Editions are unique if name, platform OR year is different

games/migrations/0033_alter_edition_unique_together.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2.7 on 2023-11-28 13:43
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("games", "0032_alter_session_options_session_modified_at_and_more"),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name="edition",
+            unique_together={("name", "platform", "year_released")},
+        ),
+    ]

games/models.py

@@ -34,7 +34,7 @@ class Game(models.Model):
 
 class Edition(models.Model):
     class Meta:
-        unique_together = [["name", "platform"]]
+        unique_together = [["name", "platform", "year_released"]]
 
     game = models.ForeignKey("Game", on_delete=models.CASCADE)
     name = models.CharField(max_length=255)