0

我正在尝试通过 URL 将查询参数传递到 Django 视图中，如下所示：
127.0.0.1:8000/vysledky/?a_id=1

但是，每当我尝试访问该 URL 时，都会出现NoReverseMatch错误。完整的错误报告如下所示：

Request Method: GET
Request URL: http://127.0.0.1:8000/vysledky/?a_id=1

Django Version: 3.0.5
Python Version: 3.8.0
Installed Applications:
['analysis.apps.AnalysisConfig',
 'users.apps.UsersConfig',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']


Template error:
In template /Users/vojtamazur/Documents/CS_IA/mysite/analysis/templates/analysis/base.html, error at line 0
   Reverse for '' not found. '' is not a valid view function or pattern name.
   1 : <!DOCTYPE html>
   2 : <html>
   3 : <head>
   4 :     {% if title %}
   5 :         <title> Analýza - {{ title }} </title>
   6 :     {% else %}
   7 :         <title> Analýza </title>
   8 :     {% endif %}
   9 : </head>
   10 : <body>


Traceback (most recent call last):
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/mysite/analysis/views.py", line 167, in dispatch
    return super().dispatch(*args, **kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/views/generic/base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "/Users/vojtamazur/Documents/CS_IA/mysite/analysis/views.py", line 178, in get
    return render(request, self.template_name, context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 171, in render
    return self._render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 936, in render
    bit = node.render_annotated(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
    return self.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 936, in render
    bit = node.render_annotated(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
    return self.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 936, in render
    bit = node.render_annotated(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
    return self.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/defaulttags.py", line 309, in render
    return nodelist.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 936, in render
    bit = node.render_annotated(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
    return self.render(context)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/template/defaulttags.py", line 443, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/urls/base.py", line 87, in reverse
    return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
  File "/Users/vojtamazur/Documents/CS_IA/env/lib/python3.8/site-packages/django/urls/resolvers.py", line 677, in _reverse_with_prefix
    raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at /vysledky/
Exception Value: Reverse for '' not found. '' is not a valid view function or pattern name.

这是我的观点的代码：

class ResultsView(View):
    template_name = "analysis/results.html"

    def get(self, request):
        analysis_id = request.GET.get('a_id')
        analysis = Analysis.objects.get(pk=analysis_id)
        clients = analysis.client_set.all()
        context = {
            'analysis':analysis,
            'clients':clients,
        }
        return render(request, self.template_name, context)

这是我在项目的另一个页面中用来链接到该页面的超链接：
<a href="{% url 'results' %}{{ a.id }}/">{{ a.title }} - {{ a.date }}</a> 由于某种原因，当我第一次测试它时，这个设置运行良好，但在随后的测试中，它开始每次都出现这个错误。自第一次测试以来，我所做的唯一更改是添加另一个视图并在开始给出错误的视图模板中添加指向它的链接。

4

2 回答 2

0

我找到了解决方案。问题出在模板“results.html”中。有一个链接到拼写错误的 URL path() 名称的超链接，这可能导致模板呈现期间出现错误。当我正确拼写名称时，它工作正常。

于 2020-04-12T14:49:06.910 回答
0

Reverse for '' not found告诉您您将空字符串''作为 URL 提供，并且在您的urls.py.

可能a.id是一个空字符串。您可以“打印”{{a.id}}以查看已传递到上下文中的值

于 2020-04-11T10:26:18.910 回答