Build a Feature Flag System in 50 Lines with Rails.app.creds | Code With Rails

You don’t need LaunchDarkly. You don’t need Flipper. For most Rails apps, you need feature flags that are version-controlled, easy to override in development, and don’t require another service to manage. Rails 8.2’s Rails.app.creds gives you exactly that. Here’s a complete feature flag system in under 50 lines of code. The Core Insight Rails.app.creds checks ENV first, then encrypted credentials. This means: Store your flags in credentials.yml.enc (version controlled, reviewed in PRs) Override with ENV variables anytime (testing, debugging, gradual rollouts) No database. No external service. No API calls.