Switch branches/tags
Nothing to show
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


= Overview =

django-view-cache-utils is a django app that provides a method to do advanced 
view caching. It's basically a patch 
from http://code.djangoproject.com/ticket/11269 converted to stand-alone 
python package.

= Installation =

$ easy_install django-view-cache-utils
$ pip install django-view-cache-utils
$ hg clone http://bitbucket.org/kmike/django-view-cache-utils/ 
$ cd django-view-cache-utils
$ python setup.py install

Adding 'view_cache_utils' to INSTALLED_APPS is not necessery, it's a simple 
python package - just import it when needed.

= Usage =

This package provides ``cache_page_with_prefix`` decorator.
It tries to get the page from the cache and
populate the cache if the page isn't in the cache yet.
Works similar to standard Django cache_page decorator, but accept
2 parameters: timeout and callable key_prefix. It makes it easier to fine-tune 
view caching (implement per-user cache, or cache based on GET parameters, 
or cache based on user cookies - cache based on anything in request).

Example 1::

    # 2 static versions of the my_view response: for authenticated and anonymous users
    from view_cache_utils import cache_page_with_prefix
    def my_key_prefix(request):
        if request.GET:
            return None #magic value to disable caching
        if request.user.is_authenticated():
            return 'logged_in'
            return 'not_logged_in'
    @cache_page_with_prefix(600, my_key_prefix)
    def my_view(request):
    ....... #something is different for authenticated and anonymous users
Example 2::
    #cache my_paginated_view based on "page" parameter in query string
    def page_key_prefix(request):
        return request.GET.get('page','')

    @cache_page_with_prefix(60, page_key_prefix)
    def my_paginated_view(request)
    .... #page number is passed via 'page' GET parameter and used for pagination
= Notes =

CACHE_MIDDLEWARE_KEY_PREFIX is ignored in cache_page_with_prefix by default. 
It is consistent with existing behaviour of CacheMiddleware. If you need it you 
should prepend your keys with CACHE_MIDDLEWARE_KEY_PREFIX manually.

If you define custom key_prefix function and don't want to cache requests 
with GET parameters (default behaviour for cache_page) you should do it 
manually as in example 1. 

In order to forbid caching key_prefix function should return None value.

If you define key_prefix function that allows several different versions 
of pages with the same URL you may want to disable client-side cache for 
that page using @cache_control(must_revalidate=True) decorator as in example.    

Please note that kwargs in parameters are not supported, use positional 
arguments instead (you can't write 
``cache_page_with_prefix(timeout=60, key_prefix=my_func)``).