docs: def get_category_model():
      """
      Return the category model to use.
  
      This function reads the :ref:`FLUENT_BLOGS_CATEGORY_MODEL` setting to find the model.
      """
      app_label, model_name = appsettings.FLUENT_BLOGS_CATEGORY_MODEL.rsplit('.', 1)
      try:
          return apps.get_model(app_label, model_name)
      except Exception as e:  # ImportError/LookupError
          raise ImproperlyConfigured("Failed to import FLUENT_BLOGS_CATEGORY_MODEL '{0}': {1}".format(
              appsettings.FLUENT_BLOGS_CATEGORY_MODEL, str(e)
          ))