为 foreach() 提供的参数无效 Facade\Ignition\Exceptions\ViewException

Invalid argument supplied for foreach() Facade\Ignition\Exceptions\ViewException

代码在没有 @foreach 语句的情况下运行良好。添加后出现以下错误:

Undefined variable: articles (View: C:\laravel\laravel\resources\views\about.blade.php)
$articles is undefined.
Make the variable optional in the blade template. Replace {{ $articles }} with {{ $articles ?? '' }}

当我添加 ?? '' 时,它会产生错误:

Facade\Ignition\Exceptions\ViewException
Invalid argument supplied for foreach()

下面是更大胆的完整代码: https://github.com/matthoek/Articles

这是我的观点:

        <? if (is_array($articles) || is_object($articles)) ?>
            {
                @foreach ($articles ?? '' as $article)
                {
                    <li class = "first">
                        <h3>{{ $article->title}}</h3>
                        <p><a href="#">{{ $article->excerpt }}</a></p>          
                    </li>
                @endforeach
                }           
            }
        </ul>

这是我的控制器

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use App\Article;

class ArticlesController extends Controller
{
    public function index()
    {
        $articles = App/Article::latest()->get();
        //$articles = Review::all();
        //$article = Review::all();

        return view('articles.index',['articles'=>$articles]);
        //return view('articles.index', ['articles' => $articles]);
    }

    public function show($id)
    {
        $article = App/Article::find($id);

        //return view('articles.show', ['article' => $article]);
        return view('articles.show')->with('article');
    }

    public function create()
    {
        return view('articles.create');
    }

    public function store()
    {
        //validation

        //clean up
        $article = new Article();
        $article->title = request('title');
        $article->excerpt = request('excerpt');
        $article->body = request('body');
        $article->save();

        return redirect('/articles');
    }

    public function edit()
    {
        return view('articles.edit');
    }
}

这是我的路线文件的一部分web.php

Route::group(['middleware' => ['web']], function () 
{

    Route::get('/about', function () {
        $article = App\Article::latest()->get();
        return view('about', compact('about', 'articles'));
        //return $article;
    });
}

我已将路由文件的部分更改为以下内容,但它似乎不起作用。

 return view('about')->with(['article'=> $article]);

我已确保以下内容在我的 app/Http/Kernel.phpmiddlewareGroups 属性 for web \Illuminate\View\Middleware\ShareErrorsFromSession::class,

我已将 foreach 循环更改为 each 循环,但我在行中遇到了相同的错误:

<h3>{{article->title}}</h3>

让我知道是否需要 post 更多代码。

在你的路线中:

    Route::get('/about', function () {
        $articles = App\Article::latest()->get();
        return view('about', compact('about', 'articles'));
    });

它将return一个集合,你可以循环它:

             <ul>
                @foreach ($articles as $article)
                <li class = "first">
                   <h3>{{ $article->title}}</h3>
                   <p><a href="#">{{ $article->excerpt }}</a></p>          
                </li>
                @endforeach
              </ul>

更新您的观点

 <? if (is_array($articles) || is_object($articles)) ?>
        {
            @foreach($articles as $article)

                <li class = "first">
                    <h3>{{ $article->title}}</h3>
                    <p><a href="#">{{ $article->excerpt }}</a></p>          
                </li>
            @endforeach   
        }
    </ul>

错误出在你的 foreach 循环中:https://www.php.net/manual/en/control-structures.foreach.php