gistfile1.py

#### Old Models

class BasePage(models.Model):
  title = models.CharField(max_length=2048, blank=True)
  class Meta:
    abstract = True


class Page(BasePage):
  pass


class HomePage(Page):
  content = models.CharField(max_length=2048, blank=True)


#### New models

class BasePage(models.Model):
  title = models.CharField(max_length=2048, blank=True)
  class Meta:
    abstract = True


class Page(BasePage):
  pass


class HomePage(BasePage):
  content = models.CharField(max_length=2048, blank=True)