#urls.py
url(r"^add_bid/(?P<bid_pk>\d+)/$", views.add_bid, name="add_bid"),

#views.py
def add_bid(request, bid_pk):
    context = {}
    if request.method == 'POST':
        print 111111
        bid = RetailerBid(pk=bid_pk, retailer=request.retailer)
        bid.save()
        context['bid'] = bid
        return render(request, "appname/retailerbid_list.html", context)

#template
<form action="{% url 'appname:add_bid' bid.pk %}" method = "post">

#Ошибка
Exception Value:
Reverse for 'add_bid' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'butiksadmin/add_bid/(?P<bid_pk>\\d+)/$']