Fixed #25355 -- Made two tweaks to docs/topics/db/aggregation.txt.

    {'price_per_page': 0.4470664529184653}

    # All the following queries involve traversing the Book<->Publisher

    # many-to-many relationship backward

    # foreign key relationship backwards.

    # Each publisher, each with a count of books as a "num_books" attribute.

    >>> from django.db.models import Count

The same rules apply to the ``aggregate()`` clause. If you wanted to

know the lowest and highest price of any book that is available for sale

in a store, you could use the aggregate::

in any of the stores, you could use the aggregate::

    >>> Store.objects.aggregate(min_price=Min('books__price'), max_price=Max('books__price'))