Apartment allows Rack applications to deal with database multitenancy through ActiveRecord

ActiveRecord/Rails integration for multi-tenant databases, in particular the Citus extension for PostgreSQL

Integrates multi-tenancy into a Rails application in a convenient and out-of-your way manner

Transparent multi-tenanting for web applications based on Rails and Devise

A new way to manage multi-tenant applications based on multiples databases

never let an unscoped Model.all accidentally leak data to an unintended audience.

This gem helps you providing whitelabel functionality in your application

Integrates multi-tenancy into Rail application with MySql db

Build a highly secure, multi-tenant rails app without data leak.

Rails multitenancy with PostgreSQL schemas.

Allows a Rails application to run multiple subdomain sites transparently inside of a single Rails instance. This allows for multi-homed or multi-tenant databases very easily.