Access dynamic session variable name in template

Hi everyone,

I am trying to keep track of who has voted on a comment by setting session variables like 'commentvote1', 'commentvote2', etc to True. These variable names are dynamically generated based on the id of the comment. How can I access these dynamic variables in my template? I've tried this but it doesn't seem to work:

views.py

def comment_upvote(request, comment_id):
    comment = get_object_or_404(Comment.objects.filter(id__exact=comment_id,approved=True))
    if 'commentvote' + str(comment.id) not in request.session:    
        comment.upvotes = comment.upvotes + 1
        comment.votes = comment.votes + 1
        comment.save()
        request.session['commentvote' + str(comment.id)] = True
    else:
        messages.error(request, 'You have already voted on this comment.')
    return redirect('comments')        

The logic in the view is confirmed to work - It won't let you vote on the same comment twice.

template

{% with 'commentvote'|add:comment.id as voted %}
{% if not request.session.voted %}
<button type="button" class="btn btn-success" aria-label="Vote Up"
onclick="javascript:document.location.href='{% url 'comment_upvote' comment.id %}';">
    <span class="glyphicon glyphicon-arrow-up" aria-hidden="true"></span>
</button>
<button type="button" class="btn btn-danger" aria-label="Vote Down"
onclick="javascript:document.location.href='{% url 'comment_downvote' comment.id %}';">
     <span class="glyphicon glyphicon-arrow-down" aria-hidden="true"></span>
</button>
{% endif %}
{% endwith %}

Any help would be appreciated!

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