A practical guide to upgrading from Rails 5.2 to Rails 6 with Zeitwerk autoloader, Webpacker, multiple databases, and Ruby 2.5+ requirements.

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Rails 6 introduces major changes including the Zeitwerk autoloader with strict file naming conventions, Webpacker as the default JavaScript compiler, and requires Ruby 2.5+. Key features include multiple database support, parallel testing, Action Mailbox for incoming emails, and Action Text for rich content. The upgrade process involves updating the Gemfile, migrating to Zeitwerk by fixing file naming issues, setting up Webpacker, handling breaking changes like the removal of update_attributes, and addressing Ruby 2.7 keyword argument warnings. Medium-sized applications typically require 2-4 weeks for the upgrade with 80%+ test coverage recommended.

Upgrading from Rails 5.2 to Rails 6 - Modern Rails Features

Step 5: Multiple Database Support (Optional)