61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
from django.db import models
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from django.db.models import F
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from django.db.models.expressions import Window
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from django.db.models.functions import Lower, Rank, RowNumber
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class Version(models.Model):
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name = models.CharField(max_length=50, unique=True)
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created_at = models.DateTimeField(auto_now_add=True)
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def __str__(self) -> str:
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return self.name
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class ScoreQuerySet(models.QuerySet):
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def best_per_username(self) -> "ScoreQuerySet":
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"""Keep only each user's highest score, matching usernames case-insensitively.
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Lower scores are excluded from the result but remain in the database.
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"""
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best_ids = (
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self.alias(
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_row=Window(
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expression=RowNumber(),
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partition_by=Lower("username"),
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order_by=[F("points").desc(), F("created_at").asc()],
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)
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)
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.filter(_row=1)
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.values_list("pk", flat=True)
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)
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return self.filter(pk__in=best_ids)
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def with_rank(self) -> "ScoreQuerySet":
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return self.annotate(
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rank=Window(
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expression=Rank(),
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order_by=F("points").desc(),
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)
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)
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class ScoreManager(models.Manager.from_queryset(ScoreQuerySet)):
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def get_queryset(self) -> ScoreQuerySet:
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return super().get_queryset().select_related("version")
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class Score(models.Model):
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username = models.CharField(max_length=100)
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points = models.IntegerField()
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version = models.ForeignKey(Version, on_delete=models.PROTECT, related_name="scores")
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created_at = models.DateTimeField(auto_now_add=True)
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objects = ScoreManager()
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class Meta:
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ordering = ["-points"]
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def __str__(self) -> str:
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return f"{self.username}: {self.points}"
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