NoReverseMatch at /product_view/1/ 未找到带有参数 '('',)' 的 'cart_add' 的反向。尝试了 1 种模式：[u'cart/add/(?P<pro

Posted 2023-02-23

【中文标题】NoReverseMatch at /product_view/1/ 未找到带有参数 \'(\'\',)\' 的 \'cart_add\' 的反向。尝试了 1 种模式：[u\'cart/add/(?P<product_id>\\\\d+)/$\']

【英文标题】：NoReverseMatch at /product_view/1/ Reverse for 'cart_add' with arguments '('',)' not found. 1 pattern(s) tried: [u'cart/add/(?P<product_id>\\d+)/$']NoReverseMatch at /product_view/1/ 未找到带有参数 '('',)' 的 'cart_add' 的反向。尝试了 1 种模式：[u'cart/add/(?P<product_id>\\d+)/$']

【发布时间】：2018-01-22 18:32:03

【问题描述】：

我正在创建一个在线商城，但是当我尝试加载我的产品页面时，我收到以下错误。我相信错误指向我的命名空间，但我尝试纠正它的每一种方式，我仍然得到错误

Internal Server Error: /product_view/1/
Traceback (most recent call last):
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/agozie/Desktop/shoppingmall/shop/views.py", line 18, in product_view
    'cart_product_form': cart_product_form)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/shortcuts.py", line 30, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/loader.py", line 68, in render_to_string
    return template.render(context, request)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/backends/django.py", line 66, in render
    return self.template.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 207, in render
    return self._render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 990, in render
    bit = node.render_annotated(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/loader_tags.py", line 177, in render
    return compiled_parent._render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 990, in render
    bit = node.render_annotated(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/loader_tags.py", line 72, in render
    result = block.nodelist.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 990, in render
    bit = node.render_annotated(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/defaulttags.py", line 216, in render
    nodelist.append(node.render_annotated(context))
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/template/defaulttags.py", line 458, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/urls/base.py", line 91, in reverse
    return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/urls/resolvers.py", line 497, in _reverse_with_prefix
    raise NoReverseMatch(msg)
NoReverseMatch: Reverse for 'cart_add' with arguments '('',)' not found. 1 pattern(s) tried: [u'cart/add/(?P<product_id>\\d+)/$']
[14/Aug/2017 20:29:03] "GET /product_view/1/ HTTP/1.1" 500 186275

我有两个应用程序。购物车和商店。以下是我对购物车应用的看法：

@require_POST
def cart_add(request, product_id):
    cart = Cart(request)
    product = get_object_or_404(Product, id=product_id)
    form = CartAddProductForm(request.POST)
    if form.is_valid():
        cd = form.cleaned_data
        cart.add(product=product, quantity=cd['quantity'], update_quantity=cd['update'])
    return redirect('cart:cart_detail')

def cart_remove(request, product_id):
    cart = Cart(request)
    product = get_object_or_404(Product, id=product_id)
    cart.remove(product)
    return redirect("cart:cart_detail")

def cart_detail(request):
    cart = Cart(request)
    return render(request, 'cart/detail.html', 'cart':cart)

这里是购物车应用的 urls.py

urlpatterns = [
    url(r'^$', views.cart_detail, name='cart_detail'),
    url(r'^add/(?P<product_id>\d+)/$', views.cart_add, name='cart_add'),
    url(r'^remove/(?P<product_id>\d+)/$', views.cart_remove, name='cart_remove'),
]

还有我项目的 urls.py

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^', include('shop.urls')),
    url(r'^cart/', include('cart.urls', namespace='cart')),
    url(r'^accounts/', include('registration.backends.default.urls')),
]

这是引发错误的模板

% extends 'shop/base.html' %
% load static %

% block title_block %
    Product View
% endblock %

% block body_block %
    % for p in product %
         p.name 
         p.brand 
         p.style 
        <p class="price">$ product.price </p>
        <form action="% url 'cart:cart_add' product.id %" method="post">
           cart_product_form 
          % csrf_token %
          <input type="submit" value="Add to cart">
        </form>
    % endfor %
% endblock %

【问题讨论】：

显示出现此错误的模板。

@Daniel Roseman，我已经添加了模板

% url 'cart:cart_add' product.id %% url 'cart:cart_add' product_id=product.id %。

起初我误读了您的urls 文件，并认为您使用了错误的name，而您并没有，但我还是会指出来。使用命名空间的部分好处是您可以在cart 应用程序中将您的网址命名为add 和remove，然后在模板中使用cart:add。

现在我注意到了别的东西。您使用的是product.id，但它应该是p.id。

【参考方案1】：

尝试为您的product_id 命名，因为 Django 需要 关键字参数 来解析您的 url。

在您的模板中： <form acition="% url 'cart:card_add' product_id=p.id %" method="post">

我认为this link会对你有所帮助。

此外，您正在迭代产品% for p in product %，然后您访问p.name 和其他产品，然后您访问product.price。尝试将product.id 替换为p.id（并将product.price 替换为p.price）。

【讨论】：

我这样做了，现在得到以下错误Reverse for 'cart_add' with keyword arguments 'u'product_id': ''' not found. 1 pattern(s) tried: [u'cart/add/(?P<product_id>\\d+)/$']

那么您可能没有在模板中正确呈现您的product。

@Gozie 我想我看到了你的错误。您正在迭代product (% for p in product %)，然后您访问p.name 和其他人，然后您访问product.price。尝试将product.id 替换为p.id。

很抱歉，我遇到了另一个错误。我应该将其作为另一个问题发布还是仅将其添加到评论中

最好将其添加为单独的问题并在此处留下链接，我会尽力帮助您。 :)

【参考方案2】：

我建议您将product_id 作为id 传递回模板，该模板将为您提供id。然后你就可以用它来解析反向url了。

@require_POST
def cart_add(request, product_id):
    cart = Cart(request)
    product = get_object_or_404(Product, id=product_id)
    form = CartAddProductForm(request.POST)
    if form.is_valid():
        cd = form.cleaned_data
        cart.add(product=product, quantity=cd['quantity'], update_quantity=cd['update'])
    return redirect('cart:cart_detail')

% url "product-edit" product_id %