Upgrade Rails: Awareness list

Disclaimer

This card is a collection of guides and things to have in mind when upgrading to a specific version. It is not meant to be complete, so please feel free to contribute!

General workflows

• The official guide Show archive.org snapshot
• How to upgrade Rails: Workflow advice
• Upgrading Rails: Example commits

Upgrade to Rails 7

• Don't use log level :debug in your production environments
• Rails 7.1: Take care of the new production log default to standard out

Upgrade to Rails 6

• Don't use log level :debug in your production environments

Upgrade to Rails 5

• Error during Rails 5 upgrade: Environment data not found in the schema

Older versions

• Migrating an application to Rails 3 from Rails 2
• Upgrade from Rails 2.3 to 3.2 – an incomplete guide
• Upgrading Rails 2 from 2.3.8 through 2.3.18 to Rails LTS