76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
from django.shortcuts import render, redirect
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from cart.models import Goods
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def index(request):
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goods_list = list(Goods.objects.all())
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return render(request, 'goods.html', {'goods_list': goods_list})
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class CartItem(object):
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"""购物车中的商品项"""
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def __init__(self, goods, amount=1):
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self.goods = goods
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self.amount = amount
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@property
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def total(self):
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return self.goods.price * self.amount
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class ShoppingCart(object):
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"""购物车"""
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def __init__(self):
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self.items = {}
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def add_item(self, item):
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if item.goods.id in self.items:
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self.items[item.goods.id].amount += item.amount
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else:
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self.items[item.goods.id] = item
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def remove_item(self, id):
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if id in self.items:
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self.items.remove(id)
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def clear_all_items(self):
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self.items.clear()
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@property
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def cart_items(self):
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return self.items.values()
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@property
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def total(self):
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val = 0
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for item in self.items.values():
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val += item.total
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return val
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def add_to_cart(request, id):
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goods = Goods.objects.get(pk=id)
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# 通过request对象的session属性可以获取到session
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# session相当于是服务器端用来保存用户数据的一个字典
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# session利用了Cookie保存sessionid
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# 通过sessionid就可以获取与某个用户对应的会话(也就是用户数据)
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# 如果在浏览器中清除了Cookie那么也就清除了sessionid
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# 再次访问服务器时服务器会重新分配新的sessionid这也就意味着之前的用户数据无法找回
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# 默认情况下Django的session被设定为持久会话而非浏览器续存期会话
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# 通过SESSION_EXPIRE_AT_BROWSER_CLOSE和SESSION_COOKIE_AGE参数可以修改默认设定
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# Django中的session是进行了持久化处理的因此需要设定session的序列化方式
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# 1.6版开始Django默认的session序列化器是JsonSerializer
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# 可以通过SESSION_SERIALIZER来设定其他的序列化器(例如PickleSerializer)
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cart = request.session.get('cart', ShoppingCart())
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cart.add_item(CartItem(goods))
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request.session['cart'] = cart
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return redirect('/')
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def show_cart(request):
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cart = request.session.get('cart', None)
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return render(request, 'cart.html', {'cart': cart})
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