ActiveRecord Tableless Models provides a simple mixin for creating models that are not bound to the database. This approach is useful for taking advantage of the features of ActiveRecord such as validation, relationships, etc.

acts_as_xlsx lets you turn any ActiveRecord::Base inheriting class into an excel spreadsheet. It can be added to any finder method or scope chain and can use localized column and sheet names with I18n.

A Rails library for storing user sessions in a backend database

Auto-create models, views, controllers, and routes with this slick Rails extension

Chamber lets you source your Settings from an arbitrary number of YAML files and provides a simple mechanism for overriding settings from the ENV, which is friendly to how Heroku addons work.

Mine remote data into your ActiveRecord models. You can also perform associations and convert units.

A malware/botnet analysis framework written in Ruby.

Stores draft versions of your ActiveRecord models' data in a single table or split up into separate tables. Works with Ruby on Rails and Sinatra.

FortyFacets lets you easily build explorative search interfaces based on fields of your active_record models.

Functional Reactive Programming with EventSourcing in Ruby

Functional Reactive Programming with EventSourcing in Ruby

Log transitions on a state machine to support auditing and business process analytics.

A phishing kit collector for scavengers

JRuby gem for performing multidimensional queries of relational database data using Mondrian OLAP Java library

RGeo is a geospatial data library for Ruby. RGeo::ActiveRecord is an optional RGeo module providing some spatial extensions to ActiveRecord, as well as common tools used by RGeo-based spatial adapters.

SchemaValidations extends ActiveRecord to automatically create validations by inspecting the database schema. This makes your models more DRY as you no longer need to duplicate NOT NULL, unique, numeric and varchar constraints on the model level.

Translatable columns for Rails 4.2 or better, stored in the model table itself.

Suffering from ActiveRecord instantiation anxiety? Try Valium. It saves your CPU and memory for more important things, retrieving just the values you're interested in seeing.

Amazon Redshift adapter for ActiveRecord 6.x.

Gem adds an "analyze" method to all Active Record query objects. Compatible with PostgreSQL database.