这是Django Docs上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”,我会收到错误消息。
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, ))
polls / 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'),
]
polls / templates / polls / 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 %}
polls / templates / polls / 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>
polls / templates / polls / 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?
答案 0 :(得分:0)
问题是您写了:
return HttpResponseRedirect(reverse('polls:results', args=question_id, ))
现在args
用于位置参数,并且在理论上可以有多个。因此它应该是项目的集合。例如:
return HttpResponseRedirect(reverse('polls:results', args=[question_id], ))
注意:他们在tutorial中写着
args=(question_id,)
。现在,这与args=question_id
不同。在Python中,(0, )
不是整数,而是包含 one 元素:0
的1元组。简而言之:括号很重要。
但是不需要做所有这些包装。 Django有一个redirect(..)
[Django-doc]快捷方式,可以更方便地构建HttpResponseRedirect
:
return redirect('polls:results', question_id)
这将*args
和**kwargs
本身作为位置和命名参数。因此,您可以编写它,就好像您是直接通过函数调用视图一样(将视图的名称放在前面)。