Elegant SQLite Multitenancy in Rails

This article details the experience of building a multi-tenant application with Rails, where each tenant has its own isolated SQLite database. The author initially used traditional database connection management, leading to connection errors under high load. After much exploration, the author finally used the Rails 6+ `connected_to` method combined with a custom middleware to achieve safe and efficient tenant database switching, cleverly solving the problems of multithreading and connection pool management, and sharing tips for handling Rack streaming response bodies. This article is valuable for building high-performance, scalable multi-tenant applications.