Active Record Basics

This guide is an introduction to Active Record.

After reading this guide, you will know:

• How Active Record fits into the Model-View-Controller (MVC) paradigm.
• What Object Relational Mapping and Active Record patterns are and how they are used in Rails.
• How to use Active Record models to manipulate data stored in a relational database.
• Active Record schema naming conventions.
• The concepts of database migrations, validations, callbacks, and associations.