References

• Read from: “The Rails Way” – Chapter 6
• Active Record Presentation
• Migrations Presentation (ignore mysql at beginning)

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

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