def expire_view_cache(path, meta, key_prefix=None):
"""
This function allows you to invalidate any item from the per-view cache.
It probably won't work with things cached using the per-site cache
middleware (because that takes account of the Vary: Cookie header).
This assumes you're using the Sites framework.
Arguments:
* path: The URL of the view to invalidate, like `/blog/posts/1234/`.
* meta: Meta details of the request
* key_prefix: The same as that used for the cache_page()
function/decorator (if any).
"""
from django.conf import settings
from django.core.cache import cache
from django.utils.cache import get_cache_key
from django.core.handlers.wsgi import WSGIRequest
# Create a fake request object
request = WSGIRequest(meta)
request.method = 'GET'
request.path = path
if 'admin' in path:
request.META['QUERY_STRING'] = ''
if settings.USE_I18N:
request.LANGUAGE_CODE = settings.LANGUAGE_CODE
# If this key is in the cache, delete it:
try:
cache_key = get_cache_key(request, key_prefix=key_prefix)
if cache_key:
if cache_key in cache:
cache.delete(cache_key)
return (True, 'Successfully invalidated')
else:
return (False, 'Cache_key does not exist in cache')
else:
raise ValueError('Failed to create cache_key')
except (ValueError, Exception) as e:
return (False, e)
