我正在用laravel制作一个讨论论坛应用,我面对这个错误:
尝试获取非对象的属性(查看: C:\ xampp \ htdocs \ fourm \ resources \ views \ discussion \ show.blade.php)at at PhpEngine-> evaluatePath(' C:\ XAMPP \ htdocs中\4米\存储\框架\视图/ a2f2c494b8859e0552bfa22c40ceb4065b2efbe5.php&#39 ;, 数组(' __ env' =>对象(工厂),' app' =>对象(应用程序), '信道' =>对象(收集),'错误' =>对象(ViewErrorBag), ' d' => null,' best_answer' => null))在CompilerEngine.php(第59行)
这是我的控制器代码:
public function show($slug)
{
$discussion = Discussion::where('slug', $slug)->first();
$best_answer = Reply::where('best_answer', 1)->first();
return view('discussion.show')->with('d', $discussion)->with('best_answer', $best_answer);
}
这是我的观看代码:
@extends('layouts.app')
@section('content')
<div class="panel panel-default">
<div class="panel-heading">
<img src="{{ $d->user->avatar }}" alt="" width="40px" height="40px">
<span>{{ $d->user->name }}, <b>( {{ $d->user->points }} )</b></span>
@if($d->is_being_watch_by_user())
<a href="{{ route('discussion.unwatch', ['id' => $d->id ]) }}" class="btn btn-default btn-xs pull-right">unwatch</a>
@else
<a href="{{ route('discussion.watch', ['id' => $d->id ]) }}" class="btn btn-default btn-xs pull-right">watch</a>
@endif
</div>
<div class="panel-body">
<h4 class="text-center">
<b>{{ $d->title }}</b>
</h4>
<hr>
<p class="text-center">
{{ $d->content }}
</p>
<hr>
@if($best_answer)
<div class="text-center" style="padding: 40px;">
<h3 class="text-center">BEST ANSWER</h3>
<div class="panel panel-success">
<div class="panel-heading">
<img src="{{ $best_answer->user->avatar }}" alt="" width="40px" height="40px">
<span>{{ $best_answer->user->name }} <b>( {{ $best_answer->user->points }} )</b></span>
</div>
<div class="panel-body">
{{ $best_answer->content }}
</div>
</div>
</div>
@endif
</div>
<div class="panel-footer">
<span>
{{ $d->replies->count() }} Replies
</span>
<a href="{{ route('channel', ['slug' => $d->channel->slug ]) }}" class="pull-right btn btn-default btn-xs">{{ $d->channel->title }}</a>
</div>
</div>
@foreach($d->replies as $r)
<div class="panel panel-default">
<div class="panel-heading">
<img src="{{ $r->user->avatar }}" alt="" width="40px" height="40px">
<span>{{ $r->user->name }} <b>( {{ $r->user->points }} )</b></span>
@if(!$best_answer)
@if(Auth::id() == $d->user->id)
<a href="{{ route('discussion.best.answer', ['id' => $r->id ]) }}" class="btn btn-xs btn-info pull-right">Mark as best answer</a>
@endif
@endif
</div>
<div class="panel-body">
<p class="text-center">
{{ $r->content }}
</p>
</div>
<div class="panel-footer">
@if($r->is_liked_by_user())
<a href="{{ route('reply.unlike', ['id' => $r->id ]) }}" class="btn btn-danger btn-xs">Unlike <span class="badge">{{ $r->likes->count() }}</span></a>
@else
<a href="{{ route('reply.like', ['id' => $r->id ]) }}" class="btn btn-success btn-xs">Like <span class="badge">{{ $r->likes->count() }}</span></a>
@endif
</div>
</div>
@endforeach
<div class="panel panel-default">
<div class="panel-body">
@if(Auth::check())
<form action="{{ route('discussion.reply', ['id' => $d->id ]) }}" method="post">
{{ csrf_field() }}
<div class="form-group">
<label for="reply">Leave a reply...</label>
<textarea name="reply" id="reply" cols="30" rows="10" class="form-control"></textarea>
</div>
<div class="form-group">
<button class="btn pull-right">Leave a reply</button>
</div>
</form>
@else
<div class="text-center">
<h2>Sign in to leave a reply</h2>
</div>
@endif
</div>
</div>
@endsection
答案 0 :(得分:1)
您收到此错误,因为两个查询都返回null
:
$discussion = Discussion::where('slug', $slug)->first();
$best_answer = Reply::where('best_answer', 1)->first();
因此,您需要使用is_null()
或empty()
手动检查空结果,或者只需:
if (!$discussion) {
abort(404);
}
如果没有找到记录,请使用findOrFail()
抛出异常。
答案 1 :(得分:0)
您正在尝试使用null对象访问属性,这就是您遇到“尝试获取null对象的属性”这一错误的原因。
根据我们在评论中的讨论,您在两个查询中都获得null
值,这就是出错的原因!
尝试添加if..else
条件,如下所示:
if (!$d) {
session()->flash('error', 'Discussion not found.');
return redirect()->back();
} else {
return view('discussion.show')->with('d', $discussion)->with('best_answer', $best_answer);
}
希望这能帮到你!
答案 2 :(得分:0)
确保您没有返回对象并将其作为数组访问。这可能是常见的错误。
答案 3 :(得分:-1)
我通过在出现错误的页面上添加:<?php error_reporting(0);?>
解决了我的问题。 :D