code: def get_icon_for_model(self, app_name, model_name, default=None):
          
          key = "{0}/{1}".format(app_name, model_name)
          return appsettings.FLUENT_DASHBOARD_APP_ICONS.get(key, default)
docs: Return the icon for the given model.
          It reads the :ref:`FLUENT_DASHBOARD_APP_ICONS` setting.