Python Django：使用参数'('',)'和关键字参数'{}'未找到'detail'的反转
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Django: Reverse for 'detail' with arguments '('',)' and keyword arguments '{}' not found
提问by fromPythonImportNoob
I'm following the official tutorial to learn Django and using 1.5.
我正在按照官方教程学习 Django 并使用 1.5。
I had this link as part of my index template, which was working fine:
我将此链接作为索引模板的一部分，它运行良好：
<li><a href="/polls/{{ poll.id }}/">{{ poll.question }}</a></li>
however, this is hardcoded and the tutorial suggested a better way was to use:
然而，这是硬编码的，教程建议更好的方法是使用：
<li><a href="{% url 'detail' poll.id %}">{{ poll.question }}</a></li>
so that you'll be better of when dealing with huge number of templates and u have to make changes to the url.
这样你在处理大量模板时会更好，你必须对 url 进行更改。
Since I made the above change I get the following errors when I run the app:
由于我进行了上述更改，因此在运行应用程序时出现以下错误：
Exception Type: NoReverseMatch
Exception Value: Reverse for 'detail' with arguments '('',)' and keyword arguments '{}' not found.
My urls.py looks like this:
我的 urls.py 看起来像这样：
from django.conf.urls import patterns, url
from polls import views
urlpatterns = patterns('',
url(r'^$', views.index, name='index'),
url(r'^(?P<poll_id>\d+)/$', views.detail, name='detail'),
url(r'^(?P<poll_id>\d+)/results/$', views.results, name='results'),
url(r'^(?P<poll_id>\d+)/vote/$', views.vote, name='vote'),
)
views.py looks like this:
views.py 看起来像这样：
from django.shortcuts import render, get_object_or_404
from django.http import Http404
from polls.models import Poll
def index(request):
latest_poll_list = Poll.objects.order_by('-pub_date')[:5]
context = {'latest_poll_list': latest_poll_list}
return render(request, 'polls/index.html', context)
def detail(request, poll_id):
poll = get_object_or_404(Poll, pk = poll_id)
return render(request, 'polls/detail.html', {'poll': poll})
my index.html template looks like this:
我的 index.html 模板如下所示：
{% if latest_poll_list %}
<ul>
{% for poll in latest_poll_list %}
<li><a href="{% url 'polls:detail' poll_id %}">{{ poll.question }}</a></li>
{% endfor %}
</ul>
{% else %}
<p> No polls are available.</p>
{% endif %}
Usually I could easily read where the error is coming from and deal with it but in this case I can't spot the cause of the error hence I'm unable to progress with my study. Any help will be greatly appreciated.
通常我可以轻松地读取错误的来源并进行处理，但在这种情况下，我无法发现错误的原因，因此我无法继续学习。任何帮助将不胜感激。
采纳答案by Thijs van Dien
In your index.htmlyou gave poll_idas an argument, but that's just the name the argument will have within the detailfunction; it is not defined in your template. The actual value you want to call the function with is probably poll.id.
在你的参数中，index.html你给出了poll_id一个参数，但这只是参数在detail函数中的名称；它没有在您的模板中定义。您想要调用函数的实际值可能是poll.id.
回答by sam
I struggled with this for a while. Then I noticed I had put poll.id and not Poll.id with a (capital P)
我为此挣扎了一段时间。然后我注意到我把 poll.id 而不是 Poll.id 用（大写 P）
回答by Vanuan
This happened to me when I was reading tutorial. I didn't change poll_id to pk:
这在我阅读教程时发生在我身上。我没有将 poll_id 更改为 pk：
url(r'^(?P<poll_id>\d+)/$', views.DetailView.as_view(), name='detail'),
vs
对比
url(r'^(?P<pk>\d+)/$', views.DetailView.as_view(), name='detail'),
回答by dmvianna
My mistake was a typo on detail.html:
我的错误是打错了detail.html：
<form action={% url 'polls:vote' polls.id %}" method="post">
should have been
本来应该
<form action={% url 'polls:vote' poll.id %}" method="post">
It took a while for me to realise the django traceback pagewas pointing me to the relevant line of code the whole time. :$
我花了一段时间才意识到django 回溯页面一直将我指向相关的代码行。:$
回答by VeganxEdge
also, in
还有，在
polls/urls.py
民意调查/网址.py
i had spelling error
我有拼写错误
url(r'^(?P[0-9]+)/$', views.detail, name='details'),
url(r'^(?P[0-9]+)/$', views.detail, name='detail s'),
vs the correct code
vs正确的代码
url(r'^(?P[0-9]+)/$', views.detail, name='detail'),
url(r'^(?P[0-9]+)/$', views.detail, name='detail'),
spent some time looking for the error, so look for proper spelling. lol
花了一些时间寻找错误，因此请寻找正确的拼写。哈哈
回答by Sharath K P
The error got sorted out for me after correcting the filter condition in views.py.
更正views.py 中的过滤条件后，该错误已为我解决。
snippet of my views.py
我的views.py的片段
def post_share(request, post_id):
post = get_object_or_404(Post, id=post_id, status='Published')
snippet from my models.py
我的models.py中的片段
class Post(models.Model):
STATUS_CHOICES=(
('draft','Draft'),
('published','Published'),
)
1st value is stored in the database and the second value is for displaying to the users.
第一个值存储在数据库中，第二个值用于向用户显示。
raw data from my mysql DB
来自我的 mysql 数据库的原始数据
+---------------------------------------+-----------+
| title | status |
+---------------------------------------+-----------+
| Revolution 2020 | published |
| harry potter and the sorcerer's stone | published |
| harry potter and the cursed child | draft |
| five point someone | published |
| half girlfriend | draft |
| one night at the call center | published |
| Django by example | published |
+---------------------------------------+-----------+
When I had used "published", I was getting the said error. Once I changed the filter to "Published" it all sorted out.
当我使用“已发布”时，我收到了上述错误。一旦我将过滤器更改为“已发布”，一切就都解决了。
