> Oleg Lomaka <...@gmail.com> :
>
>> Hm... Again I think I have answered this question already.
>> Book.objects.annotate(s_count=Count('sequences')).filter(s_count=0)
>
> Right, but if you're trying to get book by id, this is not an option.
> Again, you will need to query db twice.
>
Besides, separate treating of books with and without sequences isn't
a good design decision, I believe.
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