when I combine two Q objects with | operator it ends up with AND being used in sql query.

[muaddib@…]

Hello. I created two querysets which works fine.

Invoice.objects.annotate(mysum=Sum('payments__payment')).filter(Q(mysum__lte=F('invoice_total')) )
Invoice.objects.annotate(mysum=Sum('payments__payment')).filter(mysum=None)

queryset1 returns objects with mysum less then invoice_total. mysum sums payments for the particular invoice.
queryset2 catches non-numeric objects with 'None' as mysum value. This happens when there no payments for the particular invoice.

Fields used:
invoice_total is a decimal field.
payments__payment is also decimal (in related_set).

Now to combine those two querysets into one i use Q logic.

Invoice.objects.annotate(mysum=Sum('payments__payment')).filter(Q(mysum=None) | Q(mysum__lte=F('invoice_total')) )

Unfortunatly it doesnt work (returned queryset is empty). In sql log i can see that those two conditions above are always being glued with default AND (should be ORed because I use Q | Q, not Q & Q).

Database is a postresql 8.3.

[Russell Keith-Magee]

Duplicate of #15240