Fixed #24940 -- Made model managers hashable

    def __ne__(self, other):

        return not (self == other)

    def __hash__(self):

        return id(self)

class Manager(BaseManager.from_queryset(QuerySet)):

    pass

* Fixed crash when uploading images with MIME types that Pillow doesn't detect,

  such as bitmap, in ``forms.ImageField`` (:ticket:`24948`).

* Fixed a regression when deleting a model through the admin that has a

  ``GenericRelation`` with a ``related_query_name`` (:ticket:`24940`).

class Contact(models.Model):

    name = models.CharField(max_length=50)

    phone_numbers = GenericRelation(PhoneNumber)

    phone_numbers = GenericRelation(PhoneNumber, related_query_name='phone_numbers')

#

from django.contrib.auth.models import User

from django.contrib.contenttypes.admin import GenericTabularInline

from django.contrib.contenttypes.forms import generic_inlineformset_factory

from django.contrib.contenttypes.models import ContentType

from django.core.urlresolvers import reverse

from django.forms.formsets import DEFAULT_MAX_NUM

from django.forms.models import ModelForm

)

from .admin import MediaInline, MediaPermanentInline, site as admin_site

from .models import Category, Episode, EpisodePermanent, Media

from .models import Category, Episode, EpisodePermanent, Media, PhoneNumber

class TestDataMixin(object):

        response = self.client.post(reverse('admin:generic_inline_admin_contact_add'), post_data)

        self.assertEqual(response.status_code, 302)  # redirect somewhere

    def test_delete(self):

        from .models import Contact

        c = Contact.objects.create(name='foo')

        PhoneNumber.objects.create(

            object_id=c.id,

            content_type=ContentType.objects.get_for_model(Contact),

            phone_number="555-555-5555",

        )

        response = self.client.post(reverse('admin:generic_inline_admin_contact_delete', args=[c.pk]))

        self.assertContains(response, 'Are you sure you want to delete')

@override_settings(ROOT_URLCONF="generic_inline_admin.urls")

class NoInlineDeletionTest(SimpleTestCase):