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import datetime
import os
import pickle
import subprocess
import sys
import warnings
from django.core.files.temp import NamedTemporaryFile
from django.db import DJANGO_VERSION_PICKLE_KEY, models
from django.test import TestCase, mock
from django.utils._os import npath, upath
from django.utils.encoding import force_text
from django.utils.version import get_version
from .models import Article
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")
with warnings.catch_warnings(record=True) as recorded:
pickle.loads(pickle.dumps(p))
msg = force_text(recorded.pop().message)
self.assertEqual(msg,
"Pickled model instance's Django version is not specified.")
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")
with warnings.catch_warnings(record=True) as recorded:
pickle.loads(pickle.dumps(p))
msg = force_text(recorded.pop().message)
self.assertEqual(
msg,
"Pickled model instance's Django version 1.0 does not "
"match the current version %s." % get_version()
)
def test_unpickling_when_appregistrynotready(self):
"""
#24007 -- Verifies that a pickled model can be unpickled without having
to manually setup the apps registry beforehand.
"""
script_template = """#!/usr/bin/env python
import pickle
from django.conf import settings
data = %r
settings.configure(DEBUG=False, INSTALLED_APPS=['model_regress'], SECRET_KEY = "blah")
article = pickle.loads(data)
print(article.headline)"""
a = Article.objects.create(
headline="Some object",
pub_date=datetime.datetime.now(),
article_text="This is an article",
)
with NamedTemporaryFile(mode='w+', suffix=".py") as script:
script.write(script_template % pickle.dumps(a))
script.flush()
# A path to model_regress must be set in PYTHONPATH
model_regress_dir = os.path.dirname(upath(__file__))
model_regress_path = os.path.abspath(model_regress_dir)
tests_path = os.path.split(model_regress_path)[0]
pythonpath = os.environ.get('PYTHONPATH', '')
pythonpath = npath(os.pathsep.join([tests_path, pythonpath]))
with mock.patch.dict('os.environ', {'PYTHONPATH': pythonpath}):
try:
result = subprocess.check_output([sys.executable, script.name])
except subprocess.CalledProcessError:
self.fail("Unable to reload model pickled data")
self.assertEqual(result.strip().decode(), "Some object")
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