I don't know if this helps, or is exactly what your trying to avoid,
but I've done something like this before (based on your example):

if use_sources:
   qSource = Q(source_time__range=(start_date, end_date))
else:
   qSource = Q(id__gt=0)

if use_level:
   qLevel = Q(level__exact=level)
else:
   qLevel = Q(id__gt=0)

results = NodeEvent.objects.filter(qSource & qLevel)

The idea is to build up a query with Q objects - and default to showing
all (id__gt=0)

It's still more complicated then going straight from the request
variables to a query, but it works for me.


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