Make ActiveRecord's PostgreSQL adapter always use bigint columns

Compatible with mysql, sqlite, and postgres

A Rails plugin to move legacy data into a separate table

Enable PostgreSQL's CHECK constraints on ActiveRecord migrations

A tool to simplify creation and development of Ruby daemons.

Adds support for missing SQL operators and functions to Arel

Provides haversine formula, implemented with Arel; which could be added to ActiveRecord scope, for instance.

Provides trigonometry functions, implemented with Arel; which could be added to ActiveRecord scope, for instance.

Add support for creating `ENUM` types in PostgreSQL with ActiveRecord

ARiiP: integrate everything. Automated real-time integration & interoperability platform.

Tools for Interval columns for ActiveRecord

Monocle helps you manage your DB views.

Pagination for Rails controllers.

Use a Postgres array column to manage a model's roles

Make ActiveRecord's PostgreSQL adapter use timestamptz as datetime columns

Store values for multiple languages in an ActiveRecord attribute using PostgreSQL's hstore.

Model-side logic for autocompleting belongs_to associations

ASIR ActiveRecord Transport

Automatic Foreign Key automatically generates foreign-key constraints when creating tables or adding columns. It uses SQL-92 syntax and as such should be compatible with most databases that support foreign-key constraints.

Adds support in ActiveRecord for foreign_keys, complex indexes and other database-related stuff. Easily create foreign_keys, complex indexes and views.