def on_patch(self, req, resp, session_id):
        # PATCH /v1/sessions/{session_id}     updates the specified session
        user_id = req.get_header('X-User-ID') or ''
        doc = self.json_body(req)
        new_version = self.db.update_session(user_id=user_id,
                                             session_id=session_id,
                                             patch_doc=doc)
        resp.body = {'session_id': session_id, 'version': new_version}
dataset/ETHPy150Open openstack/freezer-api/freezer_api/api/v1/sessions.py/SessionsResource.on_patch/original