“试图获取非对象的属性”错误是什么意思？

Question

  

Blockquote

我正在laravel中开发一个网站，但遇到错误（尝试获取非对象的属性）可以帮助我 我的控制器

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
use app\Http\Requests;
use Session;
use Illuminate\Support\Facades\Redirect;
Session_start();
class HomeController extends Controller
{


    public function index()
    {
        return view('page.home');
    }


    public function blog_details($id)
    {

        $blog_detail=DB::table('blog')
                    ->join('users','blog.author','=','users.id')
                    ->select('blog.*')
                    ->where('blog.id',$id)                                
                    ->first();

        $manage_detail=view('page.blog_details')
                    ->with('blog_detail',$blog_detail);

        return view('layout')
                    ->with('page.blog_details',$manage_detail);
   }


    public function event_detail($id)
    {
        $event_detail=DB::table('events')
                        ->join('users','events.author','=','users.id')
                        ->where('events.id',$id)
                        ->first();

        $manage_details=view('page.event_detail')
                    ->with('event_detail',$event_detail);

        return view('layout')
                    ->with('page.event_detail',$manage_details);
    }
}

下面的代码是我的刀片Blog_details.blade.php

@extends('layout')
@section('home')  

<div class="hero-wrap" style="background-image: url('{{asset($blog_detail->main_photo)}}');" data-stellar-background-ratio="0.5">
  <div class="overlay"></div>
  <div class="container">
    <div class="row no-gutters slider-text align-items-center justify-content-center" data-scrollax-parent="true">
      <div class="col-md-7 ftco-animate text-center" data-scrollax=" properties: { translateY: '70%' }">            
        <h1 class="mb-3 bread" data-scrollax="properties: { translateY: '30%', opacity: 1.6 }">{{($blog_detail->title or 'No last product')}}</h1>
      </div>
    </div>
  </div>
</div>
<section class="ftco-section ftco-degree-bg">
  <div class="container">
    <div class="row">
      <div class="col-md-8 ftco-animate">
        <h2 class="mb-3">{{($blog_detail->short_description)}}</h2>
        {{($blog_detail->content)}}
        <div class="tag-widget post-tag-container mb-5 mt-5">
          <div class="tagcloud">
            <a href="https:/twitter.com/{{($blog_detail->hash_tag)}}" class="tag-cloud-link">{{($blog_detail->hash_tag)}}</a>
          </div>
        </div>

        <div class="about-author d-flex p-5 bg-light">
          <div class="bio align-self-md-center mr-5">
            <img src="{{asset($blog_detail->photo)}}" alt="Image placeholder" class="img-fluid mb-4" style="width: 150px;height: auto;">
          </div>
          <div class="desc align-self-md-center">
            <h3>{{($blog_detail->firstname)}} {{($blog_detail->lastname)}}</h3>
            <p>{{($blog_detailget_blog->quote)}}</p>
          </div>
        </div>
      </div><!-- .col-md-8 -->
      <div class="col-md-4 sidebar ftco-animate">
        <div class="sidebar-box">
          <form action="#" class="search-form">
            <div class="form-group">
              <span class="icon fa fa-search"></span>
              <input type="text" class="form-control" placeholder="Type a keyword and hit enter">
            </div>
          </form>
        </div>
        <div class="sidebar-box ftco-animate">
          <h3>Recent Blog</h3>
          <?php                              
            $all=DB::table('blog')
                            ->join('users','blog.author','=','users.id')
                            ->OrderBy('blog.id','DESC') 
                            ->limit(2,4)                               
                            ->get();
                                  ?>
            @foreach( $all as $all )
          <div class="block-21 mb-4 d-flex">
            <a class="blog-img mr-4" style="background-image: url({{asset($all->main_photo)}});"></a>
            <div class="text">
              <h3 class="heading"><a href="#">{{($all->short_description)}}</a></h3>
              <div class="meta">
                <div><a href="#"><span class="icon-calendar"></span> July 12, 2018</a></div>
                <div><a href="#"><span class="icon-person"></span> {{($all->firstname)}}</a></div>
                <div><a href="#"><span class="icon-chat"></span> 19</a></div>
              </div>
            </div>
          </div>
          @endforeach
        </div>
      </div>

    </div>
  </div>
</section>
@endsection