--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/regressiontests/cache/models.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,11 @@
+from django.db import models
+from datetime import datetime
+
+def expensive_calculation():
+    expensive_calculation.num_runs += 1
+    return datetime.now()
+
+class Poll(models.Model):
+    question = models.CharField(max_length=200)
+    answer = models.CharField(max_length=200)
+    pub_date = models.DateTimeField('date published', default=expensive_calculation)