sandbox/django/mysite/polls/views.py

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from django.shortcuts import get_object_or_404, render
from django.http import HttpResponseRedirect
from django.urls import reverse
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from django.utils import timezone
from django.views import generic
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from .models import Choice, Question
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class IndexView(generic.ListView):
template_name = 'polls/index.html'
context_object_name = 'latest_questions'
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def get_queryset(self):
"""Returns the last five published questions."""
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return Question.objects.filter(
pub_date__lte=timezone.now(),
).order_by('-pub_date')[:5]
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class DetailView(generic.DetailView):
model = Question
template_name = 'polls/detail.html'
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def get_queryset(self):
"""Don't incluce questions that aren't published yet/"""
return Question.objects.filter(pub_date__lte=timezone.now())
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class ResultsView(generic.DetailView):
model = Question
template_name = 'polls/results.html'
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,)))