Released seed-do v4.0.0

I maintain seed-do , which is a fork of seed-fu updated to work with the latest Ruby and Rails. This time, I added performance improvements and released it as v4.0.0 . Main changes By using SeedDo.seed(bulk: true) , you can now UPSERT records in bulk using Rails' upsert_all . Here is the PR: Enable bulk upsert in SeedDo.seed by willnet · Pull Request #26 · willnet/seed-do For most people, simply replacing SeedDo.seed with SeedDo.seed(bulk: true) should make seeding faster. However, because this feature uses the :unique_by option of upsert_all , it only works with PostgreSQL and SQLite. Sorry to MySQL users. Also, while adding this feature, I reorganized the internal API, which caused breaking changes. So I bumped the major version. If you are not using the internal API, this should not affect you. If you try it, I would be happy to hear your feedback.