Django model subclassing: Get the subclass by querying the superclass

Question

The following code is given:

class BaseMedium(models.Model):
    title = models.CharField(max_length=40)
    slug = models.SlugField()

class A(BaseMedium):
         


        

Answer 1

Thanks mr. Roseman for your reply. I developed your idea a bit further. Here is what I came up with:

def related_object(self, default_pointer_name='_ptr'):
        models = [A,B] #models
        object = None

        argument = '%s%s' %(self.__class__.__name__.lower(), default_pointer_name)
        query = { argument : self}

        for model in models:
            try:
                object = model.objects.get(**query)
            except model.DoesNotExist:
                pass
            else:
                return object

        if object == None:
            raise RelatedObjectException
        return object

This is a method used by BaseMedium.