You don't have to write all the filter statements at once, you can add
them incrementally. I usually do this kind of thing like:
var1 = request.GET.get('var1', None)
var2 = request.GET.get('var2', None)
var3 = request.GET.get('var3', None)
object_list = MyModel.objects.all()
if var1:
object_list = object_list.filter(var1=var1)
if var2:
object_list = object_list.filter(var2=var2)
if var3:
object_list = object_list.filter(var3=var3)
But I'm usually not dealing with 12 variables (and I often do more than
filter in each if block), so you might want to go with something more
clever if that's too much typing for your case. Just off the top of my
head (untested!):
object_list = MyModel.objects.all()
for key, value in request.GET.items():
if value:
object_list = object_list.filter(**{key: value})
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