Simplest way to do Ajax in Django?

ajaxifying my django

from django.utils import simplejson

....
def problems_of_delivery(request, delivery_id):
    delivery = get_object_or_404(Delivery, pk=int(delivery_id))
    problem_list =[]
    for problem in delivery.problem_set.all():
        problem_list.append([problem.type.id , problem.comment ])
    res_dict = {"date":datetime.now().strftime("%H:%M")}
    res_dict["problems"]=problem_list

    return  HttpResponse(simplejson.dumps(res_dict), mimetype='application/javascript')
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+ jquery getjson : 
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                $.getJSON("/problems_of_delivery/"+deliveryId+"/",
                          function(data){
                });