ruleset is now a required game enum parameter

lib/data/dto/game.dart

@@ -1,11 +1,12 @@
 import 'package:clock/clock.dart';
 import 'package:uuid/uuid.dart';
+import 'package:game_tracker/core/enums.dart';
 
 class Game {
   final String id;
   final DateTime createdAt;
   final String name;
-  final String? ruleset;
+  final Ruleset ruleset;
   final String description;
   final String color;
   final String? icon;
@@ -14,7 +15,7 @@ class Game {
     String? id,
     DateTime? createdAt,
     required this.name,
-    this.ruleset,
+    required this.ruleset,
     required this.description,
     required this.color,
     this.icon,
@@ -31,7 +32,7 @@ class Game {
     : id = json['id'],
       createdAt = DateTime.parse(json['createdAt']),
       name = json['name'],
-      ruleset = json['ruleset'],
+      ruleset = Ruleset.values.firstWhere((e) => e.name == json['ruleset']),
       description = json['description'],
       color = json['color'],
       icon = json['icon'];
@@ -41,7 +42,7 @@ class Game {
     'id': id,
     'createdAt': createdAt.toIso8601String(),
     'name': name,
-    'ruleset': ruleset,
+    'ruleset': ruleset.name,
     'description': description,
     'color': color,
     'icon': icon,