Django教程第四部分

写一个简单的表格

让我们从上一个教程更新我们的民意调查详细信息模板（“polls / detail.html”），以便模板包含一个HTML 元素：

<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>

现在，让我们创建一个Django视图来处理提交的数据并对其进行处理。请记住，在教程3中，我们为包含以下行的民意调查应用程序创建了一个URLconf：

path(\'<int:question_id>/vote/\', views.vote, name=\'vote\'),

我们还创建了该vote()函数的虚拟实现。让我们创建一个真实版本。将以下内容添加到polls/views.py：

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,)))

在某人投票问题后，该vote()视图会重定向到问题的结果页面。让我们写下这个观点：

from django.shortcuts import get_object_or_404, render


def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, \'polls/results.html\', {\'question\': question})

现在，创建一个polls/results.html模板：

<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>

未完待续…