docs: function (cls, type, alias, joinTable, joinAlias, on) {
      let method;
      switch (type) {
          case 'left':
              method = 'leftJoin';
              break;
          case 'right':
              method = 'leftJoin';
              break;
          default:
              method = 'innerJoin';
              break;
      }
      parseOn(cls, alias, method, joinTable, joinAlias, on);
  }