The document discusses routes and controllers in Rails. It provides an overview of REST, including that it supports stateless communication and a uniform interface. It describes Rails REST helpers that allow defining resources and generating RESTful routes. It then outlines the default REST actions including index, show, new, create, edit, update, and delete along with the corresponding HTTP methods and sample URLs.

1. ROUTES AND CONTROLLERS

2. ROUTES
• Abstract literal URLs from code
• The mapping between URLs and code, serves two purposes:
• Recognize URLs and trigger a controller action
• Generate URLs from names or objects, so you don’t have to
hard code them in views

3. REST
• Representational State Transfer (REST)
• Architecture Pattern
• Supports Distributed Hypermedia
such as the World Wide Web
• Roy Fielding, 2000

4. CLIENT - SERVER

5. STATELESS

6. CACHE

7. UNIFORM INTERFACE

8. REST
• client-server
• stateless communication
• uniform interface between components
• separation of concerns
between UI and data storage

9. RAILS REST HELPERS
in routes.rb
resources :people
$ rake routes
people GET
/people(.:format)
{:action=>"index", :controller=>"people"}
people POST
/people(.:format)
{:action=>"create", :controller=>"people"}
new_person GET
/people/new(.:format)
{:action=>"new", :controller=>"people"}
edit_person GET
/people/:id/edit(.:format)
{:action=>"edit", :controller=>"people"}
person GET
/people/:id(.:format)
{:action=>"show", :controller=>"people"}
person PUT
/people/:id(.:format)
{:action=>"update", :controller=>"people"}
person DELETE
/people/:id(.:format)
{:action=>"destroy", :controller=>"people"}

10. DEFAULT REST
Index
The index action provides a list of all the resources of a specific type
Sample URL: http://localhost:3000/people
HTTP GET
Defualt web page: index.html
Show
The show action displays the details of a specific resources, by default identified by its ID
Sample URL: http://localhost:3000/people/42
HTTP GET
Defualt web page: show.html

11. DEFAULT REST
New
The new action displays the a form for creating a new object
Sample URL: http://localhost:3000/people/new
HTTP GET
Defualt web page: new.html
Create
The create action accepts the form fields as parametrs to create a new model
Sample URL: http://localhost:3000/people
HTTP POST
no corresponding web page (re-directs to show.html to display the newly created object)

12. DEFAULT REST
Edit
The edit action displays the a form for modifying a specific object
Sample URL: http://localhost:3000/people/42/edit
HTTP GET
Defualt web page: edit.html
Update
The update action accepts form fields as parametrs to modify the attributes of a model
Sample URL: http://localhost:3000/people/42
HTTP PUT
no corresponding web page (re-directs to show.html to display the modified object)

13. DEFAULT REST
Delete
The delete action destroys a specific model
Sample URL: http://localhost:3000/people/42
HTTP DELETE