chore(ecto_adatper): Update decoding behavior in adapters for Ecto 3.11

lib/snowflex/ecto/ecto_adapter.ex

@@ -31,14 +31,19 @@ defmodule Snowflex.EctoAdapter do
 
   defp binary_encode(raw), do: {:ok, Base.encode16(raw)}
 
+  def decimal_decode(nil), do: {:ok, nil}
   def decimal_decode(dec) when is_binary(dec), do: {:ok, Decimal.new(dec)}
   def decimal_decode(dec) when is_float(dec), do: {:ok, Decimal.from_float(dec)}
 
+  defp int_decode(nil), do: {:ok, nil}
   defp int_decode(int) when is_binary(int), do: {:ok, String.to_integer(int)}
   defp int_decode(int), do: {:ok, int}
 
+  defp time_decode(nil), do: {:ok, nil}
   defp time_decode(time), do: Time.from_iso8601(time)
 
+  defp datetime_decode(nil), do: {:ok, nil}
+
   defp datetime_decode({date, time}) do
     with {:ok, date} <- Date.from_erl(date),
          {:ok, time} <- Time.from_erl(time) do
@@ -48,12 +53,14 @@ defmodule Snowflex.EctoAdapter do
     end
   end
 
+  defp float_decode(nil), do: {:ok, nil}
   defp float_decode(float) when is_float(float), do: float
 
   defp float_decode(float) do
     {val, _} = Float.parse(float)
     {:ok, val}
   end
 
+  defp date_decode(nil), do: {:ok, nil}
   defp date_decode(date), do: Date.from_iso8601(date)
 end

test/snowflex_ecto_adapter_test.exs

@@ -2,8 +2,18 @@ defmodule SnowflexEctoAdapterTest do
   use ExUnit.Case
 
   test "handles casting maybe date type to date" do
-    assert [date_decode, {:maybe, :date}] = Snowflex.EctoAdapter.loaders({:maybe, :date}, {:maybe, :date})
+    assert [date_decode, {:maybe, :date}] =
+             Snowflex.EctoAdapter.loaders({:maybe, :date}, {:maybe, :date})
+
     assert is_function(date_decode, 1)
     assert {:ok, ~D[2023-10-23]} = date_decode.("2023-10-23")
   end
+
+  test "handles nil values" do
+    [:integer, :utc_datetime, :naive_datetime, :decimal, :float, :date, :id, :time]
+    |> Enum.each(fn type ->
+      [decode_fn | _] = Snowflex.EctoAdapter.loaders(type, nil)
+      assert {:ok, nil} == decode_fn.(nil)
+    end)
+  end
 end