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import pickle
import django
from django.db import DJANGO_VERSION_PICKLE_KEY, models
from django.test import SimpleTestCase
class ModelPickleTests(SimpleTestCase):
def test_missing_django_version_unpickling(self):
"""
#21430 -- Verifies a warning is raised for models that are
unpickled without a Django version
"""
class MissingDjangoVersion(models.Model):
title = models.CharField(max_length=10)
def __reduce__(self):
reduce_list = super().__reduce__()
data = reduce_list[-1]
del data[DJANGO_VERSION_PICKLE_KEY]
return reduce_list
p = MissingDjangoVersion(title="FooBar")
msg = "Pickled model instance's Django version is not specified."
with self.assertRaisesMessage(RuntimeWarning, msg):
pickle.loads(pickle.dumps(p))
def test_unsupported_unpickle(self):
"""
#21430 -- Verifies a warning is raised for models that are
unpickled with a different Django version than the current
"""
class DifferentDjangoVersion(models.Model):
title = models.CharField(max_length=10)
def __reduce__(self):
reduce_list = super().__reduce__()
data = reduce_list[-1]
data[DJANGO_VERSION_PICKLE_KEY] = "1.0"
return reduce_list
p = DifferentDjangoVersion(title="FooBar")
msg = (
"Pickled model instance's Django version 1.0 does not match the "
"current version %s." % django.__version__
)
with self.assertRaisesMessage(RuntimeWarning, msg):
pickle.loads(pickle.dumps(p))
def test_with_getstate(self):
"""
A model may override __getstate__() to choose the attributes to pickle.
"""
class PickledModel(models.Model):
def __getstate__(self):
state = super().__getstate__().copy()
del state["dont_pickle"]
return state
m = PickledModel()
m.dont_pickle = 1
dumped = pickle.dumps(m)
self.assertEqual(m.dont_pickle, 1)
reloaded = pickle.loads(dumped)
self.assertFalse(hasattr(reloaded, "dont_pickle"))
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