尝试使用django制作购物车，但在视图中，我传递的是产品id而不是slug，因为我是直接从主页向购物车添加产品

Question

购物车应用程序

视图.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有些故障。

错误

在/products/Reverse处找不到参数为“（1，）”和关键字参数为“｛｝”的“update_cart”的NoReverseMatch。尝试了1个模式：['carts/products/$']请求方法：GET请求URL:http://127.0.0.1:8000/products/Django版本：1.6.5异常类型：NoReverseMatch异常值：找不到具有参数“（1，）”和关键字参数“｛｝”的“update_cart”的反向。尝试了1个模式：[“$carts/products/$”]异常位置：/Users/apulgupta/Desktop/table1.2/lib/python2.7/site-packages/django/core/urlresolvers。reverse_ with_ prefix中的py，第452行Python可执行文件：/Users/apulgupta/Desktop/table1.2/bin/pythonPythonVersion:2.7.10PythonPath:[“/Users/apulgupta/Desktop/table1.2/table1_2'，”/Users/apulgupta/Desktop/table1.2/lib/python27.zip'，”/用户/apugupta/桌面/table1.2/lib/ppython2.7'，“/Users/apulgutta/桌面/表1.2/lib/python2.7/plat darwin”，“/Users/apulkupta/Desktop/表1.2/库/python2.7/平台mac”，”/Users/apulgupsta/Desktop/表1.2/lib/pyton2.7/plat-mac”，ulgupta/Desktop/table1.2/lib/python2.7/lib tk'，“/Users/apulgupta/Desktop/table1.2/lib/python2.7/lib-old'，”/Users/apulgupta/Desktop/ttable1.2/lib/python2.7/lib dynload'，“/System/Library/Frameworks/Python.Frameworks/Versions/2.7/lib/ppython2.7'，”/System/Library/Framworks/Python.framework/Versions/2.7/lib/python2.7/plat darwin'，“/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac”，“/Systystem/LLibrary/Frameworks/Python.framework/Version/2.7/lib/pyton2.7/plat-mac/lib-scriptpackages”，“/Users/apulgupta/Desktop/table1.2/lib/ppython2.7/site-packages”]服务器时间：2017年2月28日星期二00:23:35 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 行的错误为“update_cart”，参数为 “（1，）”和关键字参数“{}”，找不到。已尝试 1 种模式： ['$carts/产品/$']

Answer 1

您应该添加正则表达式来捕获 ID。

所以网址应该是

url(r'^cart/products/(?P<product_id>\d+)$', 'carts.views.update_cart', name='update_cart'),

并使用views.py中的id

Answer 2

回溯指向问题url模式：“^$carts/products/$”。您在开头有一个杂乱的$符号，这意味着模式的其余部分将不匹配。