python – django语法错误：关键字不能是表达式

概述我在以下代码行中遇到语法错误.我已导入数学,但我的更新功能仍无效.告诉我关键字不能是一个表达,并列举底部3行.知道我做错了什么吗？ StoreLiquor.objects.filter(storeID=ID_Store, liquorID.BottleSize='750 ML', custom=False).update(StorePrice = liquorID.ShelfPrice)Sto 我在以下代码行中遇到语法错误.我已导入数学,但我的更新功能仍无效.告诉我关键字不能是一个表达,并列举底部3行.知道我做错了什么吗？

Storeliquor.objects.filter(storeID=ID_Store,liquorID.BottleSize='750 ML',custom=False).update(StorePrice = liquorID.ShelfPrice)Storeliquor.objects.filter(storeID=ID_Store,custom=False).update(StorePrice = (float(liquorID.OffPremisePrice)) + (float(S750Increase)))Storeliquor.objects.filter(storeID=ID_Store,custom=False).update(StorePrice = (float(liquorID.OffPremisePrice) * (float(S750Increase)/100)) + float(liquorID.OffPremisePrice))

解决方法 你不能在参数名中使用点,所以这部分liquorID.BottleSize =’750 ML’会导致SyntaxError

在过滤器中使用相关模型使用跨越关系的查找

https://docs.djangoproject.com/en/dev/topics/db/queries/#lookups-that-span-relationships

Django offers a powerful and intuitive way to “follow” relationships in lookups,taking care of the sql JOINs for you automatically,behind the scenes. To span a relationship,just use the fIEld name of related fIElds across models,separated by double underscores,until you get to the fIEld you want.

所以你的陈述应该是这样的：

Storeliquor.objects.filter(storeID=ID_Store,liquorID__BottleSize='750 ML',custom=False).update(StorePrice=liquorID__ShelfPrice)

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