11.表单

1、给URL名称添加命名空间

from django.urls import path

from . import views

app_name = "polls" #添加命名空间

urlpatterns = [
    path("", views.index, name="index"),
    path("<int:question_id>/", views.detail, name="detail"),
    path("<int:question_id>/results/", views.results, name="results"),
    path("<int:question_id>/vote/", views.vote, name="vote"),
]

2、更新投票详细信息页面模板

# polls/templates/polls/detail.html
<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>
        {% endfor %}
    </fieldset>
    <input type="submit" value="Vote">
</form>

3、更新vote()视图函数

# polls/views.py
from django.urls import reverse
from django.http import HttpResponse, HttpResponseRedirect
from .models import Question, Choice

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):
        return render(
            request,
            "polls/detail.html",
            {
                "question": question,
                "error_message": "你没有选择任何选项",
            },
        )
    else:
        selected_choice.votes += 1
        selected_choice.save()
        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))

4、更新results()视图函数

# polls/views.py
def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, "polls/results.html", {"question": question})

5、创建一个results.html模板

# 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 %}">再次投票?</a>

6、添加选项

7、查看选项

8、修改问题描述并投票测试（其实到现在我才明白这个问题是啥意思）

9、投票测试