修改polls/detail.html文件，写一个表单：
<form action="{% url 'polls:vote' question.id %}" method="post">
{% csrf_token %}
<fieldset>
<legend><h1>{{ question.question_text }}</h1></legend>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
{% 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 %}
</fieldset>
<input type="submit" value="Vote">
</form>
修改polls/views.py文件：
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from .models import Choice, Question
...
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):
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 an HttpResponseRedirect after successfully dealing
with POST data. This prevents data from being posted twice if a
user hits the Back button.
return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))
和结果方法：
def results(request, question_id):
question = get_object_or_404(Question, pk=question_id)
return render(request, "polls/results.html", {"question": question})
创建polls/results.html页面，内容为：
最好用少的代码
修改polls/urls.py文件为：
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"),
]
修改视图
修改文件polls/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"
可以重新在网址上测试下。