Django caching seems to be causing problems
- by Issy
Hey guys, i have just implemented the Django Cache Local Memory back end in some my code, however it seems to be causing a problem.
I get the following error when trying to view the site (With Debug On):
Traceback (most recent call last):
File "/usr/lib/python2.6/dist-packages/django/core/servers/basehttp.py", line 279, in run
self.result = application(self.environ, self.start_response)
File "/usr/lib/python2.6/dist-packages/django/core/servers/basehttp.py", line 651, in __call__
return self.application(environ, start_response)
File "/usr/lib/python2.6/dist-packages/django/core/handlers/wsgi.py", line 245, in __call__
response = middleware_method(request, response)
File "/usr/lib/python2.6/dist-packages/django/middleware/cache.py", line 91, in process_response
patch_response_headers(response, timeout)
File "/usr/lib/python2.6/dist-packages/django/utils/cache.py", line 112, in patch_response_headers
response['Expires'] = http_date(time.time() + cache_timeout)
TypeError: unsupported operand type(s) for +: 'float' and 'str'
I have checked my code, for caching everything seems to be ok. For example, i have the following in my middleware.
MIDDLEWARE_CLASSES = (
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.middleware.cache.UpdateCacheMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.cache.FetchFromCacheMiddleware',
'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware',
)
My settings for Cache:
CACHE_BACKEND = 'locmem://'
CACHE_MIDDLEWARE_SECONDS = '3600'
CACHE_MIDDLEWARE_KEY_PREFIX = 'za'
CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True
And some of my code (template tag):
def get_featured_images():
"""
provides featured images
"""
cache_key = 'featured_images'
images = cache.get(cache_key)
if images is None:
images = FeaturedImage.objects.all().filter(enabled=True)[:5]
cache.set(cache_key, images)
return {'images': images}
Any idea what could be the problem, from the error message below it looks like there's an issue in django's cache.py?
