[英]Restrict each user to only vote once (Polls, django, python)
I found an similar question here , but unlike there and unlike in django official tutorial , I don't have a separate Choice class. 我在这里找到了类似的问题,但与那里不同,与Django官方教程中的不同,我没有单独的Choice类。 How can I restrict every user to vote just one? 如何限制每个用户只能投票一个? What should I change in my code? 我应该更改我的代码吗?
my models.py: 我的models.py:
from django.contrib.auth.models import User
class Law(models.Model):
#some code here
yes_votes = models.IntegerField(default=0)
no_votes = models.IntegerField(default=0)
class Voter(models.Model):
user = models.ForeignKey(User)
law = models.ForeignKey(Law)
my views.py: 我的views.py:
class LawDetailView(generic.DetailView):
model = Law
template_name = 'law_detail.html'
def get_queryset(self):
"""
Excludes any petitions that aren't published yet.
"""
return Law.objects.filter(pub_date__lte=timezone.now())
class LawResultsView(generic.DetailView):
model = Law
template_name = 'law_results.html'
def law_yes_vote(request, law_id):
if Voter.objects.filter(law_id=law_id, user_id=request.user.id).exists():
return render(request, 'law_detail.html', {
'law': p,
'error_message': "Sorry, but you have already voted."
})
else:
p = get_object_or_404(Law, pk=law_id)
p.yes_votes += 1
p.save()
return HttpResponseRedirect(reverse('laws:law_results', args=(p.id,)))
def law_no_vote(request, law_id):
if Voter.objects.filter(law_id=law_id, user_id=request.user.id).exists():
return render(request, 'law_detail.html', {
'law': p,
'error_message': "Sorry, but you have already voted."
})
else:
p = get_object_or_404(Law, pk=law_id)
p.no_votes += 1
p.save()
return HttpResponseRedirect(reverse('laws:law_results', args=(p.id,)))
my law_detail.html: 我的law_detail.html:
{% if request.user.is_authenticated %}
{% if error_message %}
<h1 >{{ error_message }}</h1>
{% else %}
<div class="row" id="row-voting">
<form action="{% url 'laws:law_yes_vote' law.id %}" method="post">
{% csrf_token %}
<button class="btn btn-success" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" >
<label >YES</label>
</form>
<form action="{% url 'laws:law_no_vote' law.id %}" method="post">
{% csrf_token %}
<button class="btn btn-danger" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" >
<label >NO</label>
</form>
</div>
{% endif %}
{% else %}
<h1>Please, register</h1>
{% endif %}
It looks like you have forgotten to create the voter
instance after the user has voted. 好像您忘记了用户投票后创建voter
实例。
def law_yes_vote(request, law_id):
if Voter.objects.filter(law_id=law_id, user_id=request.user.id).exists():
return render(request, 'law_detail.html', {
'law': p,
'error_message': "Sorry, but you have already voted."
})
else:
p = get_object_or_404(Law, pk=law_id)
p.yes_votes += 1
p.save()
Voter.objects.create(law_id=law_id, user_id=request.user.id)
return HttpResponseRedirect(reverse('laws:law_results', args=(p.id,)))
You'll need to update law_no_vote
in the same way. 您需要以相同的方式更新law_no_vote
。
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