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