django1.7.1の管理画面でモデルを登録順に連番を振って表示する

admin.py

from collections import OrderedDict
from django.apps import apps
from django.contrib.admin import AdminSite
from django.core.urlresolvers import reverse, NoReverseMatch
from django.template.response import TemplateResponse
from django.utils.text import capfirst
from django.views.decorators.cache import never_cache
import six


class OrderedModelAdminSite(AdminSite):
    def __init__(self, name='admin', app_name='admin'):
        super(OrderedModelAdminSite, self).__init__(name=name, app_name=app_name)
        self._registry = OrderedDict()

    @never_cache
    def index(self, request, extra_context=None):
        """
        Displays the main admin index page, which lists all of the installed
        apps that have been registered in this site.
        """
        app_dict = {}
        user = request.user
        for i, v in enumerate(self._registry.items()):
            model, model_admin = v
            app_label = model._meta.app_label
            has_module_perms = user.has_module_perms(app_label)

            if has_module_perms:
                perms = model_admin.get_model_perms(request)

                # Check whether user has any perm for this module.
                # If so, add the module to the model_list.
                if True in perms.values():
                    info = (app_label, model._meta.model_name)
                    model_dict = {
                        'name': '{:003d}. '.format(i + 1) + str(capfirst(model._meta.verbose_name_plural)),
                        'object_name': model._meta.object_name,
                        'perms': perms,
                    }
                    if perms.get('change', False):
                        try:
                            model_dict['admin_url'] = reverse('admin:%s_%s_changelist' % info, current_app=self.name)
                        except NoReverseMatch:
                            pass
                    if perms.get('add', False):
                        try:
                            model_dict['add_url'] = reverse('admin:%s_%s_add' % info, current_app=self.name)
                        except NoReverseMatch:
                            pass
                    if app_label in app_dict:
                        app_dict[app_label]['models'].append(model_dict)
                    else:
                        app_dict[app_label] = {
                            'name': apps.get_app_config(app_label).verbose_name,
                            'app_label': app_label,
                            'app_url': reverse('admin:app_list', kwargs={'app_label': app_label}, current_app=self.name),
                            'has_module_perms': has_module_perms,
                            'models': [model_dict],
                        }

        # Sort the apps alphabetically.
        app_list = list(six.itervalues(app_dict))
        app_list.sort(key=lambda x: x['name'].lower())

        # Sort the models alphabetically within each app.
        # for app in app_list:
        #     app['models'].sort(key=lambda x: x['name'])

        context = dict(
            self.each_context(),
            title=self.index_title,
            app_list=app_list,
        )
        context.update(extra_context or {})
        return TemplateResponse(request, self.index_template or
                                'admin/index.html', context,
                                current_app=self.name)

admin.site = OrderedModelAdminSite()