Django - Override Default Manager in Admin - InheritanceManager

Question

(This seems to be a common question based on the "Questions that may already have your answer" list, but none of those has helped me.)

I have a several models with multi-table inheritance.

In admin (and later, in the front-end app), I need to have a list of all things in the base class, and also be able to identify which child (or grandchild) class they belong to.

I am trying to use Inheritance Manager for this. No luck so far.

class Entry(models.Model):
    name = models.CharField(max_length=200)
    description = models.TextField(max_length=500)
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    slug = models.SlugField(unique=True)
    objects = InheritanceManager()

    def get_queryset(self, request):
        qs = self.model.objects.get_queryset()
        ordering = self.get_ordering(request)
        if ordering:
            qs = qs.order_by(*ordering)
        return qs

    def __str__ (self):
        return self.name + " entry"


class Person(Entity):
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)

    def __str__ (self):
        return self.name + " Person"

Adding the string "person" and "Entry" is just a test.

Lists of Entities just show Entry , even if is also(actually) a person.

I would like to be able to write into Entry.__str__ something that would show the final subclass. That way I could get a list of entries and see:

Bob (Person)
ABC Co. (Organization)
Great Expectations (Book)

Answer 1

I had the same issue, and found hacks to it one way or another. But it never felt clean. I ended up using django-polymorphic ...

When we store models that inherit from a Project model...

Project.objects.create(topic="Department Party") ArtProject.objects.create(topic="Painting with Tim", artist="T. Turner") ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")

...and want to retrieve all our projects, the subclassed models are returned!

Project.objects.all() [ <Project: id 1, topic "Department Party">, <ArtProject: id 2, topic "Painting with Tim", artist "T. Turner">, <ResearchProject: id 3, topic "Swallow Aerodynamics", supervisor "Dr. Winter"> ]

Using vanilla Django, we get the base class objects, which is rarely what we wanted:

Project.objects.all() [ <Project: id 1, topic "Department Party">, <Project: id 2, topic "Painting with Tim">, <Project: id 3, topic "Swallow Aerodynamics"> ]

Hope that helps!