Supabase offers a robust platform for integrating a full Postgres database with Ruby on Rails applications, leveraging the built-in Postgres adapter that Rails provides. This guide walks through the process of creating a new Rails project, connecting it to a Supabase Postgres database, and interacting with it via the Rails Console. It highlights the benefits of Supabase as a cost-effective alternative to Heroku Postgres, complete with a migration tool for easy transition. The setup involves creating a Rails project with a Postgres database using Supabase, configuring the connection details, and utilizing Rails' Active Record for database migration and interaction. Additionally, it covers deploying the application using Fly.io, including provisioning and setting the database connection string as a secret environment variable. The post concludes by emphasizing Supabase's stability and the range of extensions it offers, encouraging users to explore its capabilities for their Rails applications.