Django查询检查对象日期是否位于另一个查询集的开始日期和结束日期之间

Question

我有两个模型，并且都有用户模型的外键：

class UserCostCenter(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    cost_center = models.PositiveIntegerField()
    created_date = models.DateTimeField(auto_now_add=True)
    start_date = models.DateField(null=False, blank=False)
    end_date = models.DateField(null=True, blank=True)

class UserBooking(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    project = models.ForeignKey(Project, on_delete=models.CASCADE)
    date = models.DateField()
    hours = models.DecimalField()
    task = models.ForeignKey(UserProject, on_delete=models.DO_NOTHING, null=True, blank=True)
    created_date = models.DateTimeField(auto_now_add=True)
    updated_date = models.DateTimeField(null=True, blank=True)
    history = HistoricalRecords(table_name='booking_history_userbooking')

现在我想排除没有成本中心的用户预订 目前我正在这样做：

    queryset = UserBooking.objects.all()
    for booking in queryset:
        cost_center = UserCostCenter.objects.filter(
        Q(user=booking.user, start_date__lte=booking.date, end_date__gte=booking.date)
        | Q(user=booking.user, start_date__lte=booking.date,
            end_date=None)).first()
        if not cost_center:
            queryset = queryset.exclude(id=booking.id)

我不想使用 for 循环排除用户预订对象，请帮助！

Answer 1

您可以像这样在 UserCostCenter 中获取所有带有记录的 UserBooking：

UserBooking.objects.filter(user__in=(UserCostCenter.objects.values_list('user', flat=True)))