Question

class Ticket(models.Model):
    event = models.ForeignKey(Event)
    name = models.CharField( Name , max_length=255) 
    price =  models.FloatField( Price , blank=True)

class CartItem(models.Model):
    cart = models.ForeignKey(Cart)    
    ticket = models.ForeignKey(Ticket)
    quantity = models.IntegerField()

我怎么办。页: 1 事件数量=事件

Answer 1

你们需要添加错误检查,但你可以做这样的逻辑——智者:

total = 0
cart_items = CartItem.objects.filter(ticket__event=event) # assuming there are multiple cart items per event
for cart_item in cart_items:
    new_total = cart_item.ticket.price * cart_item.quantity
    total = total + new_total

这应当给你一笔活动的全部收入。

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