类 App\Http\Controllers\PostController 不存在

Question

让我先说“我知道这个问题经常被问到。” 当我说没有任何效果时，请相信我。

我创建了一个名为PostController. 这是我博客的控制器。当我导航到我的博客时，Class App\Http\Controllers\PostController does not exist即使它确实存在，我也会收到以下错误。控制器被称为PostController.php。这是路线的样子Route::get('blog','PostController@index');。我读过运行一些composer命令会有所帮助，但没有一个对我有帮助。composer dumpautoload以及composer update。我在这里错过了一些步骤吗？有人遇到过类似的问题吗？如果需要其他信息，请告诉我。

编辑 这是顶部的命名空间。

use App\Http\Controllers;
use App\Posts;
use App\User;
use App\Http\Controllers\Controller;
use App\Http\Requests\PostFormRequest;
use Illuminate\Http\Request;

这是整个控制器。

<?php 
use App\Http\Controllers;
use App\Posts;
use App\User;
use App\Http\Controllers\Controller;
use App\Http\Requests\PostFormRequest;
use Illuminate\Http\Request;



class PostController extends Controller {

/**
 * Display a listing of the resource.
 *
 * @return Response
 */
    public function index()
    {
      //fetch 5 posts from database which are active and latest
      $posts = Posts::where('active',1)->orderBy('created_at','desc')->paginate(5);
      //page heading
      $title = 'Latest Posts';
      //return home.blade.php template from resources/views folder
      return view('blog/home')->withPosts($posts)->withTitle($title);
    }


/**
 * Show the form for creating a new resource.
 *
 * @return Response
 */
    public function create(Request $request)
    {
      // if user can post i.e. user is admin or author
      if($request->user()->can_post())
      {
        return view('blog.create');
      }    
      else 
      {
        return redirect('blog');
      }
    }


/**
 * Store a newly created resource in storage.
 *
 * @return Response
 */
    public function store(PostFormRequest $request)
    {
      $post = new Posts();
      $post->title = $request->get('title');
      $post->body = $request->get('body');
      $post->slug = str_slug($post->title);
      $post->author_id = $request->user()->id;
      if($request->has('save'))
      {
        $post->active = 0;
        $message = 'Post saved successfully';            
      }            
      else 
      {
        $post->active = 1;
        $message = 'Post published successfully';
      }
      $post->save();
      return redirect('edit/'.$post->slug)->withMessage($message);
    }


/**
 * Display the specified resource.
 *
 * @param  int  $id
 * @return Response
 */
    public function show($slug)
    {
      $post = Posts::where('slug',$slug)->first();
      if(!$post)
      {
         return redirect('/')->withErrors('requested page not found');
      }
      $comments = $post->comments;
      return view('posts.show')->withPost($post)->withComments($comments);
    }


/**
 * Show the form for editing the specified resource.
 *
 * @param  int  $id
 * @return Response
 */
    public function edit(Request $request,$slug)
    {
      $post = Posts::where('slug',$slug)->first();
      if($post && ($request->user()->id == $post->author_id || $request->user()->is_admin())){
          return view('posts.edit')->with('post',$post);
      }
      return redirect('blog')->withErrors('you have not sufficient permissions');
    }


/**
 * Update the specified resource in storage.
 *
 * @param  int  $id
 * @return Response
 */
    public function update(Request $request)
    {
      //
      $post_id = $request->input('post_id');
      $post = Posts::find($post_id);
      if($post && ($post->author_id == $request->user()->id || $request->user()->is_admin()))
      {
        $title = $request->input('title');
        $slug = str_slug($title);
        $duplicate = Posts::where('slug',$slug)->first();
        if($duplicate)
        {
          if($duplicate->id != $post_id)
          {
            return redirect('edit/'.$post->slug)->withErrors('Title already exists.')->withInput();
          }
          else 
          {
            $post->slug = $slug;
          }
        }
        $post->title = $title;
        $post->body = $request->input('body');
        if($request->has('save'))
        {
          $post->active = 0;
          $message = 'Post saved successfully';
          $landing = 'edit/'.$post->slug;
        }            
        else {
          $post->active = 1;
          $message = 'Post updated successfully';
          $landing = $post->slug;
        }
        $post->save();
             return redirect($landing)->withMessage($message);
      }
      else
      {
        return redirect('blog')->withErrors('you have not sufficient permissions');
      }
    }


/**
 * Remove the specified resource from storage.
 *
 * @param  int  $id
 * @return Response
 */
    public function destroy(Request $request, $id)
    {
      //
      $post = Posts::find($id);
      if($post && ($post->author_id == $request->user()->id || $request->user()->is_admin()))
      {
        $post->delete();
        $data['message'] = 'Post deleted Successfully';
      }
      else 
      {
        $data['errors'] = 'Invalid Operation. You have not sufficient permissions';
      }
      return redirect('blog')->with($data);
    }


}

谢谢。

Answer 1

打开 App\Provider\RouteServiceProvider.php 并添加这一行

protected $namespace = 'App\Http\Controllers'; 

在这个下面

public const HOME = '/home';

你的错误就会消失。

Answer 2

如果composer dumpautoload没有帮助，请检查您是否有正确的namespace声明，PostController.php并仔细检查类名/路由声明中的拼写错误。

如果检查composer.json自动加载配置失败，它应该是这样的：

"autoload": {
    "psr-4": {
        "App\\": "app/"
    }
},

作为旁注，你可以使用这样的东西：

Route::get('blog',PostController::class . '@index');

或者

Route::get('blog',\App\Http\Controllers\PostController::class . '@index');

有了这个，如果找不到文件/有错字，任何体面的 IDE 都应该发出某种警告

编辑：

你的文件应该有这样一行

namespace App\Http\Controllers;

在文件开始时，紧接着<?php或<?php declare(strict_types = 1);如果您正在使用 php7 严格模式