Rails 6 adds db:seed:replant task

Takeaways

• rails db:seed:replant (Rails 6+): truncates all tables for the current environment, then loads db/seeds.rb.
• Replaces awkward workflow: db:setup rebuilds test + development and re-seeds — overkill when you only want fresh dev/staging seed data.
• Safety: runs db:check_protected_environments — aborts in production unless DISABLE_DATABASE_ENVIRONMENT_CHECK=1.
• Sequence: db:load_config → db:truncate_all → db:seed (with migration checks).

Notes

Saeloun blog walkthrough of Rails PR #34779. Handy for local dev when seed data or corrupted dev DB needs a clean slate without full schema rebuild.

Open questions

• db:seed:replant vs. db:reset / db:drop db:create db:migrate db:seed — when to prefer each?