ActiveRecord

Basics

ORM in Rails

Object

+

Relational 

Mapping

ORM

ActiveRecord connects classes to relational database tables.

'M' in MVC

Model

The layer of the system responsible for representing business data and logic.

Associations

Associations

• belongs_to
• has_one
• has_many
• has_many :through
• has_one :through
• has_and_belongs_to_many

Validations

Active Record Pattern

"An object that wraps a row in a database table or view,
encapsulates the database access, and adds domain logic on that data."

         - Martin Fowler 

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