Routing with a custom slug

Questions & Help Questions
,
3

Ecto will likely raise an error if you try to cast a plain string as UUID so I suggest to determine the datatype on the application level:

live "/records/:opaque_id", RecordsLive.Show

def get_record(opaque_id) do
  Record
  |> where(^opaque_id_to_query(opaque_id))
  |> Repo.one()
end

defp opaque_id_to_query(opaque_id) do
  cond do
    match?({_, ""}, Integer.parse(opaque_id)) -> [id: opaque_id]
    match?({:ok, _}, Ecto.UUID.cast(opaque_id)) -> [uuid: opaque_id]
    true -> [slug: opaque_id]
  end
end