How to fix Ecto duplicate name migrations error

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

ReleaseTasks.migrate
** (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 :)


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