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tvdt/quiz/models/quiz.py

@@ -1,7 +1,12 @@
 from django.db import models
+from django.db.models import F, OuterRef, Subquery
+from django.db.models.aggregates import Count, Max, Min
+from django.db.models.functions import Coalesce
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
+from quiz.models import Candidate, Correction
+
 
 class Quiz(models.Model):
     name = models.CharField(max_length=64, verbose_name=_("name"))
@@ -12,11 +17,42 @@ class Quiz(models.Model):
         verbose_name=_("season"),
     )
 
+    dropouts = models.PositiveSmallIntegerField(
+        verbose_name=_("dropouts"),
+        default=1,
+    )
+
     def is_valid_quiz(self) -> bool:
         return True
         # Check > 0 active questions
         # Check every question 1 right answer
 
+    def get_score(self):
+        time_query = (
+            Candidate.objects.filter(id=OuterRef("id"), answers__quiz=self)
+            .annotate(time=Max("answers__created") - Min("answers__created"))
+            .values("time")
+        )
+        corrections = Correction.objects.filter(
+            quiz=self, candidate=OuterRef("id")
+        ).values("amount")
+
+        scores = (
+            Candidate.objects.filter(
+                answers__answer__is_right_answer=True,
+                answers__quiz=self,
+            )
+            .values("id", "name")
+            .annotate(
+                correct=Count("answers"),
+                corrections=Coalesce(Subquery(corrections), 0.0),
+                score=F("correct") + F("corrections"),
+                time=Subquery(time_query),
+            )
+            .order_by("-score", "time")
+        )
+        return scores
+
     def __str__(self) -> str:
         return f"{self.season.name} - {self.name}"