Class App\Http\Controllers\PostController 不存在

Question

Let me just start by saying "I know this question gets asked a lot." believe me when i say nothing has worked for me.

I have created a controller called PostController . This is a controller for my blog. When I navigate to my blog i get the following error Class App\Http\Controllers\PostController does not exist even though it does exist. The controller is called PostController.php . Here is what the route looks like Route::get('blog','PostController@index'); . I have read that running some composer commands will help but none of them have helped me. composer dumpautoload as well as composer update . Am i missing some step here? Anyone run into a similar problem? Please let me know if additional information is needed.

EDIT Here are the namespaces at the top.

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

Here is the whole Controller.

<?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);
    }


}

Thanks.

Answer 1

Open App\\Provider\\RouteServiceProvider.php and add this line

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

below this

public const HOME = '/home';

and your error will vanish.

Answer 2

If composer dumpautoload is not helping then check if you have proper namespace declaration in PostController.php and double check for typos in class name/route declaration.

If this fails check composer.json for autoload configuration, it should have something like this:

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

As a side note you could use something like this:

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

or

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

With this any decent IDE should give some kind of a warning if it can't find the file/there's a typo

Edit :

Your file should have a line like this

namespace App\Http\Controllers;

At the beggining of the file, right after <?php or <?php declare(strict_types = 1); if you're using php7 strict mode

Answer 3

Open App\\Providers\\RouteServiceProvider.php and uncomment row:

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

Thank you, this metod help for me!

Answer 4

if you use laravel 8.* then Open App->Providers>RouteServiceProvider.php and uncomment this line:

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

Answer 5

This happened in my upgrade from Laravel 7.x to 8.x. My fix was to change my routing from:

Route::resource('posts', 'PostController');

to:

Route::resource('posts', \App\Http\Controllers\PostController::class);

or if you import the PostController class:

Route::resource('posts', PostController::class);

The reason for this change is explained in the upgrade from Laravel 7.x to 8.x guide: https://laravel.com/docs/8.x/upgrade#routing

It explains that it 8.x provides support to allow route declarations to use standard PHP callable syntax. The alternative solution is what others have mentioned, and add protected $namespace = 'App\\Http\\Controllers'; to RouteServiceProvider .

Answer 6

Simply, You would have to add class into the routes\web.php file as given below:

use App\Http\Controllers\PostController;