docs: def get_usersettings_model():
      """
      Returns the ``UserSettings`` model that is active in this project.
      """
      try:
          from django.apps import apps
          get_model = apps.get_model
      except ImportError:
          from django.db.models.loading import get_model
  
      try:
          app_label, model_name = settings.USERSETTINGS_MODEL.split('.')
      except ValueError:
          raise ImproperlyConfigured('USERSETTINGS_MODEL must be of the '
                                     'form "app_label.model_name"')
      usersettings_model = get_model(app_label, model_name)
      if usersettings_model is None:
          raise ImproperlyConfigured('USERSETTINGS_MODEL refers to model "%s" that has '
                                     'not been installed' % settings.USERSETTINGS_MODEL)
      return usersettings_model