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from __future__ import absolute_import, unicode_literals
import os
from django.core.management import call_command
from django.test import TestCase, TransactionTestCase
from django.test.utils import extend_sys_path
from django.utils._os import upath
from .models import (
ConcreteModel, ConcreteModelSubclass, ConcreteModelSubclassProxy,
ProxyModel,
)
class ProxyModelInheritanceTests(TransactionTestCase):
"""
Proxy model inheritance across apps can result in migrate not creating the table
for the proxied model (as described in #12286). This test creates two dummy
apps and calls migrate, then verifies that the table has been created.
"""
available_apps = []
def test_table_exists(self):
with extend_sys_path(os.path.dirname(os.path.abspath(upath(__file__)))):
with self.modify_settings(INSTALLED_APPS={'append': ['app1', 'app2']}):
call_command('migrate', verbosity=0, run_syncdb=True)
from app1.models import ProxyModel
from app2.models import NiceModel
self.assertEqual(NiceModel.objects.all().count(), 0)
self.assertEqual(ProxyModel.objects.all().count(), 0)
class MultiTableInheritanceProxyTest(TestCase):
def test_model_subclass_proxy(self):
"""
Deleting an instance of a model proxying a multi-table inherited
subclass should cascade delete down the whole inheritance chain (see
#18083).
"""
instance = ConcreteModelSubclassProxy.objects.create()
instance.delete()
self.assertEqual(0, ConcreteModelSubclassProxy.objects.count())
self.assertEqual(0, ConcreteModelSubclass.objects.count())
self.assertEqual(0, ConcreteModel.objects.count())
def test_deletion_through_intermediate_proxy(self):
child = ConcreteModelSubclass.objects.create()
proxy = ProxyModel.objects.get(pk=child.pk)
proxy.delete()
self.assertFalse(ConcreteModel.objects.exists())
self.assertFalse(ConcreteModelSubclass.objects.exists())
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