Monday, April 21, 2008

Rails Chops: Editing data

Concepts:
  • ActiveRecord - update attributes
  • RESTful routing - edit/update
  • partials
Please view in full screen.

Monday, April 14, 2008

Rails Chops: Creating new stories and validations

Concepts:
  • New/Create RESTful routes
  • Form Helpers
  • Validations
FYI, video looks much better in full-screen.

Friday, April 11, 2008

Rails Chops: Starting a Rails App

Concepts:
  • ActiveRecord Basics
  • Migration Basics
  • Creating a controller and a view

Wednesday, April 9, 2008

Rails Chops: RESTful Routes

Reference: Chapter 4 (The Rails Way)

In Rails, by adding map.resources :stories to config/routes.rb, you get 7 predefined routes:

  • stories GET /stories {:controller=>”stories”, :action=>”index”}

  • POST /stories {:controller=>”stories”, :action=>”create”}

  • new_story GET /stories/new {:controller=>”stories”, :action=>”new”}

  • edit_story GET /stories/:id/edit {:controller=>”stories”, :action=>”edit”}

  • story GET /stories/:id {:controller=>”stories”, :action=>”show”}

  • PUT /stories/:id {:controller=>”stories”, :action=>”update”}

  • DELETE /stories/:id {:controller=>”stories”, :action=>”destroy”}


Slowly but surely we are going to build an app from the ground up and use all of these RESTful routes. Its very important to understand what each of these do and how to incorporate them into your application. These routes control how we setup our controller, actions, links, and forms. It is amazing how much is conventionalized around one configuration line map.resources :stories

  • POST is a CREATE

  • GET is a READ

  • PUT is an UPDATE

  • DELETE is a DELETE

Sunday, April 6, 2008

Rails Chops: Working with databases

References

Objectives

  • Configure Rails to work with a database (database.yml)

  • create table (migration)

  • use ActiveRecord to interact with our database

  • use script/console to learn how ActiveRecord works

Model

  • handle application state (usually in the database)

  • encapsulate business logic, such as data validation and rules applied to data

ActiveRecord

  • ORM (object-relational mapping)

  • Instead of dealing with database through SQL statements, ORM layer presents records as a collection of objects

  • Table represents a collection of objects(stories)

  • Record represents an object/model (story)

  • Field represents an object attribute (title)

CRUD operations on database

  • C: create, insert record into table

  • R: read, select record(s) from table

  • U: update, update record(s) in the table

  • D: delete, delete record(s) from the table