Update Links.create_one to use a function.

CHANGELOG.org

@@ -46,3 +46,4 @@
 
 ** 0.5.1 <2023-08-04 Fri>
     Add a generator for Link with random shorten.
+    Update Links.create_one to use a function.

lib/link_shortener/links/links.ex

@@ -4,13 +4,12 @@ defmodule LinkShortener.Links do
   import Ecto.Query
   alias LinkShortener.Repo
   alias LinkShortener.Links.Link
-  alias LinkShortener.Generators.SafeString
+  alias LinkShortener.Generators.LinkWithRandomShorten, as: LinkGenerator
 
   def new_one(), do: Link.changeset(%Link{}, %{})
 
-  def create_one(attrs, length \\ 10, generator \\ SafeString) do
-    shorten = generator.generate(length)
-    Map.put(attrs, :shorten, shorten)
+  def create_one(attrs, length \\ 10, generator \\ &LinkGenerator.generate_one/2) do
+    generator.(attrs, length)
     |> insert_one()
   end