Ticket #2684: 2684.patch

django/db/models/base.py

@@ -90 +90 @@
 
     def __init__(self, *args, **kwargs):
         dispatcher.send(signal=signals.pre_init, sender=self.__class__, args=args, kwargs=kwargs)
+        self._meta._init()        
         for f in self._meta.fields:
             if isinstance(f.rel, ManyToOneRel):
                 try:

django/db/models/options.py

@@ -74 +74 @@
         if not self.db_table:
             self.db_table = "%s_%s" % (self.app_label, self.module_name)
 
+    def _init(self):
+        "Initialization performed on creation of an object instance."        
+        # Instantiate the caches of related objects
+        self.get_all_related_many_to_many_objects()
+        self.get_all_related_objects()
+        
     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.