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import pickle
from django.db import DJANGO_VERSION_PICKLE_KEY, models
from django.test import TestCase
from django.utils.version import get_version
class ModelPickleTestCase(TestCase):
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(MissingDjangoVersion, self).__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(DifferentDjangoVersion, self).__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." % get_version()
with self.assertRaisesMessage(RuntimeWarning, msg):
pickle.loads(pickle.dumps(p))
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