View Source Oban.Migration behaviour (Oban v2.18.2)

Migrations create and modify the database tables Oban needs to function.

Usage

To use migrations in your application you'll need to generate an Ecto.Migration that wraps calls to Oban.Migration:

mix ecto.gen.migration add_oban

Open the generated migration in your editor and call the up and down functions on Oban.Migration:

defmodule MyApp.Repo.Migrations.AddOban do
  use Ecto.Migration

  def up, do: Oban.Migrations.up()

  def down, do: Oban.Migrations.down()
end

This will run all of Oban's versioned migrations for your database.

Now, run the migration to create the table:

mix ecto.migrate

Migrations between versions are idempotent. As new versions are released, you may need to run additional migrations. To do this, generate a new migration:

mix ecto.gen.migration upgrade_oban_to_v11

Open the generated migration in your editor and call the up and down functions on Oban.Migration, passing a version number:

defmodule MyApp.Repo.Migrations.UpgradeObanToV11 do
  use Ecto.Migration

  def up, do: Oban.Migrations.up(version: 11)

  def down, do: Oban.Migrations.down(version: 11)
end

Isolation with Prefixes

Oban supports namespacing through PostgreSQL schemas, also called "prefixes" in Ecto. With prefixes your jobs table can reside outside of your primary schema (usually public) and you can have multiple separate job tables.

To use a prefix you first have to specify it within your migration:

defmodule MyApp.Repo.Migrations.AddPrefixedObanJobsTable do
  use Ecto.Migration

  def up, do: Oban.Migrations.up(prefix: "private")

  def down, do: Oban.Migrations.down(prefix: "private")
end

The migration will create the "private" schema and all tables, functions and triggers within that schema. With the database migrated you'll then specify the prefix in your configuration:

config :my_app, Oban,
  prefix: "private",
  ...

In some cases, for example if your "private" schema already exists and your database user in production doesn't have permissions to create a new schema, trying to create the schema from the migration will result in an error. In such situations, it may be useful to inhibit the creation of the "private" schema:

defmodule MyApp.Repo.Migrations.AddPrefixedObanJobsTable do
  use Ecto.Migration

  def up, do: Oban.Migrations.up(prefix: "private", create_schema: false)

  def down, do: Oban.Migrations.down(prefix: "private")
end

Migrating Without Ecto

If your application uses something other than Ecto for migrations, be it an external system or another ORM, it may be helpful to create plain SQL migrations for Oban database schema changes.

The simplest mechanism for obtaining the SQL changes is to create the migration locally and run mix ecto.migrate --log-migrations-sql. That will log all of the generated SQL, which you can then paste into your migration system of choice.

Alternatively, if you'd like a more automated approach, try using the oban_migations_sql project to generate up and down SQL migrations for you.

Summary

Callbacks

Migrates storage down to the previous version.

Identifies the last migrated version.

Migrates storage up to the latest version.

Functions

Run the down changes for all migrations between the current version and the initial version.

Check the latest version the database is migrated to.

Run the up changes for all migrations between the initial version and the current version.

Callbacks

@callback down(Keyword.t()) :: :ok

Migrates storage down to the previous version.

@callback migrated_version(Keyword.t()) :: non_neg_integer()

Identifies the last migrated version.

@callback up(Keyword.t()) :: :ok

Migrates storage up to the latest version.

Functions

Run the down changes for all migrations between the current version and the initial version.

Example

Run all migrations from current version down to the first:

Oban.Migration.down()

Run migrations down to and including a specified version:

Oban.Migration.down(version: 5)

Run migrations in an alternate prefix:

Oban.Migration.down(prefix: "payments")
Link to this function

migrated_version(opts \\ [])

View Source

Check the latest version the database is migrated to.

Example

Oban.Migration.migrated_version()

Run the up changes for all migrations between the initial version and the current version.

Example

Run all migrations up to the current version:

Oban.Migration.up()

Run migrations up to a specified version:

Oban.Migration.up(version: 2)

Run migrations in an alternate prefix:

Oban.Migration.up(prefix: "payments")

Run migrations in an alternate prefix but don't try to create the schema:

Oban.Migration.up(prefix: "payments", create_schema: false)

Disable UNLOGGED tables for databases that don't support it (e.g. Yugabyte)

Oban.Migration.up(unlogged: false)