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.

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

Add unsigned option to integer type for ActiveRecord's MySQL2 adapter

ActiveRecord OpenTracing intrumenter

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

Gives a hook on MySQL warnings that allow you to either raise or log them.

Active Record support for PostgreSQL JSON type

A whole bunch of extensions the ActiveRecord PostgreSQL adapter.

This gem allows automatic connection switching between a primary and one read replica database in ActiveRecord. It pattern matches the SQL statement being sent to decide whether it should go to the replica (SELECT) or the primary (INSERT, UPDATE, DELETE).

Amazon Redshift adapter for ActiveRecord 7+