active-record-associations

What problem does it solve?

This Skill provides expert guidance for defining, using, and troubleshooting associations between Active Record models in Ruby on Rails applications, ensuring data integrity and efficient querying.

Core Features & Use Cases

• Define Relationships: Set up one-to-one, one-to-many, many-to-many, and polymorphic associations.
• Optimize Queries: Prevent N+1 query problems using eager loading techniques (includes, preload, eager_load).
• Ensure Data Integrity: Implement dependent: options, database foreign keys, and unique constraints.
• Use Case: When building an e-commerce platform, you need to define how Products belong to Categoryies and how Orders contain multiple OrderItems, ensuring that deleting a Category doesn't leave orphaned Products.

Quick Start

Use the active-record-associations skill to define a has_many :books association on the Author model and a belongs_to :author association on the Book model, including a dependent: :destroy option and a database foreign key.