Get specific property of a model returns error: Undefined property: Illuminate\Database\Eloquent\Builder::$id

Question

我想检查我的用户 table 中是否存在模型，然后获取它的 ID 属性以插入新记录，但得到 未定义属性 错误。我阅读了文档和一些类似的问题，但它们没有用。有人可以告诉我如何处理吗？

控制器：

$checkExist=Users::where('codeMeli', $codeMeli);

     if (!empty($checkExist))
     {
          $checkOwner=DB::table('user_admin')->whereRaw('userid='.$checkExist->id.' and adminid='.$CurrentUSerID)->get();
          if($checkOwner>0)
          {
               //alert user was added before
          }
          else
          {
               $result= DB::table('user_admin')->insert(['userid'=>$checkExist->id,'adminid'=>$CurrentUSerID]);
          }
      }

错误：

Undefined property: Illuminate\Database\Eloquent\Builder::$id

Answer 1

你应该使用 first 或 get

$checkExist=Users::where('codeMeli', $codeMeli)->first();

Get specific property of a model returns error: Undefined property: Illuminate\Database\Eloquent\Builder::$id

Get specific property of a model returns error: Undefined property: Illuminate\Database\Eloquent\Builder::$id

model

laravel-5.3