python - 未找到参数 'detail' ',)' 的 NoReverseMatch at/Reverse。尝试了 1 个模式 :

Question

我正在逐步遵循 django 教程，但无法找出为什么会出现此错误:

NoReverseMatch at /polls/

Reverse for 'detail' with arguments '('',)' not found. 1 pattern(s) tried: ['polls/(?P<pk>[0-9]+)/$']

我的代码(基本上是从教程复制的所有内容 - https://docs.djangoproject.com/en/3.0/intro/tutorial03/ ) View .py:

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 (not including those set to be
    published in the future).
    """
    return Question.objects.filter(
        pub_date__lte=timezone.now()
    ).order_by('-pub_date')[:5]

民意调查/urls.py

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/index.html

<li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>

Answer 1

QuerySet 在模板中作为 latest_question_list 传递，这是 Question 对象的集合，因此你应该迭代:

<ul>
  {% for <b>question</b> in <b>latest_question_list</b> %}
    <li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
  {% endfor %}
</ul>