我正试图通过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，每当我尝试转到该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.
以下是我的观点代码：
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使用的链接到此页面的超链接：<a href="{% url 'results' %}{{ a.id }}/">{{ a.title }} - {{ a.date }}</a>出于某种原因，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，并在开始出现错误的视图的模板中添加一个链接。
Reverse for '' not found告诉您将空字符串''作为URL，但在urls.py中找不到。
a.id可能是一个空字符串。您可以"打印"{{a.id}}以查看您传递到上下文中的值
我找到了解决方案。问题出现在模板"results.html"中。有一个超链接链接到拼写错误的URL路径((名称，这可能是在模板呈现过程中导致错误的原因。当我把名字拼写正确时，效果很好。