67 lines
2.7 KiB
Python
67 lines
2.7 KiB
Python
from datetime import datetime
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from decimal import Decimal
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from django.db import models
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from django.utils import timezone
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from django.db.models import F, Case, When, Max, ExpressionWrapper, Subquery, OuterRef
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from users.models import BetTransaction
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class AuctionManager(models.Manager):
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def get_queryset(self):
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return super().get_queryset().annotate(
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_end_time=ExpressionWrapper(
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F('initial_end_time') + F('last_call_delta') * F('times_postponed'),
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output_field=models.DateTimeField()
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)
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).annotate(_is_active=Case(
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When(_end_time__gt=timezone.now(), then=True),
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default=False,
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)).annotate(
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_min_bet_value=Case(
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When(bets__isnull=True, then=F('initial_cost')),
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default=Subquery(BetTransaction.objects.filter(bet__auction=OuterRef('pk')).order_by('-value').values('value')[:1]) + Decimal('0.01')
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)
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).distinct()
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class Auction(models.Model):
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class Meta:
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verbose_name = 'Аукцион'
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verbose_name_plural = 'Аукционы'
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product = models.ForeignKey('auction.Product', related_name='auctions', on_delete=models.CASCADE,
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verbose_name='Товар')
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quantity = models.PositiveIntegerField(verbose_name='Количество победителей')
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betters = models.ManyToManyField('users.TGUser', through='auction.Bet', related_name='auctions',
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verbose_name='Поставившие ставку')
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initial_end_time = models.DateTimeField(verbose_name='Изначальная дата окончания')
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last_call_delta = models.DurationField(verbose_name='Время последнего шага')
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times_postponed = models.IntegerField(default=0, verbose_name='Количество переносов')
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commission = models.DecimalField(decimal_places=2, max_digits=5, verbose_name='Комиссия',
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help_text='Десятичная дробь')
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initial_cost = models.DecimalField(decimal_places=2, max_digits=102, verbose_name='Начальная стоимость')
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objects = AuctionManager()
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def __str__(self):
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return f'Аукцион №{self.pk}'
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def check_postpone(self):
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if timezone.now() - self.last_call_delta <= self.end_time <= timezone.now():
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self.times_postponed = F('times_postponed') + 1
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self.save()
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@property
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def end_time(self):
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return self._end_time
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@property
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def is_active(self):
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return self._is_active
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@property
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def min_bet_value(self):
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return self._min_bet_value
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