from __future__ import unicode_literals import os import sys from unittest import TestCase from django.core.apps import app_cache from django.core.apps.cache import AppCache from django.test.utils import override_settings from django.utils._os import upath class EggLoadingTest(TestCase): def setUp(self): self.old_path = sys.path[:] self.egg_dir = '%s/eggs' % os.path.dirname(upath(__file__)) # The models need to be removed after the test in order to prevent bad # interactions with the flush operation in other tests. self._old_models = app_cache.app_configs['app_loading'].models.copy() def tearDown(self): app_cache.app_configs['app_loading'].models = self._old_models app_cache._get_models_cache = {} sys.path = self.old_path def test_egg1(self): """Models module can be loaded from an app in an egg""" egg_name = '%s/modelapp.egg' % self.egg_dir sys.path.append(egg_name) models = app_cache.load_app('app_with_models') self.assertFalse(models is None) def test_egg2(self): """Loading an app from an egg that has no models returns no models (and no error)""" egg_name = '%s/nomodelapp.egg' % self.egg_dir sys.path.append(egg_name) models = app_cache.load_app('app_no_models') self.assertTrue(models is None) def test_egg3(self): """Models module can be loaded from an app located under an egg's top-level package""" egg_name = '%s/omelet.egg' % self.egg_dir sys.path.append(egg_name) models = app_cache.load_app('omelet.app_with_models') self.assertFalse(models is None) def test_egg4(self): """Loading an app with no models from under the top-level egg package generates no error""" egg_name = '%s/omelet.egg' % self.egg_dir sys.path.append(egg_name) models = app_cache.load_app('omelet.app_no_models') self.assertTrue(models is None) def test_egg5(self): """Loading an app from an egg that has an import error in its models module raises that error""" egg_name = '%s/brokenapp.egg' % self.egg_dir sys.path.append(egg_name) self.assertRaises(ImportError, app_cache.load_app, 'broken_app') raised = None try: app_cache.load_app('broken_app') except ImportError as e: raised = e # Make sure the message is indicating the actual # problem in the broken app. self.assertTrue(raised is not None) self.assertTrue("modelz" in raised.args[0]) def test_missing_app(self): """ Test that repeated app loading doesn't succeed in case there is an error. Refs #17667. """ app_cache = AppCache() # Pretend we're the master app cache to test populate(). app_cache.master = True with override_settings(INSTALLED_APPS=('notexists',)): with self.assertRaises(ImportError): app_cache.get_model('notexists', 'nomodel', seed_cache=True) with self.assertRaises(ImportError): app_cache.get_model('notexists', 'nomodel', seed_cache=True) class GetModelsTest(TestCase): def setUp(self): from .not_installed import models self.not_installed_module = models def test_get_model_only_returns_installed_models(self): self.assertEqual( app_cache.get_model("not_installed", "NotInstalledModel"), None) def test_get_model_with_not_installed(self): self.assertEqual( app_cache.get_model( "not_installed", "NotInstalledModel", only_installed=False), self.not_installed_module.NotInstalledModel) def test_get_models_only_returns_installed_models(self): self.assertFalse( "NotInstalledModel" in [m.__name__ for m in app_cache.get_models()]) def test_get_models_with_app_label_only_returns_installed_models(self): self.assertEqual(app_cache.get_models(self.not_installed_module), []) def test_get_models_with_not_installed(self): self.assertTrue( "NotInstalledModel" in [ m.__name__ for m in app_cache.get_models(only_installed=False)]) class NotInstalledModelsTest(TestCase): def test_related_not_installed_model(self): from .not_installed.models import NotInstalledModel self.assertEqual( set(NotInstalledModel._meta.get_all_field_names()), set(["id", "relatedmodel", "m2mrelatedmodel"]))