django - How to include "None" in lte/gte comparisons? -

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i've got complex filtering mechanism...

d = copy(request.get) d.setdefault('sort_by', 'created') d.setdefault('sort_dir', 'desc') form = filtershipmentform(d) filter = {     'status': shipmentstatuses.active } exclude = {} if not request.user.is_staff:     filter['user__is_staff'] = false  if request.user.is_authenticated():     exclude['user__blocked_by__blocked'] = request.user  if form.is_valid():     d = form.cleaned_data     if d.get('pickup_city'): filter['pickup_address__city__icontains'] = d['pickup_city']     if d.get('dropoff_city'): filter['dropoff_address__city__icontains'] = d['dropoff_city']     if d.get('pickup_province'): filter['pickup_address__province__exact'] = d['pickup_province']     if d.get('dropoff_province'): filter['dropoff_address__province__exact'] = d['dropoff_province']     if d.get('pickup_country'): filter['pickup_address__country__exact'] = d['pickup_country']     if d.get('dropoff_country'): filter['dropoff_address__country__exact'] = d['dropoff_country']     if d.get('min_price'): filter['target_price__gte'] = d['min_price']     if d.get('max_price'): filter['target_price__lte'] = d['max_price']     if d.get('min_distance'): filter['distance__gte'] = d['min_distance'] * 1000     if d.get('max_distance'): filter['distance__lte'] = d['max_distance'] * 1000     if d.get('available_on'): # <--- relevant bit here ---         filter['pickup_earliest__lte'] = d['available_on'] # want "lte or none"         filter['pickup_latest__gte'] = d['available_on']     if d.get('shipper'): filter['user__username__iexact'] = d['shipper']  order = ife(d['sort_dir'] == 'desc', '-') + d['sort_by']  shipments = shipment.objects.filter(**filter).exclude(**exclude).order_by(order) \     .annotate(num_bids=count('bids'), min_bid=min('bids__amount'), max_bid=max('bids__amount'))

and client tells me wants pickup/drop-off dates 'flexible' option. i've updated db allow dates null purpose, "available pickup on" filter won't work expected. should include null/none dates. there easy fix this?

most database engines don't relational comparisons null values. use <field>__isnull explicitly check if value null in database, you'll need use q objects or conditions together.


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