Django 入门学习总结5

修改polls/detail.html文件，写一个表单：

    {% csrf_token %}
   

       

{{ question.question_text }}

        {% if error_message %}

{{ error_message }}

{% endif %}
        {% for choice in question.choice_set.all %}
           
            {{ choice.choice_text }}

        {% endfor %}
   

   
   

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("/", views.DetailView.as_view(), name="detail"),
    path("/results/", views.ResultsView.as_view(), name="results"),
    path("/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。