'yam,
I have not seen this error, but my responses to the error are inline.
On Jan 6, 2010, at 6:30 AM, Subramanyam wrote:
File "/home/bvemu/lib/python2.6/site-packages/django/core/cache/
backends/memcached.py", line 37, in set
self._cache.set(smart_str(key), value, timeout or
self.default_timeout)
So it appears your issue originates when you call cache.set
(key,user_list)
File "/home/bvemu/lib/python2.6/site-packages/python_memcached-1.45-
py2.6.egg/memcache.py", line 515, in set
return self._set("set", key, val, time, min_compress_len)
File "/home/bvemu/lib/python2.6/site-packages/python_memcached-1.45-
py2.6.egg/memcache.py", line 725, in _set
store_info = self._val_to_store_info(val, min_compress_len)
File "/home/bvemu/lib/python2.6/site-packages/python_memcached-1.45-
py2.6.egg/memcache.py", line 697, in _val_to_store_info
pickler.dump(val)
PicklingError: Can't pickle <class
'django.utils.functional.__proxy__'>: attribute lookup
django.utils.functional.__proxy__ failed
But from these last three lines you can deduce that "Can't pickle" is
telling you the object is not unserializable (only in the failing
case). So, when we reflect back on the point at which you populated
the val you passed to the cache backend you will probably find:
user_list=User.objects.all()[0:10]
produces a list of objects that are serializable (ie, your superuser
account)
and
user_list=User.objects.filter(is_staff=False)[0:10]
is returning an unserializable value possibly? (although pickle.dump
([], some_object) succeeds, serializing an empty list)
I would have to say it seems like you are passing unexpected data to
the cacher that is not being validated as serializable and the pickler
is failing to serialize the invalid data. But this is, just a guess...
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