Pickle can't store an object in django locmem cache during tests?

Question

Something that\'s puzzling me a bit...

>>> from django.core.cache import get_cache
>>>
>>> cache = get_cache(\'django.core.cache.backe         


        

Answer 1

It happens because django LocMemCache uses cPickle instead of pickle by default. You can see it in LocMemCache class:

try:
    from django.utils.six.moves import cPickle as pickle
except ImportError:
    import pickle

If you will try to do in shell:

from django.utils.six.moves import cPickle as pickle
testobj = TestObj()
pickled = pickle.dumps(testobj, pickle.HIGHEST_PROTOCOL)

It will be the same error.

As possible solution I propose you to pack objects manually in your tests using pickle and after that do cache.set():

a = TestObj()
pickled = pickle.dumps(a, pickle.HIGHEST_PROTOCOL)
cache.set('content', pickled)