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

The only way to do this is to explicitly store on the base model what type it is. So have a derived_type (or whatever) field on BaseMedium, and set it on save. Then you can have a get_derived_type method:

def get_derived_type(self):
    if self.derived_type ==  'A':
        return self.a
    elif self.derived_type == 'B':
        return self.b

and so on.