Store nested hashes and other types in ActiveRecord hstores

pg-eyeballs is a ruby gem that gives you detailed information about how the SQL queries created by the active record code you write are executed by the database. It gives you an easy, ruby friendly way to see the output of the Postgres EXPLAIN command and integrates with the popular query analysi...

postgresql hstore parser/deparser - provides PgHstore.dump and PgHstore.load (aka parse)

Organize ActiveRecord model into a tree structure using PostgreSQL LTree

A Rails engine that adds a piece of middleware to the top of your middleware stack that looks for redirect rules stored in your database and redirects you accordingly.

Track what product being viewed, what being purchased. Who are consistant buyers etc.

It makes working with pure SQL easier with syntax highlighting. Let's you clean your Ruby code from SQL strings.

Functions from timescaledb available in the ActiveRecord models.

Add support to complex resources of PostgreSQL, like data types, array associations, auxiliary statements (CTE), and full-text search (FTS)

Manage delta indexes via Delayed Job for Thinking Sphinx

Simple gem that allows you to run multiple ActiveRecord::Relation using hash. Perfect for APIs.

Amazon Redshift adapter for ActiveRecord 7.x.

Yet Another N+1 COUNT Query Killer for ActiveRecord

Add relational OLAP-like functionality for ActiveRecord

Redshift-oriented Data Warehouse Batch Framework

A gem to help with hooking Contentful into your Rails application

https://github.com/tsukasaoishi/fresh_connection

The new de-facto for API testing your Rails application

Open-source gems maintenance & maturity tracking

Petri Net Workflow Engine for Ruby.