'Returns the parameters for creating/updating the
persisted model for this subsection grade.'

def _persisted_model_params(self, student):

    return dict(user_id=student.id, usage_key=self.location, course_version=self.course_version, subtree_edited_timestamp=self.subtree_edited_timestamp, earned_all=self.all_total.earned, possible_all=self.all_total.possible, earned_graded=self.graded_total.earned, possible_graded=self.graded_total.possible, visible_blocks=self._get_visible_blocks, first_attempted=self.all_total.first_attempted)
