小编Vla*_*sky的帖子

def show(conn, %{"id" => id}) do
  with {:ok, user} <- UserAction.get_user(id)
    |> put_status(200)
    |> render("show.json", %{user: user})
  else
    {:error, :not_found} -> {:error, :not_found, %User{id: id}}
  end
end

当 id 无效时，Ecto引发：

Ecto.Query.CastError - cannot be dumped to type :binary_id in query. 

我的get_user功能：

query = from(u in User, where u.id == ^id)

case Repo.all(query) do
  [%User{} = user] -> {:ok, user}
  _ -> {:error, :not_found}
end

是否有任何方便的方法来处理此错误以防止 500 个响应？