Moved ModelAdmin.check_dependancies to AdminSite. Make debugging problems why...

from django.contrib.contenttypes.models import ContentType

from django.contrib.admin import widgets

from django.contrib.admin.util import quote, unquote, get_deleted_objects

from django.core.exceptions import ImproperlyConfigured, PermissionDenied

from django.core.exceptions import PermissionDenied

from django.db import models, transaction

from django.http import Http404, HttpResponse, HttpResponseRedirect

from django.shortcuts import get_object_or_404, render_to_response

        super(ModelAdmin, self).__init__()

    def __call__(self, request, url):

        from django.conf import settings

        if settings.DEBUG:

            self.check_dependancies()

        # Delegate to the appropriate method, based on the URL.

        if url is None:

            return self.changelist_view(request)

        else:

            return self.change_view(request, unquote(url))

    def check_dependancies(self):

        """

        Check that all things needed to run the admin have been correctly installed.

        The default implementation checks that LogEntry, ContentType and the

        auth context processor are installed.

        """

        from django.conf import settings

        from django.contrib.admin.models import LogEntry

        if not LogEntry._meta.installed:

            raise ImproperlyConfigured("Put 'django.contrib.admin' in your INSTALLED_APPS setting in order to use the admin application.")

        if not ContentType._meta.installed:

            raise ImproperlyConfigured("Put 'django.contrib.contenttypes' in your INSTALLED_APPS setting in order to use the admin application.")

        if 'django.core.context_processors.auth' not in settings.TEMPLATE_CONTEXT_PROCESSORS:

            raise ImproperlyConfigured("Put 'django.core.context_processors.auth' in your TEMPLATE_CONTEXT_PROCESSORS setting in order to use the admin application.")

    def _media(self):

        from django.conf import settings

from django.contrib.admin import ModelAdmin

from django.contrib.auth import authenticate, login

from django.db.models.base import ModelBase

from django.core.exceptions import ImproperlyConfigured

from django.shortcuts import render_to_response

from django.utils.safestring import mark_safe

from django.utils.text import capfirst

        """

        return request.user.is_authenticated() and request.user.is_staff

    def check_dependancies(self):

        """

        Check that all things needed to run the admin have been correctly installed.

        The default implementation checks that LogEntry, ContentType and the

        auth context processor are installed.

        """

        from django.conf import settings

        from django.contrib.admin.models import LogEntry

        if not LogEntry._meta.installed:

            raise ImproperlyConfigured("Put 'django.contrib.admin' in your INSTALLED_APPS setting in order to use the admin application.")

        if not ContentType._meta.installed:

            raise ImproperlyConfigured("Put 'django.contrib.contenttypes' in your INSTALLED_APPS setting in order to use the admin application.")

        if 'django.core.context_processors.auth' not in settings.TEMPLATE_CONTEXT_PROCESSORS:

            raise ImproperlyConfigured("Put 'django.core.context_processors.auth' in your TEMPLATE_CONTEXT_PROCESSORS setting in order to use the admin application.")

    def root(self, request, url):

        """

        Handles main URL routing for the admin app.

        if request.method == 'GET' and not request.path.endswith('/'):

            return http.HttpResponseRedirect(request.path + '/')

        if settings.DEBUG:

            self.check_dependancies()

        # Figure out the admin base URL path and stash it for later use

        self.root_path = re.sub(re.escape(url) + '$', '', request.path)