Redirection from index to a post fails while solving prevention duplicate vote

I want to save the votes of an user of each post in order to prevent duplicate vote. The idea is to save the upvotes in 'liked_eintraege'. The user should only be able to vote on the result page, not index page. Hence I added it to the result view.

Currently if you upvote a post, the points go up but the problem ist that it keeps redirecting to this (upvoted) post, no matter on what post I click on the index page. However duplicate vote is not possible because it goes to the else clause and doesn't show the vote triangle. So prevention of duplicate vote works.

views.py

def result(request, id):
    eintrag = get_object_or_404(Eintrag, pk=id)

    ...

    eintraege = Eintrag.objects.all().order_by('-id')       
    if request.user.is_authenticated():
       #here in the next line is the problem:
       liked_eintraege = request.user.liked_eintraege.filter(id__in=[eintrag.id for eintrag in eintraege])
    else:
        liked_eintraege=[] 

    context = {
    'eintrag': eintrag,
    'comments': comments,
    'comment_form':form,
    'liked_eintraege': liked_eintraege
    }

    return render(request, 'gaestebuch/result.html', context)

@login_required
def vote(request):
    eintrag = get_object_or_404(Eintrag, pk=request.POST.get('eintrag'))
    eintrag.points += 1
    eintrag.save()
    user = request.user
    user.liked_eintraege.add(eintrag)
    user.save()
    return HttpResponse()

models.py:

class Eintrag(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL, default=1)
    title = models.CharField(max_length=200)
    points = models.IntegerField(default=1)
    text = models.TextField()
    created_date = models.DateTimeField(default=timezone.now)
    voters = models.ManyToManyField(User, related_name='liked_eintraege')

and in result.html:

            {% if user.is_authenticated and eintrag not in liked_eintraege %}
                <a href="/vote/" id="eintrag-vote-{{ eintrag.id }}" class="vote">▲</a>
                <p id="eintrag-title-{{ eintrag.id }}">{{ eintrag.title }}</p>
            {% else %}
                <p>{{ eintrag.title }}</p>
            {% endif %}

the vote function works, thanks to a previous post I already did.