How to fix Ecto duplicate name migrations error

If you run into the following error while running your Ecto migrations

** (Ecto.MigrationError) migrations can't be executed, migration name foo_bar is duplicated
   (ecto) lib/ecto/migrator.ex:259: Ecto.Migrator.ensure_no_duplication/1
   (ecto) lib/ecto/migrator.ex:235: Ecto.Migrator.migrate/4

You can fix it by running 1 migration at a time

mix ecto.migrate --step 1

This happens when you are trying to run two migrations with the same name (regardless of the timestamps). By restricting it to run 1 migration at a time you won’t run into this issue.

Ideally you should not have 2 migrations with the same name :)

I am currently working on Zammu which makes Automatic Deployment of static websites to Github Pages very easy. I would love to get your feedback on it, Use the invitation code KHAJA