Ticket #5599: onetoone_relation_field_saves_v3.diff

db/models/fields/related.py

@@ -126 +126 @@
     def __get__(self, instance, instance_type=None):
         if instance is None:
             raise AttributeError, "%s must be accessed via instance" % self.related.opts.object_name
+        cache_name = self.related.field.get_cache_name()
+        try:
+            return getattr(instance, cache_name)
+        except AttributeError:
+            params = {'%s__pk' % self.related.field.name: instance._get_pk_val()}
+            rel_obj = self.related.model._default_manager.get(**params)
+            setattr(instance, cache_name, rel_obj)
+            return rel_obj
 
-        params = {'%s__pk' % self.related.field.name: instance._get_pk_val()}
-        rel_obj = self.related.model._default_manager.get(**params)
-        return rel_obj
-
     def __set__(self, instance, value):
         if instance is None:
             raise AttributeError, "%s must be accessed via instance" % self.related.opts.object_name