On Mar 9, 9:11 am, Håkan W <hwa...@gmail.com> wrote:
> Hi all,
>
> I'm a bit confused about the caching. I've started using per-view
> caching with the @cache_page decorator.
>
> Now, if I add this to pages that return private content to logged-in
> users, will it do the right thing and not show information for one
> logged-in user to another? And it must not show logged-in content to
> non-logged in users of course.
First, add this to your settings:
CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True
Even though this setting is for the cache middleware, the @cache_page
decorator internally uses the same middleware code so the above
setting will be honored by it.
>
> Example:
>
> @cache_page(3 * 60)
> @login_required
> def view(request):
> if request.user.is_authenticated():
> # show something that is "private" to this user...
> else:
> # show general stuff, for all non-logged in users
With CACHE_MIDDLEWARE_ANONYMOUS_ONLY set to True, the @cache_page
decorator will cache the anonymous part of your above view i.e. the
"general stuff" but will not cache the "private" part of the view.
BUT, since your view requires login, @cache_page will cache nothing in
this case or more accurately, the "general stuff" is never going to be
executed because anonymous users will be redirected to the login page
by your @login_required decorator.
You can always use the low-level caching API if you want finder
control over what gets logged in.
> Also, does anyone know of a simple way to tell when stuff is served
> from cache and not, when you're testing on your production server?
Ummmm... don't test on your production server :)
If you use memcached, you can run it in verbose non-daemon mode with "-
vv" (leave out the -d setting so it runs in your terminal in the
foreground). That will show you cache hits when you browse to a
cachable view.
Don't forget to set memcached back to daemon/background mode with the
verbosity turned off after you're done.
-RD
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