尝试获取非对象错误的属性,同时尝试使用雄辩关系


Trying to get property of non-object error while trying to use eloquent relationship

错误如下所示:

Trying to get property of non-object (View: C:'xampp'htdocs'laravel'app'views'singlePost.blade.php)

有 2 个表:评论和用户。在注释表中,有一个名为 user_id 的列,它引用用户表中的 id 列。用户表中有用户名列。 这就是我尝试打印用户名的方式。

@foreach($theComments as $theComment)
<div>{{$theComment->users->username}}</div>
<div style="border:1px solid black;margin:8px 0px 8px 0px">{{$theComment['content']}}</div>
@endforeach

和控制器:

 public function singlePost(Posts $post)
    {
        $id = $post['id'];
        $comments = Comments::where('post_id','=',$id)->get();
        $users = Users::all();
        return View::make('singlePost')->with('thePost', $post)->with('theComments', $comments)->with('theUser', $users);
    }

和/模型/注释.php

<?php
class Comments extends Eloquent{
    protected $fillable = array('user_id');
    public function users(){
        return $this->belongsTo('Users');
    }
}

问题是什么,我该如何解决?

首先,

我建议您将关系重命名为仅user()(一开始以为它会返回一个集合)。错误的源可能是未分配用户的注释。

最好的方法是从查询中排除这些内容。您可以使用has()

$comments = Comments::has('user')->where('post_id','=',$id)->get();

并且您还应该急于加载用户关系,否则您会遇到 n+1 查询问题:

$comments = Comments::has('user')->with('user')->where('post_id','=',$id)->get();

编辑

尝试将其包装在您的视图中:

@foreach($theComments as $theComment)
    @if($user = $theComment->users)
        <div>{{$user->username}}</div>
    @endif
@endforeach

您需要先加载关系

$comments = Comments::with('users')->where('post_id','=',$id)->get();

见 http://laravel.com/docs/4.2/eloquent#eager-loading