How do I select the base class from the child object in Django (using model inheritance)

Question

I have a base model and one that inherits from it, similar in setup to this:

class Archive(models.Model):
    pub_date = models.DateField()


class ArchiveB(Archive):
    another_date = models.DateField()

How do I access the base class from the child class? For example:

archiveb_instance = ArchiveB.objects.get(pk=5) 
base_instance = archiveb_instance.archive #This doesn't work.

According to the documentation its just a one-to-one relationship automatically created in the child so I figured it would let me go backwards. The reason I want this is because I have a third non-Archive model that has a foreignkey to Archive. I want the foreignkey to Archive because this way the third model can relate to any Archive, not just a specific Archive type.

Answer 1

i think you might be looking for archiveb_instance.archive_ptr

Answer 2

They share the same PK, so just assign that to the field with _id appended.