From 32356827b42cba5adfd197e8bc2cdba440e02a05 Mon Sep 17 00:00:00 2001
From: Jason Pellerin <jpellerin@gmail.com>
Date: Wed, 19 Jul 2006 14:57:42 +0000
Subject: [PATCH] [multi-db] Added weakref to model in Options (self._model)
 and method Options.get_default_manager().

git-svn-id: http://code.djangoproject.com/svn/django/branches/multiple-db-support@3379 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/db/models/options.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/django/db/models/options.py b/django/db/models/options.py
index a79b48371c..0e8799db57 100644
--- a/django/db/models/options.py
+++ b/django/db/models/options.py
@@ -8,6 +8,7 @@ from django.db.models.query import orderlist2sql
 from django.db.models import Manager
 from bisect import bisect
 import re
+import weakref
 
 # Calculate the verbose_name by converting from InitialCaps to "lowercase with spaces".
 get_verbose_name = lambda class_name: re.sub('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))', ' \\1', class_name).lower().strip()
@@ -75,6 +76,9 @@ class Options(object):
         if not self.db_table:
             self.db_table = "%s_%s" % (self.app_label, self.module_name)
 
+        # Keep a weakref to my model, for access to managers and such
+        self._model = weakref.ref(model)
+
     def add_field(self, field):
         # Insert the given field in the order in which it was created, using
         # the "creation_counter" attribute of the field.
@@ -100,6 +104,12 @@ class Options(object):
                 return f
         raise FieldDoesNotExist, '%s has no field named %r' % (self.object_name, name)
 
+    def get_default_manager(self):
+        model = self._model()
+        if model is None:
+            raise ReferenceError("Model no longer available in %s" % self)
+        return model._default_manager
+
     def get_order_sql(self, table_prefix=''):
         "Returns the full 'ORDER BY' clause for this object, according to self.ordering."
         if not self.ordering: return ''