added an attribute called is_valid to request model just in case we need it in future.
--- a/taskapp/models.py Fri Feb 26 13:22:13 2010 +0530
+++ b/taskapp/models.py Fri Feb 26 14:35:32 2010 +0530
@@ -139,6 +139,7 @@
reply = models.BooleanField(default = False)
remarks = models.TextField(default = "",blank = True)
is_read = models.BooleanField(default = False)
+ is_valid = models.BooleanField(default = True)
creation_date = models.DateTimeField()
reply_date = models.DateTimeField()
is_replied = models.BooleanField(default = False)