尝试使用django制作购物车，但在视图中我传递产品ID而不是slug因为我直接从主页添加产品到购物车

购物车应用

views.py

from django.shortcuts import render, HttpResponseRedirect
from django.core.urlresolvers import reverse
# Create your views here.

from products.models import Product
from .models import Cart 

def view(request):
   cart = Cart.objects.all()[0]
   context = {"cart": cart}
   template = "cart/view.html"
   return render(request, template, context)

def update_cart(request, id):
   cart = Cart.objects.all()[0]
   try:
       product = Product.objects.get(id=id)
   except Product.DoesNotExist:
       pass
   except:
       pass
   if not product in cart.products.all():
       cart.products.add(product)
   else:
       cart.products.remove(product)

   return HttpResponseRedirect(reverse("cart"))

urls.py

from django.conf import settings
from django.conf.urls import patterns, include, url
from django.conf.urls.static import static
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
   # Examples:
    url(r'^$', 'products.views.home', name='home'),
    url(r'^products/$', 'products.views.home', name='products'),
    url(r'^cart/products/$', 'carts.views.update_cart', name='update_cart'),
    url(r'^cart/$', 'carts.views.view', name='cart'),
    url(r'^admin/', include(admin.site.urls)),
) 

if settings.DEBUG:
    urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

base.html

<p><a href='{% url "update_cart" product.id %}' class="btn btn-primary" role="button">Add to cart</a> </p>

据我说，urls.py有一些错误

Error

NoReverseMatch at / products /反向'update_cart'，参数'（1，）'和关键字参数'{}'未找到 . 1个模式尝试：['carts / products / $']请求方法：GET请求URL：http：//127.0.0.1：8000 / products / Django版本：1.6.5异常类型：NoReverseMatch异常值：反向找不到带有参数'（1，）'和关键字参数'{}'的'update_cart' . 尝试了1种模式：['$ carts / products / $']异常位置：/Users/apulgupta/Desktop/table1.2/lib/python2.7/site-packages/django/core/urlresolvers.py in _reverse_with_prefix ，第452行Python可执行文件：/Users/apulgupta/Desktop/table1.2/bin/python Python版本：2.7.10 Python路径：['/ Users/apulgupta/Desktop/table1.2/table1_2'，'/ Users / apulgupta /Desktop/table1.2/lib/python27.zip'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7 / plat-darwin'，'/ Users / apulgupta/Desktop/table1.2/lib/python2.7/plat-mac'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7 / plan -mac / lib-scriptpackages'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7 / lib -tk'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7 / lib -old '，'/ Users / apulgupta/Desktop/table1.2/lib/python2.7/lib-dynload'，'/ System / Library / Frameworks / Pepy.framework / Version / 1.7 / lib / python2.7'，'/系统/库/框架/ Python.framework / Versions / 2.7 / lib / python2.7 / plat-darwin'，'/ System / Library / Fra meworks / Python.framework / Versions / 2.7 / lib / python2.7 / lib-tk'，'/ System / Library / Frame /Python.framework / Version / 7.7 / lib / python2.7 / plat-mac'，'/ System / Library / Frameworks / Python.framework / Versions / 2.7 / lib / python2.7 / plat-mac / lib-scriptpackages'，'/ Users / apulgupta /Desktop / table1.2 / lib / python2.7 / site -packages ']服务器时间：星期二，2017年2月28日00:23:35 0530模板渲染期间出错在模板/Users/apulgupta/Desktop/table1.2/table1_2/templates/base.html中，第83行出现错误'update_cart'的反向参数'（1，）'和关键字参数'{}'找不到 . 尝试过1种模式：['$ carts / products / $']