activerecord
Installation
SKILL.md
ActiveRecord
Comprehensive guide to ActiveRecord associations, queries, validations, and database optimization in Rails.
Associations
Association Types
| Type | Description |
|---|---|
belongs_to |
Foreign key on this model's table |
has_one |
Foreign key on other model's table (singular) |
has_many |
Foreign key on other model's table (plural) |
has_many :through |
Many-to-many via join model |
has_one :through |
One-to-one via join model |
has_and_belongs_to_many |
Many-to-many via join table (no model) |