code: def get_content_models(self):
          
          models = []
  
          for model in self.concrete_model.get_content_models():
              try:
                  admin_url(model, "add")
              except NoReverseMatch:
                  continue
              else:
                  setattr(model, "meta_verbose_name", model._meta.verbose_name)
                  setattr(model, "add_url", admin_url(model, "add"))
                  models.append(model)
  
          return models
docs: Return all subclasses that are admin registered.