> A queryset returns a /list/ of model instances. Thus you should queryset
> when you want more then one instance of the model displayed.
well, slightly wrong, let's clarify. While it's true a queryset
represents a list of model instances (it's not EXACTLY that, it's,
more like, a partially set up query that only gets ran when you
actually request the objects), in GenericViews the difference between
setting up a model and a queryset is that setting up model=Post is the
same as setting up queryset=Post.objects.all(). So if you want your
view to act upon ALL Post instances, and you don't care about
ordering, then you can do model=Post and save yourself some typing.
If, however, you want your view to act upon only a SUBSET of objects,
you can use queryset. If, for example, you are making a list of books
made by a specific author, you can do this:
url(r'^books/shakespeare/$',
ListView.as_view(queryset=Book.objects.filter(author='shakespeare')),...
(of course, this isn't the best example, since it'd be much smarter to
make a more specific view that filters authors by a parameter,
something like (r'books/(P<author_slug>\w+)/$')), but it serves as
example)
In the docs' example, the queryset= parameter is used, because they
want the view to show only the latest 5 Polls, hence the
queryset=Poll.objects.order_by('-pub_date')[:5]. If you wanted ALL,
but ordered by -pub_date (and this wasn't the default ordering for the
model), you would use the same queryset, but leaving out the [:5]
part.
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