在django中,如何编写一个选择四个整数的所有可能组合的查询？

Question

我正在写一个游戏网站,其中抽奖是一系列四位数.例如1234

我试图在django中写一个查询,根据输入的四位数选择所有获胜者.获胜者是相同数字或相同组合的任意组合,1 2 3 4,2 3 1 4,4 1 3 2是所有获奖者.

如何编写此查询的最有效方法.

---------------------编辑,对不起这里提供的模型样本如下:-----------

class Draw(models.Model):
    digit1 = models.PositiveSmallIntegerField(null=True,blank=True)
    digit2 = models.PositiveSmallIntegerField(null=True,blank=True)
    digit3 = models.PositiveSmallIntegerField(null=True,blank=True)
    digit4 = models.PositiveSmallIntegerField(null=True,blank=True)
    draw_date = models.DateTimeField()
    closed = models.BooleanField()
    winner = models.BooleanField()

    def __unicode__(self):
        return "Draw For Week Ending %s" %(self.draw_date)

    def get_absolute_url(self):
        return "/draw/%s/" % (self.draw_date)

    def save(self, force_insert=False, force_update=False):
        if self.digit1 and self.digit2 and self.digit3 and self.digit4:
            #check if there are winners
            try:
                winners = Ticket.objects.filter(draw=self.id,digit1=self.digit1,digit2=self.digit2,digit3=self.digit3,digit4=self.digit4)
                self.winner = True
            except Ticket.DoesNotExist:
                self.winner = False                
            #close & save draw/winners
            self.closed = True
            # Add new Draw for following week.
            new_date = self.draw_date + datetime.timedelta(hours=168)
            new_draw= Draw(draw_date=new_date)
            new_draw.save()
        super(Draw, self).save(force_insert, force_update) # Call the "real" save() method.

class Serial(models.Model):
    serial = models.CharField(max_length=4)
    closed = models.BooleanField(unique=False)

    def __unicode__(self):
        return "%s" %(self.serial)

    def get_absolute_url(self):
        return "/draw/serial/%s/" % (self.serial)    

class Ticket(models.Model):
    draw = models.ForeignKey(Draw)
    digit1 = models.PositiveSmallIntegerField()
    digit2 = models.PositiveSmallIntegerField()
    digit3 = models.PositiveSmallIntegerField()
    digit4 = models.PositiveSmallIntegerField()
    date = models.DateField(auto_now_add=True,editable=False)
    active = models.BooleanField(default=True)
    serial_used = models.ForeignKey(Serial,related_name="ticket_serial_used")

    def __unicode__(self):
        return "#: %s - %s" %(self.id,self.draw)

    def get_absolute_url(self):
        return "/ticket/%s/" % (self.id)    

    def save(self, force_insert=False, force_update=False):
        if self.serial_used:
            serial = Serial.objects.get(pk=self.serial_used.id)
            serial.closed = True
            serial.save()
        super(Ticket, self).save(force_insert, force_update) # Call the "real" save() method.

Answer 1

我建议调整代码以保存数字,以便按排序顺序保存.例如,如果用户输入"5262",那么它应该将其存储为"2256".然后,当您选择一组获胜数字时,您可以对这些数字进行排序,并通过简单的相等进行过滤.这比尝试检查所有可能的组合要好得多.

如果您需要将未排序的选择用于其他目的,请将新字段添加到模型sortedDigits或其他内容,以便进行比较.