django - 在 django 中赋值之前引用的局部变量“stockqty”

Question

请问我如何解决分配前引用的错误局部变量'stockqty'。我在我的一个模型中有一个保存方法，它搜索一个项目并返回一些值，如数量、价格、成本等，但我一直收到这个错误。

def保存（自我）：

    callitems=Item.objects.filter(subcategory=self.ItemName)

    for callitem in callitems:
        stockqty=callitem.quantity
        #stovkqty.append(callitem.quantity)
        price=callitem.unitprice
        #price.append(callitem.unitprice)
        cost=callitem.unitcost
        #cost.append(callitem.unitcost)
        vat=callitem.tax.rate
    if self.quantity < stockqty: the error complain is here
        if self.discount==True:
            self.total= self.discountprice * self.quantity
            self.profit=self.total-(cost * self.quantity)
            self.salesdate=date.today()
            self.salestime=datetime.now()
            self.staff='admin'
            Item.objects.filter(subcategory=self.ItemName).update(quantity=stockqty-self.quantity)
        else:
            self.total= price * self.quantity
            self.profit=self.total-(cost * self.quantity)
            self.salesdate=date.today()
            self.salestime=datetime.now()
            self.staff='admin'
            Item.objects.filter(subcategory=self.ItemName).update(quantity=stockqty-self.quantity)
    super(RecordSales, self).save()

Answer 1

你可能有一个缩进错误。第一条if语句应该在 for 循环内，但它与它“并行”。尝试这个：

callitems=Item.objects.filter(subcategory=self.ItemName)

    for callitem in callitems:
        stockqty=callitem.quantity
        #stovkqty.append(callitem.quantity)
        price=callitem.unitprice
        #price.append(callitem.unitprice)
        cost=callitem.unitcost
        #cost.append(callitem.unitcost)
        vat=callitem.tax.rate
        if self.quantity < stockqty:    # the error complain is here
            if self.discount==True:
                self.total= self.discountprice * self.quantity
                self.profit=self.total-(cost * self.quantity)
                self.salesdate=date.today()
                self.salestime=datetime.now()
                self.staff='admin'
                Item.objects.filter(subcategory=self.ItemName).update(quantity=stockqty-self.quantity)
            else:
                self.total= price * self.quantity
                self.profit=self.total-(cost * self.quantity)
                self.salesdate=date.today()
                self.salestime=datetime.now()
                self.staff='admin'
                Item.objects.filter(subcategory=self.ItemName).update(quantity=stockqty-self.quantity)
        super(RecordSales, self).save()