Fix Waffle.Ecto.Type load and dump in embeds

lib/waffle_ecto/definition.ex

@@ -56,6 +56,7 @@ defmodule Waffle.Ecto.Definition do
         def cast(value), do: Waffle.Ecto.Type.cast(unquote(definition), value)
         def load(value), do: Waffle.Ecto.Type.load(unquote(definition), value)
         def dump(value), do: Waffle.Ecto.Type.dump(unquote(definition), value)
+        def embed_as(format), do: Waffle.Ecto.Type.embed_as(unquote(definition), format)
       end
 
       def url({%{file_name: file_name, updated_at: updated_at}, scope}, version, options) do

lib/waffle_ecto/type.ex

@@ -72,5 +72,7 @@ defmodule Waffle.Ecto.Type do
     dump(definition, %{file_name: file_name, updated_at: updated_at})
   end
 
+  def embed_as(_definition, _format), do: :dump
+
   defp log_error(error), do: Logger.error(inspect(error))
 end

test/type_test.exs

@@ -37,4 +37,30 @@ defmodule WaffleTest.Ecto.Type do
     {:ok, dumped_type} = DummyDefinition.Type.dump(value)
     assert dumped_type == "file.png"
   end
+
+  test "dumps as embedded type to a string" do
+    timestamp = NaiveDateTime.from_erl!({{1970, 1, 1}, {0, 0, 0}})
+
+    assert {:ok, value} =
+      Ecto.Type.embedded_dump(
+        DummyDefinition.Type,
+        %{file_name: "file.png", updated_at: timestamp},
+        :json
+      )
+
+    assert value == "file.png?62167219200"
+  end
+
+  test "loads as embedded type from a string" do
+    timestamp = NaiveDateTime.from_erl!({{1970, 1, 1}, {0, 0, 0}})
+
+    assert {:ok, value} =
+      Ecto.Type.embedded_load(
+        DummyDefinition.Type,
+        "file.png?62167219200",
+        :json
+      )
+
+    assert value == %{file_name: "file.png", updated_at: timestamp}
+  end
 end