Fixed #12004 -- Improved error reporting when an abstract class is registered...

        they'll be applied as options to the admin class.

        If a model is already registered, this will raise AlreadyRegistered.

        If a model is abstract, this will raise ImproperlyConfigured.

        """

        if not admin_class:

            admin_class = ModelAdmin

        if isinstance(model_or_iterable, ModelBase):

            model_or_iterable = [model_or_iterable]

        for model in model_or_iterable:

            if model._meta.abstract:

                raise ImproperlyConfigured('The model %s is abstract, so it '

                      'cannot be registered with admin.' % model.__name__)

            if model in self._registry:

                raise AlreadyRegistered('The model %s is already registered' % model.__name__)

class Person(models.Model):

    name = models.CharField(max_length=200)

class Place(models.Model):

class Location(models.Model):

    class Meta:

        abstract = True

class Place(Location):

    name = models.CharField(max_length=200)

from django.test import TestCase

from django.core.exceptions import ImproperlyConfigured

from django.contrib import admin

from models import Person, Place

from models import Person, Place, Location

class NameAdmin(admin.ModelAdmin):

    list_display = ['name']

            isinstance(self.site._registry[Place], admin.options.ModelAdmin)

        )

        self.assertEqual(self.site._registry[Place].search_fields, ['name'])

    def test_abstract_model(self):

        """

        Exception is raised when trying to register an abstract model.

        Refs #12004.

        """

        self.assertRaises(ImproperlyConfigured, self.site.register, Location)