Keep reference to view class for resolve()

[Collin Anderson]

I have some pretty hacky code like this that I'd like to get rid of:

match = resolve(url_split)
for cl in match.func.__closure__:
    if hasattr(cl.cell_contents, 'http_method_names'):
        view_class = cl.cell_contents
        # etc
    if hasattr(cl.cell_contents, 'admin_site'):
        admin = cl.cell_contents
        if not admin.has_change_permission(etc):
            etc

It would be great if we could keep a reference to the original view class in these cases.

[Collin Anderson]

​https://github.com/django/django/pull/3797

[Loic Bistuer]

I agree it'd be nice to enable retrieving the actual class, we already preserve __name__, __doc__, etc. we might as well preserve the class itself.

I was worried that decorators like login_required would wipe these anyway and that it may be too fragile as an API, but apparently it doesn't happen thanks to functools.wraps() preserving __dict__.

[Loic Bistuer <loic.bistuer@…>]

In a420f83e7d2e446ca01ef7c13d30c2ef3e975e5c:

Fixed #24055 -- Keep reference to view class for resolve()