How to increment django integer field from view? - django

Question

I'm creating a Django 1.8.4 web application to submit links with up vote and down vote functionality. But every time I click the up vote button, it applies on the last link submitted. I'm using forms to do it. The form is quite normal:
class VoteForm(forms.ModelForm):
class Meta:
model = Vote
exclude = ("vote_type", "vote_date",)
here's the model:
class Link(models.Model):
title = models.CharField(max_length=200)
...
up_votes = models.IntegerField(default=0, blank=True, db_index=True)
down_votes = models.IntegerField(default=0, blank=True, db_index=True)
...
class Vote(models.Model):
UP, DOWN = range(2)
TYPE_CHOICES = [(UP, "Upvote"), (DOWN, "DownVote")]
voter = models.ForeignKey(User)
link = models.ForeignKey(Link, related_name='votes')
vote_type = models.IntegerField(choices=TYPE_CHOICES, db_index=True, null=True)
vote_date = models.DateTimeField(db_index=True, auto_now=True)
and the view handles voting: (it's still so simple and stupid I guess)
class VoteFormView(FormView):
form_class = VoteForm
def form_valid(self, form):
link = get_object_or_404(Link, pk=form.data["link"])
user = self.request.user
prev_votes = Vote.objects.filter(voter=user, link=link)
has_voted = (prev_votes.count()>0)
if not has_voted:
Vote.objects.get_or_create(voter=user, link=link)
Link.objects.filter(pk=form.data["link"]).update(up_votes=F('up_votes')+1)
print("+voted")
else:
pass
return redirect("home")
The idea here was to check if the current user has voted for the link, if she didn't so, then increment the up_votes field of corresponding link object. But now it only increments the last link.object.up_votes.

Answer 1

As you may see in comments, the problem caused by wrong pk sent to the views, and it was my mistake to close tag in my template. Just for the record I paste here that part of template code:
{% for link in object_list %}
<form method="POST" action="{% url 'vote' %}" class="vote_form">
<li>
{% csrf_token %}
<input type="hidden" id="id_link" name="link" class="hidden_id" value="{{ link.pk }}"/>
<input type="hidden" id="id_link" name="voter" class="hidden_id" value="{{ user.pk }}"/>
<button>+</button>
[{{ link.up_votes }}]
<a href="{{ link.url }}">
<h3>{{ link.title }}</h3>
</a>
<a href="{% url 'link_detail' pk=link.id slug=link.title|slugify %}">
Comments
</a>
<p>
Submitted by: {{ link.submitter }}
</p>
</li>
</form>
{% endfor %}