ActiveRecord patterns for Rails models and queries.
/plugin install activerecord@claude-ruby-marketplaceTriggers: Writing migrations, defining associations, adding validations, optimizing queries, N+1 prevention
Comprehensive ActiveRecord reference covering:
- CRUD operations, conventions, dirty tracking, type casting
- Migrations, indexes, constraints, safe patterns
- Validations (built-in, custom, contexts) with constraint decision framework
- Callbacks, transaction callbacks, alternatives
- All association types (belongs_to, has_many, :through, polymorphic)
- Query interface, eager loading, scopes, batch processing
References: basics.md, migrations.md, validations.md, callbacks.md, associations.md, querying.md