ecto, preloadでソート

gistfile1.txt

child_query = from c in Child, order_by: c.code

query = from p in Parent,
  where p.id == ^id,
  order_by: p.date,
  preload: [child: ^child_query]
  
case Repo.all(query) do
  nil -> {:not_found}
  record -> {:ok, record}
end