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使用对角计算每日赢额
原标题:calculating daily winnings with django

我有一个代表用户赌注的模型类。 我想计算整个数据库的每日赢额( 不是单个用户 ) 。 每个用户赌注的赢额都是用公式odds * 硬币 (当结果=1)计算的 。

class UserBet(models.Model):
    user = models.ForeignKey(User)
    bet = models.ForeignKey(Bet)
    coins = models.FloatField(default=0.0) 
    placed = models.DateTimeField(editable=False) #when user places the bet
    result = models.SmallIntegerField(default=0) # 1: win, 0: no result yet, -1: lose
    odds = models.FloatField(default=0.0)
    week_number = models.SmallIntegerField(default=0)
    year = models.SmallIntegerField(default=0)
    modified = models.DateTimeField() #when result is updated

我每天得到钱币, 以取得这样的成功结果(MySql):

UserBet.ob jects. filter( 结果=1).extra({日期_修改 :"日期(修改)"}).value(日期_修改).an notate(coins_sum=Sum(硬币))

但这并不是我想要的。 每个用户放置的煤炭应该与每个用户的几率乘以乘以, 才能得到每日的赢家。

这有可能吗?

问题回答

您可以使用 方法 :

UserBet.objects.filter(result = 1).extra({ winnings : odds * coins })...




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