I know django does not support STI, but I was wondering if there is
any way I can implement this behaviour.

Here is an example of what I would like:

class Tracker(models.Model):
   notifications = models.ForeignKey(Notification)

class Notification(models.Model):
    # Common fields
    pass

class EmailNotification(Notification):
   pass

class SmsNotification(Notification):
   pass


# I would be able to iterate over all types of notification
for n in tracker.notifications:
   print n
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