laravel - post函数无法通过db工作

Question

@extends('layouts.master')
@section('content')
    <!-- Page Header -->
    <header class="masthead" style="background-image: url('{{asset('assets/img/home-bg.jpg')}}')">
      <div class="overlay"></div>
      <div class="container">
        <div class="row">
          <div class="col-lg-8 col-md-10 mx-auto">
            <div class="site-heading">
              <h1>Laravel Blog</h1>
              <span class="subheading">The php framework for web artisans</span>
            </div>
          </div>
        </div>
      </div>
    </header>

    <!-- Main Content -->
    <div class="container">
      <div class="row">
        <div class="col-lg-8 col-md-10 mx-auto">
          @foreach($posts as $post)
          <div class="post-preview">
            <a href="#">
              <h2 class="post-title">
                {{$post->title}}
              </h2>
            </a>
            <p class="post-meta">Posted by
              <a href="#">{{$post->user->name}}</a>
              on {{$post->created_at}}</p>
          </div>
          <hr>
          @endforeach

          <!-- Pager -->
          <div class="clearfix">
            <a class="btn btn-primary float-right" href="#">Older Posts </a>
          </div>
        </div>
      </div>
    </div>
@endsection

控制器代码：

namespace App\Http\Controllers;


use Illuminate\Http\Request;
use App\Post;

class PublicController extends Controller
{
    public function index(){
      $posts= Post::all();
      return view('welcome', compact( 'posts'));
    }
    public function singlePost($id){
      return view('singlePost');
    }
    public function about(){
      return view('about');
    }
    public function contact(){
      return view('contact');
    }
    public function contactPost(){

    }
}

我一直在修改我的代码超过24小时仍然无法弄清楚为什么帖子没有显示在我的主页上。路线还可以，他们正常工作只是在传递帖子时没有显示的信息，任何人都可以帮助