我在使用的分类信息的时候需要添加联动属性，结果去添加联动属性的时候，发现只可以添加一级联动和三级联动。

二级联动无法添加了。

在自己的5.6的后台添加的时候，发现是可以的。估计又是5.7版本的bug了。

    于是分析了代码，和大家分享下解决的办法：
首先我们找到我们的模板源码下面的 dede/stepselect_main.php  这个文件，

将这段代码

else if($action==addenum_save)
{
    if(empty($ename) || empty($egroup))
    {
         Showmsg(类别名称或组名称不能为空！,-1);
         exit();
    }
    if($issign == 1 || $topvalue == 0)
    {
        $enames = explode(,, $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne(SELECT * FROM `dede_sys_enum` WHERE egroup=$egroup AND (evalue MOD 500)=0 ORDER BY disorder DESC );
            if(!is_array($arr)) $disorder = $evalue = ($issign==1 ? 1 : 500);
            else $disorder = $evalue = $arrdisorder + ($issign==1 ? 1 : 500);
               
            $dsql->ExecuteNoneQuery(INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                                    VALUES($ename,$evalue,$egroup,$disorder,$issign); );
        }
        WriteEnumsCache($egroup);                                                         
        ShowMsg(成功添加枚举分类！.$dsql->GetError(), $ENV_GOBACK_URL);
        exit();
    } else if ($issign == 2 && $topvalue != 0)
    {
        $minid = $topvalue;
        $maxnum = 500; // 三级子类最多500个
        $enames = explode(,, $ename);
        foreach ($enames as $ename)
        {
            $arr = $dsql->GetOne(SELECT * FROM `dede_sys_enum` WHERE egroup=$egroup AND evalue LIKE $topvalue.%%% ORDER BY evalue DESC );
            if(!is_array($arr))
            {
                $disorder = $minid;
                $evalue = $minid..001;
            }
            else
            {
                $disorder = $minid;
                preg_match(#(0-9{1,}).(0-9{1,})#, $arrevalue, $matchs);
                $addvalue = $matchs2 + 1;
                $addvalue = sprintf(d, $addvalue);
                $evalue = $matchs1...$addvalue;

}
            $sql = INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                                    VALUES($ename,$evalue,$egroup,$disorder,$issign); ;
            // echo $sql;exit;
            $dsql->ExecuteNoneQuery($sql);
        }
        // echo $minid;
        WriteEnumsCache($egroup);
        ShowMsg(成功添加枚举分类！, $ENV_GOBACK_URL);
        exit();
    } else {
        $minid = $topvalue;
        $maxid = $topvalue + 500;
        $enames = explode(,, $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne(SELECT * FROM `dede_sys_enum` WHERE egroup=$egroup AND evalue>$minid AND evalue<$maxid ORDER BY evalue DESC );
            if(!is_array($arr))
            {
                $disorder = $evalue = $minid+1;
            }
            else
            {
                $disorder = $arrdisorder+1;
                $evalue = $arrevalue+1;
            }
            $dsql->ExecuteNoneQuery(INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                          VALUES($ename,$evalue,$egroup,$disorder,$issign); );
        }
        WriteEnumsCache($egroup);
        ShowMsg(成功添加枚举分类！, $ENV_GOBACK_URL);
        exit();
    }
}

 

替换为：

else if($action==addenum_save)
{
   if(empty($ename) || empty($egroup)) {
      Showmsg(类别名称或组名称不能为空！,-1);
      exit();
   }
   if($issign==1 || $topvalue==0)
   {
       $enames = explode(,, $ename);
       foreach($enames as $ename)
       {
        $arr = $dsql->GetOne(Select * From `dede_sys_enum` where egroup=$egroup And (evalue mod 500)=0 order by evalue desc );
    
     if(!is_array($arr)) $disorder = $evalue = ($issign==1 ? 1 : 500);
     else $disorder = $evalue = $arrdisorder + ($issign==1 ? 1 : 500);
    
     $dsql->ExecuteNoneQuery(Insert into `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                                    values($ename,$evalue,$egroup,$disorder,$issign); );
        }
        WriteEnumsCache($egroup);     

 ShowMsg(成功添加枚举分类！.$dsql->GetError(), $ENV_GOBACK_URL);
    exit();
  }
  else
  {
    $minid = $topvalue;
    $maxid = $topvalue + 500;
    $enames = explode(,, $ename);
       foreach($enames as $ename)
       {
     $arr = $dsql->GetOne(Select * From `dede_sys_enum` where egroup=$egroup And evalue>$minid And evalue<$maxid order by evalue desc );
     if(!is_array($arr))
     {
      $disorder = $evalue = $minid+1;
     }
     else
     {
      $disorder = $arrdisorder+1;
      $evalue = $arrevalue+1;
     }
     $dsql->ExecuteNoneQuery(Insert into `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                                  values($ename,$evalue,$egroup,$disorder,$issign); );
        }
        WriteEnumsCache($egroup);
    ShowMsg(成功添加枚举分类！, $ENV_GOBACK_URL);
    exit();
  }
}


然后保存，在系统后台更新系统缓存就可以了的。现在在后台的联动类别管理里面就可以增加二级选择了。