cast_attachments not passing scope to storage_dir when trying to override about arc_ecto HOT 13 CLOSED

pry(2)> Arc.Ecto.Schema.convert_params_to_binary(params)
%{"body" => "adsf", "draft" => "false", "excerpt" => "asdf",
  "photo" => %Plug.Upload{content_type: "image/jpeg", filename: "test.jpg",
   path: "/var/folders/tj/nrvjcskx27ngvqy58x545_2h0000gn/T//plug-1467/multipart-941212-44262-1"},
  "published_at" => %{"day" => "20", "hour" => "0", "minute" => "0",
    "month" => "1", "year" => "2011"}, "slug" => "20", "title" => "20"}
pry(3)> Arc.Ecto.Schema.convert_params_to_binary(params) |> Dict.take([:photo])
%{}     
pry(4)> Arc.Ecto.Schema.convert_params_to_binary(params) |> Dict.take(["photo"])
%{"photo" => %Plug.Upload{content_type: "image/jpeg", filename: "test.jpg",
   path: "/var/folders/tj/nrvjcskx27ngvqy58x545_2h0000gn/T//plug-1467/multipart-941212-44262-1"}}

[error] Task #PID<0.415.0> started from #PID<0.410.0> terminating
** (UndefinedFunctionError) function nil.id/0 is undefined (module nil is not available)
    nil.id()
    (digitalcakes) Digitalcakes.Imagable.storage_dir/2
    lib/arc/storage/s3.ex:5: Arc.Storage.S3.put/3
    (elixir) lib/task/supervised.ex:94: Task.Supervised.do_apply/2
    (elixir) lib/task/supervised.ex:45: Task.Supervised.reply/5
    (stdlib) proc_lib.erl:240: :proc_lib.init_p_do_apply/3
Function: #Function<0.62704849/0 in Arc.Actions.Store.async_put_version/3>
    Args: []
[error] Ranch protocol #PID<0.410.0> (:cowboy_protocol) of listener Digitalcakes.Endpoint.HTTP terminated
** (exit) an exception was raised:
    ** (UndefinedFunctionError) function nil.id/0 is undefined or private
        nil.id()
        (digitalcakes) Digitalcakes.Imagable.storage_dir/2
        lib/arc/storage/s3.ex:5: Arc.Storage.S3.put/3
        (elixir) lib/task/supervised.ex:94: Task.Supervised.do_apply/2
        (elixir) lib/task/supervised.ex:45: Task.Supervised.reply/5
        (stdlib) proc_lib.erl:240: :proc_lib.init_p_do_apply/3

defmodule Scribe.Documents.Document do
  use Ecto.Schema
  use Arc.Ecto.Schema
  import Ecto.Changeset

  @primary_key {:id, :binary_id, autogenerate: true}
  @foreign_key_type :binary_id
  schema "documents" do
    field :name, :string
    field :original_url, EctoFields.URL
...
    field :original, ScribeWeb.Document.Type
...
  end

  def changeset(document, params \\ %{}) do
    IO.inspect(params)
    document
    |> cast(params, [:name, :original_url, :storage_upload_url, :input_format, :input_password, :is_input_password_needed, :input_page_count, :input_storage_key, :upload_file_name, :is_pdf_with_text, :input_processing_expected_page_count, :input_processing_completed_page_count])
    |> cast_attachments(params, [:original])
  end
end

defmodule ScribeWeb.DocumentController do
  use ScribeWeb, :controller
  plug :requires_auth, except: [:show]

...
  def create(conn, %{"document" => %{"original_url" => original_url} = document_params}) do
    user = conn.assigns[:current_user]
    case Documents.create_document(user, document_params) do
      {:ok, document} ->
        if document.original_url do
          {:ok, document} = Documents.update_document(document, %{"original" => original_url})
        end
        conn
        |> put_flash(:info, "Importing document...")
        |> redirect(to: Routes.document_path(conn, :show, document, "html"))
      {:error, %Ecto.Changeset{} = changeset} ->
        render(conn, "new.html", changeset: changeset)
    end
  end
...
end

defmodule ScribeWeb.Document do
  use Arc.Definition
  # Include ecto support:
  use Arc.Ecto.Definition

...
  # Override the storage directory:
  def storage_dir(_version, {_file, scope}) do
    IO.puts("Here")
    "#{scope.id}"
  end
...
end