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 from django.utils.encoding import force_text from django.utils.version import get_major_version, 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] = str(float(get_major_version()) - 0.1) 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 %s does not " "match the current version %s." % (str(float(get_major_version()) - 0.1), 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() pythonpath = [os.path.dirname(script.name)] + sys.path env = { # Needed to run test outside of tests directory str('PYTHONPATH'): os.pathsep.join(pythonpath), # Needed on Windows because http://bugs.python.org/issue8557 str('PATH'): os.environ['PATH'], str('TMPDIR'): os.environ['TMPDIR'], str('LANG'): os.environ.get('LANG', ''), } if 'SYSTEMROOT' in os.environ: # Windows http://bugs.python.org/issue20614 env[str('SYSTEMROOT')] = os.environ['SYSTEMROOT'] try: result = subprocess.check_output([sys.executable, script.name], env=env) except subprocess.CalledProcessError: self.fail("Unable to reload model pickled data") self.assertEqual(result.strip().decode(), "Some object")