Add value field to MusicGameOrder and update score calculation logic

game/migrations/0022_musicgameorder_value.py

@@ -0,0 +1,17 @@
+# Generated by Django 5.2.3 on 2025-06-15 12:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("game", "0021_alter_musicgameresults_score"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="musicgameorder",
+            name="value",
+            field=models.PositiveIntegerField(default=0),
+        ),
+    ]

game/models.py

@@ -1,5 +1,6 @@
 from django.contrib.auth.models import User
 from django.db import models
+from django.db.models import F
 from django.db.models.functions import Lower
 from django.db.models.signals import post_delete, post_save
 from django.dispatch import receiver
@@ -106,6 +107,17 @@ class MusicGameOrder(models.Model):
     player = models.ForeignKey(User, on_delete=models.CASCADE)
     music_video = models.ForeignKey(MusicVideo, on_delete=models.CASCADE)
     order = models.PositiveIntegerField()
+    value = models.PositiveIntegerField(default=0)
+
+    def update_value(self):
+        n_right = self.musicgameanswer_set.filter(game__player=F("answer")).count()
+        if n_right == 0:
+            self.value = 1000
+        else:
+            self.value = 1000 / (
+                1 + ((n_right - 1) / (self.game.players.count() - 1)) ** 0.5
+            )
+        self.save()
 
     class Meta:
         constraints = [
@@ -117,6 +129,17 @@ class MusicGameOrder(models.Model):
         ordering = ["order"]
 
 
+class AnswerManager(models.Manager):
+    def score(self, game, player):
+        qs = self.filter(game__game=game, game__player=player)
+        return (
+            qs.filter(answer=F("game__player"))
+            .aggregate(score=models.Sum("game__value", default=0))
+            .get("score")
+            - 500 * qs.exclude(game__player=F("answer")).count()
+        )
+
+
 class MusicGameAnswer(models.Model):
     game = models.ForeignKey(MusicGameOrder, on_delete=models.CASCADE)
     player = models.ForeignKey(User, on_delete=models.CASCADE)
@@ -124,6 +147,8 @@ class MusicGameAnswer(models.Model):
         User, on_delete=models.SET_NULL, null=True, related_name="+"
     )
 
+    objects = AnswerManager()
+
     class Meta:
         constraints = [
             models.UniqueConstraint(fields=("game", "player"), name="unique_answer"),

game/views.py

@@ -9,7 +9,7 @@ from django.contrib.auth.models import User
 from django.contrib.messages.views import SuccessMessageMixin
 from django.core.exceptions import PermissionDenied
 from django.db import IntegrityError
-from django.db.models import Count, F, Q
+from django.db.models import Count, Q
 from django.shortcuts import get_object_or_404, redirect
 from django.views import View
 from django.views.generic import TemplateView
@@ -471,33 +471,11 @@ class GameEndView(LoginRequiredMixin, SingleObjectMixin, View):
             raise PermissionDenied()
         game.over = True
 
-        value = {}
         for go in game.musicgameorder_set.all():
-            value[go.pk] = 1000 / (
-                1
-                + (
-                    (go.musicgameanswer_set.filter(game__player=F("answer")).count())
-                    - 1 / game.players.count()
-                )
-                ** 2
-            )
+            go.update_value()
 
         for player in game.players.all():
-            score = sum(
-                [
-                    value[ga.game.pk]
-                    for ga in player.musicgameanswer_set.filter(game__game=game)
-                    .exclude(game__player=player)
-                    .filter(game__player=F("answer"))
-                ]
-            )
-            score -= (
-                500
-                * player.musicgameanswer_set.filter(game__game=game)
-                .filter(game__player=player)
-                .exclude(game__player=F("answer"))
-                .count()
-            )
+            score = player.musicgameanswer_set.score(game, player)
             models.MusicGameResults.objects.create(
                 game=game, player=player, score=score
             )