Django表单

新建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>

新建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>

修改polls包里面的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 polls.models import Question, Choice


# Create your views here.


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

    def get_queryset(self):
        """返回最后五个已发布的问题."""
        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:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # 重新发布投票问题表单
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        # 成功处理post数据后，始终返回HttpResponseRedirect
        # 如果用户点击后退按钮，这将防止两次发布数据。
        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

修改polls包里面的polls_urls.py

from django.urls import path
from . import views

app_name = 'polls'

urlpatterns = [
    path('', views.IndexView.as_view(), name='index'),
    # 示例：/polls/

    path('<int:pk>/', views.DetailView.as_view(), name='detail'),
    # 示例：/polls/5/

    path('<int:pk>/results/', views.ResultsView.as_view(), name='results'),
    # 示例：/polls/5/results/

    path('<int:question_id>/vote/', views.vote, name='vote'),
    # 示例：/polls/5/vote/
]

python manage.py runserver

启动服务

http://127.0.0.1:8000/polls/