django/tests/proxy_models/tests.py

from __future__ import unicode_literals
import copy

from django.conf import settings
from django.contrib import admin
from django.contrib.contenttypes.models import ContentType
from django.core import management
from django.core.exceptions import FieldError
from django.db import models, DEFAULT_DB_ALIAS
from django.db.models import signals
from django.db.models.loading import cache
from django.test import TestCase


from .models import (MyPerson, Person, StatusPerson, LowerStatusPerson,
    MyPersonProxy, Abstract, OtherPerson, User, UserProxy, UserProxyProxy,
    Country, State, StateProxy, TrackerUser, BaseUser, Bug, ProxyTrackerUser,
    Improvement, ProxyProxyBug, ProxyBug, ProxyImprovement, Issue)


class ProxyModelTests(TestCase):
    def test_same_manager_queries(self):
        """
        The MyPerson model should be generating the same database queries as
        the Person model (when the same manager is used in each case).
        """
        my_person_sql = MyPerson.other.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        person_sql = Person.objects.order_by("name").query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        self.assertEqual(my_person_sql, person_sql)

    def test_inheretance_new_table(self):
        """
        The StatusPerson models should have its own table (it's using ORM-level
        inheritance).
        """
        sp_sql = StatusPerson.objects.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        p_sql = Person.objects.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        self.assertNotEqual(sp_sql, p_sql)

    def test_basic_proxy(self):
        """
        Creating a Person makes them accessible through the MyPerson proxy.
        """
        person = Person.objects.create(name="Foo McBar")
        self.assertEqual(len(Person.objects.all()), 1)
        self.assertEqual(len(MyPerson.objects.all()), 1)
        self.assertEqual(MyPerson.objects.get(name="Foo McBar").id, person.id)
        self.assertFalse(MyPerson.objects.get(id=person.id).has_special_name())

    def test_no_proxy(self):
        """
        Person is not proxied by StatusPerson subclass.
        """
        Person.objects.create(name="Foo McBar")
        self.assertEqual(list(StatusPerson.objects.all()), [])

    def test_basic_proxy_reverse(self):
        """
        A new MyPerson also shows up as a standard Person.
        """
        MyPerson.objects.create(name="Bazza del Frob")
        self.assertEqual(len(MyPerson.objects.all()), 1)
        self.assertEqual(len(Person.objects.all()), 1)

        LowerStatusPerson.objects.create(status="low", name="homer")
        lsps = [lsp.name for lsp in LowerStatusPerson.objects.all()]
        self.assertEqual(lsps, ["homer"])

    def test_correct_type_proxy_of_proxy(self):
        """
        Correct type when querying a proxy of proxy
        """
        Person.objects.create(name="Foo McBar")
        MyPerson.objects.create(name="Bazza del Frob")
        LowerStatusPerson.objects.create(status="low", name="homer")
        pp = sorted([mpp.name for mpp in MyPersonProxy.objects.all()])
        self.assertEqual(pp, ['Bazza del Frob', 'Foo McBar', 'homer'])

    def test_proxy_included_in_ancestors(self):
        """
        Proxy models are included in the ancestors for a model's DoesNotExist
        and MultipleObjectsReturned
        """
        Person.objects.create(name="Foo McBar")
        MyPerson.objects.create(name="Bazza del Frob")
        LowerStatusPerson.objects.create(status="low", name="homer")
        max_id = Person.objects.aggregate(max_id=models.Max('id'))['max_id']

        self.assertRaises(Person.DoesNotExist,
            MyPersonProxy.objects.get,
            name='Zathras'
        )
        self.assertRaises(Person.MultipleObjectsReturned,
            MyPersonProxy.objects.get,
            id__lt=max_id + 1
        )
        self.assertRaises(Person.DoesNotExist,
            StatusPerson.objects.get,
            name='Zathras'
        )

        sp1 = StatusPerson.objects.create(name='Bazza Jr.')
        sp2 = StatusPerson.objects.create(name='Foo Jr.')
        max_id = Person.objects.aggregate(max_id=models.Max('id'))['max_id']

        self.assertRaises(Person.MultipleObjectsReturned,
            StatusPerson.objects.get,
            id__lt=max_id + 1
        )

    def test_abc(self):
        """
        All base classes must be non-abstract
        """
        def build_abc():
            class NoAbstract(Abstract):
                class Meta:
                    proxy = True
        self.assertRaises(TypeError, build_abc)

    def test_no_cbc(self):
        """
        The proxy must actually have one concrete base class
        """
        def build_no_cbc():
            class TooManyBases(Person, Abstract):
                class Meta:
                    proxy = True
        self.assertRaises(TypeError, build_no_cbc)

    def test_no_base_classes(self):
        def build_no_base_classes():
            class NoBaseClasses(models.Model):
                class Meta:
                    proxy = True
        self.assertRaises(TypeError, build_no_base_classes)

    def test_new_fields(self):
        def build_new_fields():
            class NoNewFields(Person):
                newfield = models.BooleanField()

                class Meta:
                    proxy = True
        self.assertRaises(FieldError, build_new_fields)

    def test_swappable(self):
        try:
            # This test adds dummy applications to the app cache. These
            # need to be removed in order to prevent bad interactions
            # with the flush operation in other tests.
            old_app_models = copy.deepcopy(cache.app_models)
            old_app_store = copy.deepcopy(cache.app_store)

            settings.TEST_SWAPPABLE_MODEL = 'proxy_models.AlternateModel'

            class SwappableModel(models.Model):

                class Meta:
                    swappable = 'TEST_SWAPPABLE_MODEL'

            class AlternateModel(models.Model):
                pass

            # You can't proxy a swapped model
            with self.assertRaises(TypeError):
                class ProxyModel(SwappableModel):

                    class Meta:
                        proxy = True
        finally:
            del settings.TEST_SWAPPABLE_MODEL
            cache.app_models = old_app_models
            cache.app_store = old_app_store

    def test_myperson_manager(self):
        Person.objects.create(name="fred")
        Person.objects.create(name="wilma")
        Person.objects.create(name="barney")

        resp = [p.name for p in MyPerson.objects.all()]
        self.assertEqual(resp, ['barney', 'fred'])

        resp = [p.name for p in MyPerson._default_manager.all()]
        self.assertEqual(resp, ['barney', 'fred'])

    def test_otherperson_manager(self):
        Person.objects.create(name="fred")
        Person.objects.create(name="wilma")
        Person.objects.create(name="barney")

        resp = [p.name for p in OtherPerson.objects.all()]
        self.assertEqual(resp, ['barney', 'wilma'])

        resp = [p.name for p in OtherPerson.excluder.all()]
        self.assertEqual(resp, ['barney', 'fred'])

        resp = [p.name for p in OtherPerson._default_manager.all()]
        self.assertEqual(resp, ['barney', 'wilma'])

    def test_permissions_created(self):
        from django.contrib.auth.models import Permission
        try:
            Permission.objects.get(name="May display users information")
        except Permission.DoesNotExist:
            self.fail("The permission 'May display users information' has not been created")

    def test_proxy_model_signals(self):
        """
        Test save signals for proxy models
        """
        output = []

        def make_handler(model, event):
            def _handler(*args, **kwargs):
                output.append('%s %s save' % (model, event))
            return _handler

        h1 = make_handler('MyPerson', 'pre')
        h2 = make_handler('MyPerson', 'post')
        h3 = make_handler('Person', 'pre')
        h4 = make_handler('Person', 'post')

        signals.pre_save.connect(h1, sender=MyPerson)
        signals.post_save.connect(h2, sender=MyPerson)
        signals.pre_save.connect(h3, sender=Person)
        signals.post_save.connect(h4, sender=Person)

        dino = MyPerson.objects.create(name="dino")
        self.assertEqual(output, [
            'MyPerson pre save',
            'MyPerson post save'
        ])

        output = []

        h5 = make_handler('MyPersonProxy', 'pre')
        h6 = make_handler('MyPersonProxy', 'post')

        signals.pre_save.connect(h5, sender=MyPersonProxy)
        signals.post_save.connect(h6, sender=MyPersonProxy)

        dino = MyPersonProxy.objects.create(name="pebbles")

        self.assertEqual(output, [
            'MyPersonProxy pre save',
            'MyPersonProxy post save'
        ])

        signals.pre_save.disconnect(h1, sender=MyPerson)
        signals.post_save.disconnect(h2, sender=MyPerson)
        signals.pre_save.disconnect(h3, sender=Person)
        signals.post_save.disconnect(h4, sender=Person)
        signals.pre_save.disconnect(h5, sender=MyPersonProxy)
        signals.post_save.disconnect(h6, sender=MyPersonProxy)

    def test_content_type(self):
        ctype = ContentType.objects.get_for_model
        self.assertTrue(ctype(Person) is ctype(OtherPerson))

    def test_user_userproxy_userproxyproxy(self):
        User.objects.create(name='Bruce')

        resp = [u.name for u in User.objects.all()]
        self.assertEqual(resp, ['Bruce'])

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

        resp = [u.name for u in UserProxyProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

    def test_proxy_for_model(self):
        self.assertEqual(UserProxy, UserProxyProxy._meta.proxy_for_model)

    def test_concrete_model(self):
        self.assertEqual(User, UserProxyProxy._meta.concrete_model)

    def test_proxy_delete(self):
        """
        Proxy objects can be deleted
        """
        User.objects.create(name='Bruce')
        u2 = UserProxy.objects.create(name='George')

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce', 'George'])

        u2.delete()

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

    def test_select_related(self):
        """
        We can still use `select_related()` to include related models in our
        querysets.
        """
        country = Country.objects.create(name='Australia')
        state = State.objects.create(name='New South Wales', country=country)

        resp = [s.name for s in State.objects.select_related()]
        self.assertEqual(resp, ['New South Wales'])

        resp = [s.name for s in StateProxy.objects.select_related()]
        self.assertEqual(resp, ['New South Wales'])

        self.assertEqual(StateProxy.objects.get(name='New South Wales').name,
            'New South Wales')

        resp = StateProxy.objects.select_related().get(name='New South Wales')
        self.assertEqual(resp.name, 'New South Wales')

    def test_proxy_bug(self):
        contributor = TrackerUser.objects.create(name='Contributor',
            status='contrib')
        someone = BaseUser.objects.create(name='Someone')
        Bug.objects.create(summary='fix this', version='1.1beta',
            assignee=contributor, reporter=someone)
        pcontributor = ProxyTrackerUser.objects.create(name='OtherContributor',
            status='proxy')
        Improvement.objects.create(summary='improve that', version='1.1beta',
            assignee=contributor, reporter=pcontributor,
            associated_bug=ProxyProxyBug.objects.all()[0])

        # Related field filter on proxy
        resp = ProxyBug.objects.get(version__icontains='beta')
        self.assertEqual(repr(resp), '<ProxyBug: ProxyBug:fix this>')

        # Select related + filter on proxy
        resp = ProxyBug.objects.select_related().get(version__icontains='beta')
        self.assertEqual(repr(resp), '<ProxyBug: ProxyBug:fix this>')

        # Proxy of proxy, select_related + filter
        resp = ProxyProxyBug.objects.select_related().get(
            version__icontains='beta'
        )
        self.assertEqual(repr(resp), '<ProxyProxyBug: ProxyProxyBug:fix this>')

        # Select related + filter on a related proxy field
        resp = ProxyImprovement.objects.select_related().get(
            reporter__name__icontains='butor'
        )
        self.assertEqual(repr(resp),
            '<ProxyImprovement: ProxyImprovement:improve that>'
        )

        # Select related + filter on a related proxy of proxy field
        resp = ProxyImprovement.objects.select_related().get(
            associated_bug__summary__icontains='fix'
        )
        self.assertEqual(repr(resp),
            '<ProxyImprovement: ProxyImprovement:improve that>'
        )

    def test_proxy_load_from_fixture(self):
        management.call_command('loaddata', 'mypeople.json', verbosity=0)
        p = MyPerson.objects.get(pk=100)
        self.assertEqual(p.name, 'Elvis Presley')


class ProxyModelAdminTests(TestCase):
    fixtures = ['myhorses']

    def test_cascade_delete_proxy_model_admin_warning(self):
        """
        Test if admin gives warning about cascade deleting models referenced
        to concrete model by deleting proxy object.
        """
        tracker_user = TrackerUser.objects.all()[0]
        base_user = BaseUser.objects.all()[0]
        issue = Issue.objects.all()[0]
        with self.assertNumQueries(7):
            collector = admin.util.NestedObjects('default')
            collector.collect(ProxyTrackerUser.objects.all())
        self.assertTrue(tracker_user in collector.edges.get(None, ()))
        self.assertTrue(base_user in collector.edges.get(None, ()))
        self.assertTrue(issue in collector.edges.get(tracker_user, ()))