反转&#39;结果&#39;有参数&#39;(&#39;&#39;,)&#39;未找到。尝试了1种模式:[&#39;民意调查/(?P <pk> [0-9] +)/结果/ $&#39;]

时间:2017-10-06 12:30:16

标签: python django

我在他们的网站上开始了Django教程的通用视图部分,我不断收到此错误。我知道之前已经问过这个问题,但这些答案并没有解决我的问题。我想知道有没有看到错误?我已经删除了导入以整理代码。

urls.py:

app_name = 'polls'
urlpatterns = [
    url(r'^$', views.IndexView.as_view(), name='index'),
    url(r'^(?P<pk>[0-9]+)/$', views.DetailView.as_view(), name='detail'),
    url(r'^(?P<pk>[0-9]+)/results/$', views.ResultsView.as_view(), 
    name='results'),
    url(r'^(?P<question_id>[0-9]+)/vote/$', views.vote, name='vote'),
]

views.py:

class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'

def get_queryset(self):
    return Questions.objects.order_by('-pub_date')[:5]


class DetailView(generic.DetailView):
    model = Questions
    template_name = 'polls/detail.html'


class ResultsView(generic.DetailView):
    model = Questions
    template_name = 'polls/results.html'


def vote(request, question_id):
    question = get_object_or_404(Questions, pk=question_id)
try:
    selected_choice = question.choice_set.get(pk=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
    return render(request, 'polls/detail.html', {
        'question': question,
        'error_message': "You didn't select a choice.",
    })
else:
    selected_choice.votes += 1
    selected_choice.save()
    return HttpResponseRedirect(reverse('polls:results', args=
    (question.id,)))

detail.html:

<h1>{{ object.question_text }}</h1>

{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}

<form action="{% url 'polls:vote' question_id=object.id %}" method="post">
{% csrf_token %}
{% for choice in object.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>

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:results' question.id %}">Vote again?</a>

1 个答案:

答案 0 :(得分:0)

您已将模型命名为Questions,而不是像教程那样命名Question。详细信息视图使用小写的模型名称作为模板中的模型实例。在您的情况下,这是questions,与使用question的模板中的教程不匹配。

这意味着您需要将context_object_name设置为'question',以便您的模板有效:

class ResultsView(generic.DetailView):
     model = Questions
     context_object_name = 'question'

或者您需要更改模板以使用questions代替question

<h1>{{ questions.question_text }}</h1>

<ul>
{% for choice in questions.choice_set.all %}
    <li>{{ choice.choice_text }} -- {{ choice.votes }} vote{{ 
    choice.votes|pluralize }}</li>
{% endfor %}
</ul>

<a href="{% url 'polls:results' questions.id %}">Vote again?</a>

将模型重命名为Question是个好主意 - Django中的标准是使用单数而不是复数来表示模型名称。如果您这样做,则必须运行makemigrations,然后migrate重命名模型。如果这会导致问题,则可能更容易删除迁移和数据库,然后在新数据库上运行makemigrationsmigrate