215 lines
6.5 KiB
Python
215 lines
6.5 KiB
Python
import uuid
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from django.db import models
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from django.db.models import Avg
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from django_extensions.db.models import TimeStampedModel
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from django.core.exceptions import ValidationError
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from django.utils import timezone
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from django.db.models.signals import post_save
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from django.dispatch import receiver # 导入receiver
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from account.models import RoleChoices, User
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from task.models import Task
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class FlagChoices(models.TextChoices):
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RED = "red", "值得展示"
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BLUE = "blue", "需要讲解"
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GREEN = "green", "优秀作品"
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YELLOW = "yellow", "需要改进"
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class ZoneChoices(models.TextChoices):
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FEATURED = "featured", "精选"
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LOW = "low", "待改进"
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PENDING = "pending", "待评"
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class Submission(TimeStampedModel):
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id = models.UUIDField(
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primary_key=True,
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default=uuid.uuid4,
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editable=False,
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)
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user = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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related_name="my_submissions",
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)
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task = models.ForeignKey(Task, on_delete=models.CASCADE)
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score = models.FloatField(default=0.0, verbose_name="分数")
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html = models.TextField(null=True, blank=True, verbose_name="HTML代码")
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css = models.TextField(null=True, blank=True, verbose_name="CSS代码")
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js = models.TextField(null=True, blank=True, verbose_name="JS代码")
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flag = models.CharField(
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max_length=10,
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choices=FlagChoices.choices,
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null=True,
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blank=True,
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default=None,
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db_index=True,
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verbose_name="标记",
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)
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raw_score = models.FloatField(default=0.0, verbose_name="原始加权分")
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zone = models.CharField(
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max_length=10,
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choices=ZoneChoices.choices,
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null=True,
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blank=True,
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default=None,
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db_index=True,
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verbose_name="分区",
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)
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view_count = models.PositiveIntegerField(default=0, verbose_name="查看次数")
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class Meta:
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ordering = ("-created",)
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def __str__(self):
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return f"{self.user.username} - {self.task.title}"
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def get_task_type(self):
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"""
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返回任务的具体类型（Challenge 或 Tutorial）
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"""
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return self.task.task_type
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def _update_zone(self, n: int):
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if n < 5:
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new_zone = ZoneChoices.PENDING
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elif self.score >= 4.0:
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new_zone = ZoneChoices.FEATURED
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elif self.score < 3.0:
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new_zone = ZoneChoices.LOW
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else:
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new_zone = None
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if self.zone != new_zone:
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self.zone = new_zone
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self.save(update_fields=["zone"])
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def update_score(self):
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ratings = list(self.ratings.select_related("user").all())
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n = len(ratings)
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if n == 0:
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self.raw_score = 0.0
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self.score = 0.0
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self.save(update_fields=["raw_score", "score"])
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self._update_zone(n)
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return
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role_weights = [
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0.5 if r.user.role == RoleChoices.SUPER
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else 0.3 if r.user.role == RoleChoices.ADMIN
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else 0.2
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for r in ratings
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]
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weighted_sum = sum(r.score * w for r, w in zip(ratings, role_weights))
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weight_total = sum(role_weights)
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self.raw_score = weighted_sum / weight_total
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C = 3
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global_mean = (
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Submission.objects.filter(raw_score__gt=0)
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.exclude(pk=self.pk)
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.aggregate(Avg("raw_score"))["raw_score__avg"]
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) or self.raw_score
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self.score = (C * global_mean + n * self.raw_score) / (C + n)
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self.save(update_fields=["raw_score", "score"])
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self._update_zone(n)
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def save(self, *args, **kwargs):
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super().save(*args, **kwargs)
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class Rating(models.Model):
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user = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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related_name="ratings",
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)
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submission = models.ForeignKey(
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Submission,
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on_delete=models.CASCADE,
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related_name="ratings",
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)
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score = models.IntegerField(default=0, verbose_name="分数")
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created = models.DateTimeField(auto_now_add=True)
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class Meta:
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unique_together = ("user", "submission")
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def __str__(self):
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return f"{self.user.username} 评分了 {self.submission.id}，分数是 {self.score}"
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def clean(self):
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"""
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在保存之前检查用户当天的评分次数
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"""
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today_start = timezone.now().replace(hour=0, minute=0, second=0, microsecond=0)
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today_end = today_start + timezone.timedelta(days=1)
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count = Rating.objects.filter(
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user=self.user, created__range=(today_start, today_end)
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).count()
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if self.user.role == RoleChoices.NORMAL and count >= 30:
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raise ValidationError("普通用户每天最多只能评分30次。")
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def save(self, *args, **kwargs):
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self.clean()
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super().save(*args, **kwargs)
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@receiver(post_save, sender=Rating)
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def update_submission_score_on_save(sender, instance, **kwargs):
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"""
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当Rating保存时，更新对应的Submission的平均分
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"""
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instance.submission.update_score()
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class ItemOrdering(models.TextChoices):
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MANUAL = "manual", "手动排序"
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AWARDED_AT = "awarded_at", "授奖时间倒序"
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SCORE = "score", "评分倒序"
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VIEW_COUNT = "view_count", "浏览量倒序"
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class Award(TimeStampedModel):
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name = models.CharField(max_length=100, unique=True, verbose_name="奖项名称")
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description = models.TextField(blank=True, default="", verbose_name="奖项简介")
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sort_order = models.IntegerField(default=0, db_index=True, verbose_name="排序值")
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is_active = models.BooleanField(default=True, verbose_name="是否启用")
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item_ordering = models.CharField(
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max_length=20,
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choices=ItemOrdering.choices,
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default=ItemOrdering.MANUAL,
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verbose_name="作品排序方式",
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)
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class Meta:
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ordering = ("sort_order",)
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def __str__(self):
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return self.name
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class SubmissionAward(TimeStampedModel):
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submission = models.ForeignKey(
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Submission, on_delete=models.CASCADE, related_name="awards"
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)
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award = models.ForeignKey(
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Award, on_delete=models.CASCADE, related_name="submission_awards"
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)
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sort_order = models.IntegerField(default=0, db_index=True, verbose_name="手动排序值")
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awarded_at = models.DateTimeField(
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auto_now_add=True, db_index=True, verbose_name="授奖时间"
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)
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class Meta:
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unique_together = ("submission", "award")
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ordering = ("sort_order",)
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def __str__(self):
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return f"{self.award.name} - {self.submission}"
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