Ruby on Rails: Get More From ActiveRecord

Explore how models and associations in Ruby on Rails provide an object-oriented interface to relational databases, automate common tasks, and speed up web application development.

Introduction

• Efficient, object-oriented data management
• What you should know
• Using the exercise files on GitHub

1. Smarter Models

• Smart models by design
• More ActiveRecord query methods
• Select data from a query
• Named scopes
• Non-database attributes

2. Data Validations

• Overview of validation methods
• Write validations
• Use the multipurpose validates method
• Write custom validations

3. ActiveRecord Callbacks

• Overview of callbacks
• Use callbacks to automate actions
• Execute callbacks conditionally

4. ActiveRecord Associations

• Overview of associations
• Create a one-to-many association
• Use a one-to-many association
• Destroy dependent related records
• Has and belongs to many associations
• Rich join associations
• Traverse a rich join association
• Join tables during queries

Conclusion

• Next steps