チーム編集時の文字化け修正済み

lib/model/category.dart

@@ -19,6 +19,16 @@ class NewCategory {
     required this.female,
   });
 
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+          other is NewCategory &&
+              runtimeType == other.runtimeType &&
+              id == other.id;
+
+  @override
+  int get hashCode => id.hashCode;
+
   factory NewCategory.fromJson(Map<String, dynamic> json) {
     return NewCategory(
       id: json['id'] ?? 0,