photo_controller.ex

def create(conn, %{"photo" => %{"image" => image_params} = photo_params}) do

  upload(image_params)

  case Images.create_photo(photo_params) do
    {:ok, photo} ->
      conn
      |> put_flash(:info, "Photo created successfully.")
      |> redirect(to: photo_path(conn, :show, photo))
    {:error, %Ecto.Changeset{} = changeset} ->
      render(conn, "new.html", changeset: changeset)
  end
end