Find object in child class from object in parent class in django

Question

Let\'s say I have a parent class (ThingsThatMigrate) and two children (Coconut and Swallow). Now let\'s say I have a ThingsThatMigrate object. How can I determine if it is

Answer 1

Concrete or abstract inheritance? If concrete:

>>> things = ThingsThatMigrate.objects.all().select_related('coconut', 'swallow')
>>> for thing in things:
...     thing = thing.coconut or thing.swallow or thing
...     print thing

This can be automated using django-model-utils InheritanceManager (then you don't need to worry about select_related or manually listing all possible subclasses). Maintained by another Django core developer.