Question

我刚刚在这里找到了Django博客教程：Blog tutorial

我现在正在尝试添加一项功能，该功能将计算博客帖子收到的观看次数。为此，我将以下内容添加到views.py中（请注意，本教程中的views.py完全为空，因为它使用Django通用视图）：

def detail_view(request, object_id):
object = Post.objects.filter(id=object_id)
object.update(counter = F('counter') + 1)

return render_to_response('posts/post_detail.html', {'object':object}, context_instance=RequestContext(request))

不确定我是否正确执行了render_to_response。我的urls.py现在是：

from models import Post
queryset = {'queryset': Post.objects.order_by('-pub_date')}
urlpatterns = patterns('',
    url('^$', 'django.views.generic.list_detail.object_list', queryset, name="posts"),
    url('^(?P<object_id>\d+)/$', 'posts.views.detail_view', name="post")

我的post_list.html包含以下代码，用于创建指向post_detail.html的链接：

<a href={% url post object.id %}>{{ object.title }}</a>

完整的错误是：

> Exception Value:  
Caught NoReverseMatch while rendering: Reverse for 'post' with arguments '('',)' and keyword arguments '{}' not found.

Traceback:

> Environment:


Request Method: GET
Request URL: localhost:8000/1/

Django Version: 1.3
Python Version: 2.6.1
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.comments',
 'django.contrib.admin',
 'Blog.posts',
 'Blog.categories']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.middleware.csrf.CsrfResponseMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Template error:
In template /Users/kevin/PycharmProjects/Blog/templates/posts/_post.html, error at line 3
   Caught NoReverseMatch while rendering: Reverse for 'post' with arguments '('',)' and keyword arguments '{}' not found.
   1 : <div id=”object_{{ object.id }}”>


   2 : <h2>


   3 :     <a href= {% url post object.id %} >{{ object.title }}</a>


   4 :     <small>{{ object.pub_date|timesince }} ago</small>


   5 :     </h2>


   6 :     {{ object.body }}


   7 : </div>

Traceback:
File "/Library/Python/2.6/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/kevin/PycharmProjects/Blog/posts/views.py" in detail_view
  12.     return render_to_response('posts/post_detail.html', {'object':object}, context_instance=RequestContext(request))
File "/Library/Python/2.6/site-packages/django/shortcuts/__init__.py" in render_to_response
  20.     return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
File "/Library/Python/2.6/site-packages/django/template/loader.py" in render_to_string
  188.         return t.render(context_instance)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  123.             return self._render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/Library/Python/2.6/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/Library/Python/2.6/site-packages/django/template/loader_tags.py" in render
  127.         return compiled_parent._render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/Library/Python/2.6/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/Library/Python/2.6/site-packages/django/template/loader_tags.py" in render
  64.             result = block.nodelist.render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/Library/Python/2.6/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/Library/Python/2.6/site-packages/django/template/loader_tags.py" in render
  159.         return self.render_template(self.template, context)
File "/Library/Python/2.6/site-packages/django/template/loader_tags.py" in render_template
  141.         output = template.render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  123.             return self._render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/Library/Python/2.6/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/Library/Python/2.6/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/Library/Python/2.6/site-packages/django/template/defaulttags.py" in render
  450.                         raise e

Exception Type: TemplateSyntaxError at /1/
Exception Value: Caught NoReverseMatch while rendering: Reverse for 'post' with arguments '('',)' and keyword arguments '{}' not found.

我一直试图找出几个小时的错误，但没有找到答案。我也在SO.com上阅读了很多东西，但仍然没有运气。

非常感谢您的帮助。

谢谢！

Answer 1

尝试：

<a href="{% url post object_id=object.id %}">{{ object.title }}</a>

您需要提供参数的名称，以使反向快乐。另外，您应引用该网址。

P.S。如果您的URL条目是：

，您的原始代码将起作用

url('^(\d+)/$', 'posts.views.detail_view', name="post")

但这不是推荐的方法。

此外，看起来你应该这样做：

... , {'object':object[0]}, ...

在render_to_response来电中

。 filter只返回一个修改后的查询集，它可以与update一起使用，但在您的模板中，您将其视为一个对象，因此在将其放入上下文时应将其解析为对象。

Django NoReverseMatch博客教程修改错误

1 个答案: