Re: fetching data from intermediate many-to-many table

Oleg Lomaka <...@gmail.com> :

> We don't need the first query for fetching books. All data about book
> available from BookSequence too. And all filters you apply to books, you can
> apply to BookSequence via book__ filter. Again, from my first example, and
> using just one query
> bs =
> BookSequence.objects.filter(book__title__startswith='Hello').select_related()
> for s in bs:
>        print s.sequence.name, s.number_in_sequence, s.book.title

That's right. But if we have a book that doesn't belong to any sequence,
bs will be *empty*.

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