[英]Checking in views whether the object passed in context exists or not
I am working on a basic django website.我正在开发一个基本的 django 网站。 I am having a cart view as following:我的购物车视图如下:
def cart(request):
customer=request.user.customer
order, created=Order.objects.get_or_create(customer=customer, complete=False)
items=order.orderitem_set.all()
context={
'items':items,
'order':order,
'types' : Category.objects.all(),
}
return render(request,"cart.html",context)
The items is the products that the customer has in his cart. items 是客户购物车中的产品。 I want to perform a check whether if the cart is empty(that is there are no items) then I can show a message that cart is empty and then can redirect to a certain page.我想检查购物车是否为空(即没有商品),然后我可以显示一条消息,说明购物车为空,然后可以重定向到某个页面。 I am trying to find a way to perform this check and show a message that cart is empty.我试图找到一种方法来执行此检查并显示购物车为空的消息。 Any help would be appreciated.任何帮助,将不胜感激。 Thanks.谢谢。
check exists()
--(django doc)检查exists()
——(django 文档)
context={
'is_empty':order.orderitem_set.exists(),
'items':items,
'order':order,
'types' : Category.objects.all(),
}
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