Elixir — Inserting Multiple Changesets Into Database - create batch

class_controller.ex

def create_batch(conn, %{"people" => people_params}) do
  changesets = Enum.map(people_params, fn class ->
    Person.changeset(%Person{}, person)
  end)

  result = changesets
           |> Enum.with_index()
           |> Enum.reduce(Ecto.Multi.new(), fn ({changeset, index}, multi) ->
              Ecto.Multi.insert(multi, Integer.to_string(index), changeset)
           end)
           |> Repo.transaction

  case result do
    {:ok, multi_people_result }  ->
      render(conn, "index.json", people: Map.values(multi_people_result))
    {:error, _, changeset, _ } ->
      render(conn, MyApp.ChangesetView, "error.json", changeset: changeset)
  end
end