line 18 and line 19 assignment does not impact outer scope established on line 1 and line 2

query.ex

    direction = :asc
    sorting = :track_number
    # direction = :desc
    # sorting = :presented_at

    media_category = Ecto.Query.from(playlist in Playlist,
    where: playlist.uuid == ^playlist_uuid,
    select: playlist.media_category)
    |> Repo.one
    |> IO.inspect

    if media_category == :livestream ||
    media_category == :motivation ||
    media_category == :movie ||
    media_category == :podcast ||
    media_category == :testimony do
      Logger.info("direction: #{direction} sorting: #{sorting}")
      direction = :desc
      sorting = :presented_at
    else
      direction = :asc
      sorting = :track_number
    end

    Logger.info("direction: #{direction} sorting: #{sorting}")

    query = from pl in Playlist,
    # join: t in MusicTitle,
    # join: c in Chapter,
    join: mi in MediaItem,
    # join: pt in PlaylistTitle,

    where: pl.uuid == ^pid_uuid,
    where: mi.playlist_id == pl.id,
    # where: pl.id == pt.playlist_id,
    where: mi.language_id == ^language_id,
    order_by: [{^direction, field(mi, ^sorting)}],