django model query add annotation field to show duplicate count

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02 Oct 2018

1from django.db.models import OuterRef, Subquery, Count, Min
2
3subquery = Product.objects.filter(bc_sku=OuterRef('bc_sku')).values('bc_sku')
4                          .annotate(dup_count=Count('*'), min_price=Min('product_price'))
5Product.objects.filter(product_type='good')
6               .annotate(dup_count=Subquery(subquery.values('dup_count')), 
7                         min_price=Subquery(subquery.values('min_price')))

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