Build complex SQL queries by defining each subquery separately. Query::Composer will then compose those subqueries together, nesting as needed, to produce the final SQL query.

RecordWithOperator is a rails plugin that makes your all active record models to be saved or logically deleted with created_by, updated_by, deleted_by automatically. Also it makes creator, updater, deleter association (belongs_to) if the class has created_by, updated_by, deleted_by.

Positionless model sorting for Rails.

Real stubs and spies for HTTP(S) services

Adds shorthands and conveniences to ActiveRecord's handling of indexes

Setler is a Gem that lets one easily implement the "Feature Flags" pattern, or add settings to individual models. This is a cleanroom implementation of what the 'rails-settings' gem does. It's been forked all over the place, and my favorite version of it doesn't have any tests and doesn't work with settings associated with models.

Simple, conservative slave reads for ActiveRecord

Stateful workflow modeling for Rails

This gem provides asynchronous indexing to Solr for the sunspot gem. It uses a pluggable model for the backing queue and provides support for ActiveRecord, DataMapper, and MongoDB out of the box.

Tenacity provides a database client independent way of specifying simple relationships between models backed by different databases.

Manage delta indexes via Resque for Thinking Sphinx

ULID for Rails

A library for validating model association existence.

Add some nice ActiveModel/ActiveRecord validators.

Useful helpers to consistently migrate Integer id columns to UUID in PostgreSql. Special support for primary keys and references.

A streamlined, production-focused toolkit for building MCP servers in Rails applications. Provides essential base classes, authentication gateways, and HTTP transport with minimal dependencies.

ActionSubscriber is a DSL that allows a rails app to consume messages from a RabbitMQ broker.

Gem that allows to attach dynamic attributes to ActiveRecord model

activejob-cancel provides cancel method to Active Job

ActiveRecordDistinctOn adds support for `DISTINCT ON` to ActiveRecord. At the time of this writing, PostgreSQL is the only database which supports this syntax; however, this gem has been written with database independence in mind so that if another Arel visitor adds support for `Arel::Nodes::DistinctOn` in the future, it should work seamlessly.