It offers base classes and helpers for creating MCP applications, making it easier to integrate your Ruby/Rails application with the MCP standard

HyperLogLog for Rails and Postgres

Ruby library to automatically preload data for your Active Model Serializers

Simply cache whatever you want by using cachers which will help you maintain cached objects and expire them when they are changed. Support Rails 3, 4, 5.

Make ActiveRecord null model aware.

Amazon Aurora Serverless is an on-demand, auto-scaling configuration for Amazon Aurora (MySQL-compatible and PostgreSQL-compatible editions). Perfect for small Rails on AWS Lambda.

Allows you to manage preload condition by `:if` condition.

Makes read-only models easier to implement in ActiveRecord 3.x/4.x/5.x.

Make ActiveRecord queries cacheable throughout your apps!

A new way to manage multi-tenant applications based on multiples databases

Supports binary COPY into PostgreSQL with activerecord

Extends ActiveRecord to support covering indexes in PostgreSQL using the INCLUDE clause.

Opt-in validations for your ActiveRecord models based on your MySQL database constraints, including text field size, UTF-8 encoding issues, and NOT NULL constraints.

Batch up your ActiveRecord "touch" operations for better performance. ActiveRecord::Base.delay_touching do ... end. When "end" is reached, all accumulated "touch" calls will be consolidated into as few database round trips as possible.

This gem automatically logs SQL EXPLAIN of every queries. You can check naturally every SQL EXPLAIN from development log, without manually executions.

Allow ActiveRecord to share a connection to multiple databases on the same host

ActiveRecord extension to allow partitioning ids into regions, for merge replication purposes

An ActiveRecord plugin providing a higher-level abstraction for SQL 'LIKE' queries

ActiveRecord OpenTracing intrumenter

This gem adds comments to the SQL to indicate where the SQL parts are constructed.