这是 Django Docs 的民意调查应用程序教程。
当我转到第一个问题http://127.0.0.1:8000/polls/1/时,选择一个选项并单击“投票”,我收到错误消息。
views.py:
from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from django.views import generic
from .models import Choice, Question
class IndexView(generic.ListView):
template_name = 'polls/index.html'
context_object_name = 'latest_question_list'
def get_queryset(self):
"""Return the last five published questions."""
return Question.objects.order_by('-pub_date')[:5]
class DetailView(generic.DetailView):
model = Question
template_name = 'polls/detail.html'
class ResultsView(generic.DetailView):
model = Question
template_name = 'polls/results.html'
def vote(request, question_id):
question = get_object_or_404(Question, pk=question_id)
try:
# request.POST['choice'] returns ID of the selected choice as a string
selected_choice = question.choice_set.get(pk=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
# Redisplay the question voting form.
return render(request, 'polls/detail.html', {
'question': question,
'error_message': "You didn't select a choice.",
})
else:
selected_choice.votes += 1
selected_choice.save()
# Always return a HttpResponseRedirect after successfully dealing with POST data.
# This prevents the data from being posted twice if a user hits the Back button.
return HttpResponseRedirect(reverse('polls:results', args=question_id, ))
民意调查/urls.py:
from django.urls import path
from . import views
app_name = 'polls'
urlpatterns = [
path('', views.IndexView.as_view(), name='index'),
path('<int:pk>/', views.DetailView.as_view(), name='detail'),
path('<int:pk>/results/', views.ResultsView.as_view(), name='results'),
path('<int:question_id>/vote/', views.vote, name='vote'),
]
民意调查/模板/民意调查/index.html:
{% if latest_question_list %}
<ul>
{% for question in latest_question_list %}
<li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
{% endfor %}
</ul>
{% else %}
<p>No polls are available.</p>
{% endif %}
民意调查/模板/民意调查/detail.html:
<h1>{{ question.question_text }}</h1>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
<form action="{% url 'polls:vote' question.id %}" method="post">
{% csrf_token %}
{% for choice in question.choice_set.all %}
<input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}"/>
<label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br>
{% endfor %}
<input type="submit" value="Vote"/>
</form>
民意调查/模板/民意调查/results.html:
<h1>{{ question.question_text }}</h1>
<ul>
{% for choice in question.choice_set.all %}
<li>{{ choice.choice_text }} -- {{ choice.votes }} vote{{ choice.votes|pluralize }}</li>
{% endfor %}
</ul>
<a href="{% url 'polls:detail' question.id %}">Vote again?</a>
有人可以帮忙吗?
最佳答案
问题是你写的是:
return HttpResponseRedirect(reverse('polls:results', <b>args=question_id</b>, ))
现在args
用于位置参数,并且(理论上)可以有多个。所以它应该是一个项目的集合。例如:
return HttpResponseRedirect(reverse('polls:results', args=<b>[</b>question_id<b>]</b>, ))
Note: in the tutorial they write
args=(question_id,)
. Now that is something different thanargs=question_id
. In Python a(0, )
is not an integer, but a 1-tuple containing one element:0
. In short: the brackets matter.
但是没有必要进行所有这些包装。 Django 有一个快捷方式 redirect(…)
[Django-doc] ,以更方便的方式构建 HttpResponseRedirect
:
return <b>redirect(</b>'polls:results', question_id<b>)</b>
这将 *args
和 **kwargs
本身作为位置参数和命名参数。所以你可以像直接调用 View 一样编写它( View 的名称在前面)。
关于python - Django TypeError at/polls/1/vote/_reverse_with_prefix() * 之后的参数必须是可迭代的,而不是 int,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51559298/