extend pluck. https://github.com/kidach1/pluckex

Get GlobalIDs from an ActiveRecord scope without instantiating AR objects

Rails pluck but returns hash instead of array

A DSL for presenting ActiveRecord::Relations without instantiating ActiveRecord models

Plumber is a library for creating and updating ActiveRecord models from external data

counter_cache, but much more powerful

Provides active record extension to capture historical property data

Oracle "enhanced" ActiveRecord adapter contains useful additional methods for working with new and legacy Oracle databases. This adapter is superset of original ActiveRecord Oracle adapter.

Lightweight state machine for Active Record and Active Model.

Rails validators for polish numbers: PESEL, NIP, REGON, IBAN

Does the same as https://github.com/clio/polymorphic_integer_type but without monkey-patching, using ActiveRecord::Enum instead.

Alternative for ActiveRecord's Single Table Inheritance

Provides really easy tagging for rails and ActiveRecord models

An alternative to DatabaseCleaner for automatically ensuring that objects created during tests are removed from the database.

Poor man's search engine module for Rails3 (Arel)

Simple Polymorphic enumerations for Ruby on Rails. Inspired by Enumerate_it, not inspired by ActiveRecord's enum

Populates your development database with fake data

Population for rails apps.

Rails caching with an RDBMS backend. Also a key/value store with a Redis compatible interface backed by an RDBMS.

Handles after_add and after_remove outside of the AR callback flow to keep things that aren't directly tied to the model outside of it