Opened 15 years ago

Last modified 13 years ago

#10865 closed

Unable to pickle Queryset — at Version 2

Reported by: wfagan@… Owned by: nobody
Component: Uncategorized Version: dev
Severity: Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Alex Gaynor)

I am getting an error while trying this code. I am using memcached as my backend. It looks like it isn't able to correctly pickle the queryset. This article makes me think it should be able to pickle them... ​http://docs.djangoproject.com/en/dev/ref/models/querysets/#pickling-querysets

>>> places = Place.objects.all()
>>> cache.set("places", pickle.dumps(places))
>>> c = cache.get("places")
>>> pickle.loads(c)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.6/pickle.py", line 1374, in loads
    return Unpickler(file).load()
  File "/usr/lib/python2.6/pickle.py", line 858, in load
    dispatch[key](self)
  File "/usr/lib/python2.6/pickle.py", line 1090, in load_global
    klass = self.find_class(module, name)
  File "/usr/lib/python2.6/pickle.py", line 1124, in find_class
    __import__(module)
TypeError: __import__() argument 1 must be string without null bytes, not str

Change History (3)

comment:1 by wfagan@…, 15 years ago

The formatting got messed up on my last post. Hopefully this will look better.

>>> places = Place.objects.all()
>>> cache.set("places", pickle.dumps(places))
>>> c = cache.get("places")
>>> pickle.loads(c)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.6/pickle.py", line 1374, in loads
    return Unpickler(file).load()
  File "/usr/lib/python2.6/pickle.py", line 858, in load
    dispatch[key](self)
  File "/usr/lib/python2.6/pickle.py", line 1090, in load_global
    klass = self.find_class(module, name)
  File "/usr/lib/python2.6/pickle.py", line 1124, in find_class
    __import__(module)
TypeError: __import__() argument 1 must be string without null bytes, not str

comment:2 by Alex Gaynor, 15 years ago

Description: modified (diff)

Please use preview. Also can you provide your models so we can reproduce.

by wfagan@…, 15 years ago

Attachment: pickle_test.tar.gz​ added
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