# `mix phoenix_mountable.backfill`
[🔗](https://github.com/hattoriai/phoenix_mountable/blob/v0.2.1/lib/mix/tasks/phoenix_mountable.backfill.ex#L2)

Runs a library's deferred backfills to completion.

    $ mix phoenix_mountable.backfill MyLib.Migrations

Progress is recorded after every batch, so it can be stopped and run again.
In production, `PhoenixMountable.Backfill.Runner` does the same in the
running app.

## Options

  * `-r`, `--repo` — the repo (defaults to the app's `:ecto_repos`)
  * `--prefix` — the prefix
  * `--throttle` — milliseconds to wait between batches

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*Consult [api-reference.md](api-reference.md) for complete listing*