Parse matching record fields in Records.Record

lib/music_library/listening_stats.ex

@@ -599,22 +599,6 @@ defmodule MusicLibrary.ListeningStats do
   defp parse_matching_records(json) when is_binary(json) do
     json
     |> JSON.decode!()
-    |> Enum.map(fn record ->
+    |> Enum.map(&Record.parse_matching_record/1)
-      %{
-        id: record["id"],
-        title: record["title"],
-        format: record["format"],
-        type: record["type"],
-        purchased_at: parse_purchased_at(record["purchased_at"]),
-        cover_hash: record["cover_hash"]
-      }
-    end)
-  end
-
-  defp parse_purchased_at(nil), do: nil
-
-  defp parse_purchased_at(dt_string) do
-    {:ok, dt, _offset} = DateTime.from_iso8601(dt_string)
-    dt
   end
 end

lib/music_library/records/record.ex

@@ -321,4 +321,30 @@ defmodule MusicLibrary.Records.Record do
   def format_as_date(dt) do
     Calendar.strftime(dt, "%d/%m/%Y")
   end
+
+  @spec parse_matching_record(map()) :: map()
+  def parse_matching_record(%{
+        "id" => id,
+        "title" => title,
+        "format" => format,
+        "type" => type,
+        "purchased_at" => purchased_at,
+        "cover_hash" => cover_hash
+      }) do
+    %{
+      id: id,
+      title: title,
+      format: String.to_existing_atom(format),
+      type: String.to_existing_atom(type),
+      purchased_at: parse_datetime(purchased_at),
+      cover_hash: cover_hash
+    }
+  end
+
+  defp parse_datetime(nil), do: nil
+
+  defp parse_datetime(dt_string) do
+    {:ok, dt, _offset} = DateTime.from_iso8601(dt_string)
+    dt
+  end
 end