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108b8bf852
This prevents AppRegistryNotReady errors when unpickling Django models from an external script.
89 lines
3.2 KiB
Python
89 lines
3.2 KiB
Python
import datetime
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import pickle
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import subprocess
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import tempfile
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import warnings
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from django.db import models, DJANGO_VERSION_PICKLE_KEY
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from django.test import TestCase
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from django.utils.encoding import force_text
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from django.utils.version import get_major_version, get_version
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from .models import Article
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class ModelPickleTestCase(TestCase):
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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(MissingDjangoVersion, self).__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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with warnings.catch_warnings(record=True) as recorded:
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pickle.loads(pickle.dumps(p))
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msg = force_text(recorded.pop().message)
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self.assertEqual(msg,
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"Pickled model instance's Django version is not specified.")
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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(DifferentDjangoVersion, self).__reduce__()
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data = reduce_list[-1]
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data[DJANGO_VERSION_PICKLE_KEY] = str(float(get_major_version()) - 0.1)
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return reduce_list
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p = DifferentDjangoVersion(title="FooBar")
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with warnings.catch_warnings(record=True) as recorded:
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pickle.loads(pickle.dumps(p))
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msg = force_text(recorded.pop().message)
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self.assertEqual(msg,
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"Pickled model instance's Django version %s does not "
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"match the current version %s."
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% (str(float(get_major_version()) - 0.1), get_version()))
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def test_unpickling_when_appregistrynotready(self):
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"""
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#24007 -- Verifies that a pickled model can be unpickled without having
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to manually setup the apps registry beforehand.
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"""
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script_template = """#!/usr/bin/env python
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import pickle
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from django.conf import settings
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data = %r
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settings.configure(DEBUG=False, INSTALLED_APPS=('model_regress',), SECRET_KEY = "blah")
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article = pickle.loads(data)
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print(article.headline)"""
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a = Article.objects.create(
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headline="Some object",
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pub_date=datetime.datetime.now(),
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article_text="This is an article",
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)
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with tempfile.NamedTemporaryFile(mode='w+', suffix=".py", dir='.', delete=True) as script:
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script.write(script_template % pickle.dumps(a))
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script.flush()
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try:
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result = subprocess.check_output(['python', script.name])
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except subprocess.CalledProcessError:
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self.fail("Unable to reload model pickled data")
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self.assertEqual(result.strip().decode(), "Some object")
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