Filtering only on Annotations in Django

Question

Taking the example from: http://docs.djangoproject.com/en/dev/topics/db/aggregation/#filter-and-exclude

Publisher.objects.filter(book__rating__gt=3.0).annota         


        

Answer 1

Hm, I think you have to use an extra clause:

Publisher.objects.extra(select={
    'num_books': 'SELECT COUNT(*) ' + \
                 'FROM _book ' + \
                 'WHERE _book.publisher_id = ' + \
                       '_publisher.id AND ' + \
                       'rating > 3.0'
})