Database-backed Action Cable backend.

ThumbsUp provides dead-simple voting capabilities to ActiveRecord models with karma calculation, a la stackoverflow.com.

Zero downtime migrations with ActiveRecord and PostgreSQL

Tools to build your double entry financial ledger

MetaWhere offers the ability to call any Arel predicate methods (with a few convenient aliases) on your Model's attributes instead of the ones normally offered by ActiveRecord's hash parameters. It also adds convenient syntax for order clauses, smarter mapping of nested hash conditions, and a debug_sql method to see the real SQL your code is generating without running it against the database. If you like the new AR 3.0 query interface, you'll love it with MetaWhere.

Extend ActiveRecord pluck to return hash instead of an array. Useful when plucking multiple columns.

Rails extensions for using Roar in the popular web framework.

Make your PG migrations safe.

Create temporary table-backed ActiveRecord models for use in tests

Real PostgreSQL 9.5+ upserts using ON CONFLICT for ActiveRecord

ActiveWarehouse ETL is a pure Ruby Extract-Transform-Load application for loading data into a database.

ActiveRecord provides validations on app level but it won't guarantee the consistent. In some cases, like `validates_uniqueness_of` it executes additional SQL query to the database and that is not very efficient. The main goal of the gem is to provide compatibility between database constraints and ActiveRecord validations with better performance and consistency.

Easy SQL based report generation with the ability to accept request parameters and render multiple formats.

A good, simple, solid tagging extension for ActiveRecord

Mongify allows you to map your sql data into a mongodb document database with a simple DSL.

Multiple databases for Rails

A simple framework for building APIs with Grape

Write Through and Read Through caching library inspired by CacheMoney and cache_fu, support ActiveRecord 4.

Idempotent operations for Rails apps, built on top of ActiveJob.

Make your model acts as a list. This acts_as extension provides the capabilities for sorting and reordering a number of objects in a list. The class that has this specified needs to have a +position+ column defined as an integer on the mapped database table.