adapter: sqlite dbfile: db/test.db production: adapter: sqlite dbfile: db/prod.db

17. Everything else is Ruby!

18. ActiveRecord

19. ActionPack

20. ERb views

21. ActionWebService

22. ActionMailer

23. Unit Testing

24. AJAX Helpers

25. Key Concepts

26. DRY: Don’t Repeat Yourself

27. +

28. Convention over configuration

29. =

30. Less code!

31. Order.hbm.xml 01 <hibernate-mapping> 02 <class name=&quot;models.Order&quot; table=&quot;ORDERS&quot; 03 dynamic-update=&quot;true&quot; dynamic-insert=&quot;false&quot;> 06 <id name=&quot;id&quot; column=&quot;id&quot; type=&quot;java.lang.Long&quot; 07 unsaved-value=&quot;null&quot;> 08 <generator class=&quot;identity&quot;/> 09 </id> 10 <set name=&quot;items&quot; lazy=&quot;false&quot; inverse=&quot;false&quot; 11 cascade=&quot;none&quot; sort=&quot;unsorted&quot;> 12 <key column=&quot;id&quot;/> 13 <one-to-many class=&quot;models.Item&quot;/> 14 </set> 15 <property name=&quot;name&quot; type=&quot;java.lang.String&quot; 16 update=&quot;true&quot; insert=&quot;true&quot; 17 access=&quot;property&quot; column=&quot;name&quot;/> 18 </class> 19 </hibernate-mapping>

32. Order.java 01 public class Order { 02 private Set items; 03 private String name; 04 private Long id; 05 06 public Long getId() { return id;} 07 public void setId(Long id) { this.id = id;} 08 public Set getItems() { return items;} 09 public void setItems(Set items) { this.items = items; } 10 public String getName() { return name; } 11 public void setName(String name) { this.name = name; } 12 }

33. order.rb 01 class Order < ActiveRecord::Base 02 has_many :items 03 end

34. Rails is expressive

35. class Project < ActiveRecord::Base belongs_to :portfolio has_one :project_manager has_many :milestones has_and_belongs_to_many :categories validates_presence_of :name, :description validates_acceptance_of :non_disclosure_agreement validates_uniqueness_of :key end

36. #We’re slashing prices, all books are now half off! Product.find( :all, :conditions => “kind=‘book’” ) do |product| product.price *= 0.5 product.save end

37. Increases Programmer Rails increases programmer…

38. Increases Programmer Rails increases programmerhappiness!

39. How does it fit together?

40. Model View Controller

41. Model View Controller ActiveRecord ActionPack } }

43. Ready, set, code!