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官方的django民意調查教程很簡單，但它必須手動處理POST異常，以及硬編碼前端。如何通過使用表單來獲得相同的結果？如何通過使用表單等效地實現官方django民意調查的例子？
@csrf_protect
def vote(request, question_id):
p = get_object_or_404(Question, pk=question_id)
if request.method == 'GET':
return render(request, 'polls/detail.html', {
'question': p,
})
if request.method == 'POST':
try:
selected_choice = p.choice_set.get(pk=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
# Redisplay the question voting form.
return render(request, 'polls/detail.html', {
'question': p,
'error_message': "You didn't select a choice.",
})
else:
selected_choice.votes += 1
selected_choice.save()
return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))
#urls.py
url(r'^(?P<question_id>[0-9]+)/vote/$', views.vote, name='vote'),
#models.py
class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
def __str__(self):
return self.question_text
def was_published_recently(self):
return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
class Choice(models.Model):
question = models.ForeignKey(Question)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
def __str__(self):
return self.choice_text
# 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>
我想這樣做來緩解這一進程：
if form.is_valid():
...
votes += 1
和 {{ form }}在{{ form }}能夠檢測Choice.DoesNotExist，默認情況下提供任何錯誤消息的模板。