Reverts applied migrations in the given repository.

Tenant migrations are expected at “priv/YOUR_REPO/tenant_migrations” directory of the current application, where “YOUR_REPO” is the last segment in your repository name. For example, the repository MyApp.Repo will use “priv/repo/tenant_migrations”. The repository Whatever.MyRepo will use “priv/my_repo/tenant_migrations”.

You can configure a repository to use another directory by specifying the :priv key under the repository configuration. The “migrations” part will be automatically appended to it. For instance, to use “priv/custom_repo/migrations”:

config :my_app, MyApp.Repo, priv: "priv/custom_repo"

To change the “tenant_migrations” part, you can set the :migrations_path config under triplex configuration. For example, to use “priv/repo/my_migrations”:

config :triplex, migrations_path: "my_migrations"

This task runs all pending migrations by default. Runs the last applied migration by default. To roll back to a version number, supply --to version_number. To roll back a specific number of times, use --step n. To undo all applied migrations, provide --all.

The repositories to rollback are the ones specified under the :ecto_repos option in the current app configuration. However, if the -r option is given, it replaces the :ecto_repos config.

If a repository has not yet been started, one will be started outside your application supervision tree and shutdown afterwards.

Examples

mix ecto.rollback
mix ecto.rollback -r Custom.Repo

mix ecto.rollback -n 3
mix ecto.rollback --step 3

mix ecto.rollback --to 20080906120000

Command line options

• -r, --repo - the repo to rollback
• --all - revert all applied migrations
• --step / -n - revert n number of applied migrations
• --to - revert all migrations down to and including version
• --quiet - do not log migration commands
• --pool-size - the pool size if the repository is started only for the task (defaults to 1)
• --log-sql - log the raw sql migrations are running
• --no-compile - does not compile applications before rolling back
• --no-deps-check - does not check depedendencies before rolling back

PS

All of this code is copied from mix ecto.rollback task, if something does not work, please compare them and try to stay as close to it as possible.