I want to save the votes of an user of each post (prevent 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 (however duplicate vote is not possible because it goes to the else clause and doesn't show the vote triangle).

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.