Watch for a method call in any class and run before/after callbacks. You can even watch your Rails models for events (like create, update, destroy), send these events to a event-runner instance and it redirect these events to other apps that are subscrived for them. This gem also ...

You can use native PostgreSQL query with named bindings

Get more from ActiveRecord::Store

Provides subset validation for serialized arrays or sets in Active Record

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Dynamically-populated ActiveRecord models based on static data

ActiveRecord extensions for multi tenant applications

ActiveRecord to Thrift tooling

ActiveTokyoCabinet is a library for using Tokyo(Cabinet|Tyrant) under ActiveRecord.

Easily translate specific attributes of any ActiveRecord model

ActiveRecord models and database migrations for Unimod.

ActiveUrl enables the storing of a model in an encrypted URL. It facilitates implementation of secret URLs for user (e.g. feed URLs) that can be accessed without logging in, and URLs for confirming the email address of a new user.

Generate obfuscated UXid's.

Allow to store ActiveModel validations in ORM.

Create Rails active record style validation in your non-Rails app

ActiveWarehouse extends Rails to provide functionality specific for building data warehouses.

Simple, efficient, and extensible webhooks for Ruby, including: Rate Limits, Cryptographic Signatures, Asynchronous Delivery, Buffered Delivery, Versioning.

Redis and database based activity stream in Rails 3 applications

Create an incremental activities feed applying a feedable role to Models

Easy activity tracking for your ActiveRecord models. Provides Activity model with details about actions performed by your users, like adding comments, responding etc.