code: def update_jsonb(uid, extinfo):
          '''
          Update the json.
          '''
          cur_extinfo = MPost.get_by_uid(uid).extinfo
          for key in extinfo:
              cur_extinfo[key] = extinfo[key]
          entry = TabPost.update(
              extinfo=cur_extinfo,
          ).where(TabPost.uid == uid)
          entry.execute()
          return uif update_jsonb(uid, extinfo):
          '''
          Update the json.
          '''
          cur_extinfo = MPost.get_by_uid(uid).extinfo
          for key in extinfo:
              cur_extinfo[key] = extinfo[key]
          entry = TabPost.update(
              extinfo=cur_extinfo,
          ).where(TabPost.uid == uid)
          entry.execute()
          return uid
docs: Update the json.