Laravel undefinierte Variable in View-Datei

Question

Ich erhalte einen Fehler in Laravel 5.3.9 auf der Dashboard-Ansicht mit einer undefinierten Variable Beiträge. Ich versuche, alle Posts von dem Benutzer aufzulisten, den er in der Datenbank hat. Hier ist mein Code so weit:

UserController.php

<?php 

namespace App\Http\Controllers; 

use App\User; 
use Illuminate\Http\Request; 
use Illuminate\Support\Facades\Auth; 


class UserController extends Controller 
{ 
    public function postSignUp(Request $request) 
    { 
     // Validate the entry of the sign up form 
     $this->validate($request, [ 
      'email'  => 'email | required | unique:users', 
      'first_name' => 'required | max:120', 
      'password' => 'required | min:6' 
     ]); 

     $email = $request['email']; 
     $first_name = $request['first_name']; 
     $password = bcrypt($request['password']); 

     $user = new User(); 
     $user->email = $email; 
     $user->first_name = $first_name; 
     $user->password = $password; 

     $user->save(); 

     Auth::attempt($user); 

     return redirect()->route('dashboard'); 

    } 

    public function postSignIn(Request $request) 
    { 
     // Validate the sign in form 
     $this->validate($request, [ 
      'email'  => 'email | required', 
      'password' => 'required | min:6' 
     ]); 

     if(Auth::attempt(['email' => $request['email'], 'password' => $request['password']])) { 
      return view('dashboard'); 
     } 

     return redirect()->back(); 
    } 
} 

?> 

PostController.php

<?php 

namespace App\Http\Controllers; 

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

class PostController extends Controller 
{ 
    public function getDashboard() 
    { 
     $posts = Post::all(); 
     return view('dashboard', [ 'posts' => $posts ]); 
    } 

    public function postCreatePost(Request $request) 
    { 
     // Validate the post text field 
     $this->validate($request, [ 
      'body' => 'required | max:1000' 
     ]); 

     $post = new Post(); 
     $post->body = $request['body']; 
     $message = "There was an error"; 

     if($request->user()->posts()->save($post)) { 
      $message = "Post succesfully created"; 
     } 
     return redirect()->route('dashboard')->with([ 'message' => $message ])->compact($posts); 
    } 

    public function getDeletePost($post_id) 
    { 
     $post = Post::where('id', $post_id)->first(); 
     $post->delete(); 

     return redirect()->route('dashboard')->with(['message' => 'Post succesfully deleted']); 
    } 
} 

dashboard.blade.php

@foreach($posts as $post) 
     <article class="post"> 
      <p>{{ $post->body }}</p> 
      <div class="info"> 
       Posted by {{ $post->user->first_name }} on {{ $post->user->created_at }} 
      </div> 
      <div class="interaction"> 
       <a href="#">Like</a> | 
       <a href="#">Dislike</a> | 
       <a href="#">Edit</a> | 
       <a href="{{ route('post.delete', [ 'post_id' => $post->id ]) }}">Delete</a> 
      </div> 
     </article> 
     @endforeach 

web.app Routen

<?php 

use App\Task; 
use Illuminate\Http\Request; 

/* 
|-------------------------------------------------------------------------- 
| Web Routes 
|-------------------------------------------------------------------------- 
| 
| This file is where you may define all of the routes that are handled 
| by your application. Just tell Laravel the URIs it should respond 
| to using a Closure or controller method. Build something great! 
| 
*/ 

Route::group(['middleware' => ['web']], function() 
{ 
    Route::get('/', function() { 
     return view('welcome'); 
    })->name('home'); 

    // Route for signed up users 
    Route::post('/signup', [ 
     'uses' => 'UserController@postSignUp', 
     'as' => 'signup' 
    ]); 

    // Redirect to signin 
    Route::post('/signin', [ 
     'uses' => 'UserController@postSignIn', 
     'as' => 'signin' 
    ]); 

    //Redirect to the dashboard 
    Route::get('/dashboard', [ 
     'uses'  => 'PostController@getDashboard', 
     'as'   => 'dashboard', 
     'middleware' => 'auth' 
    ]); 

    // Create a new post and route 
    Route::post('/createpost', [ 
     'uses' => 'PostController@postCreatePost', 
     'as' => 'post.create' 
    ]); 

    // Create a new post and route 
    Route::get('/delete-post/{post_id}', [ 
     'uses'  => 'PostController@getDeletePost', 
     'as'   => 'post.delete', 
     'middleware' => 'auth' 
    ]); 

}); 

Und die Fehler, die ich

ErrorException in 3bda00b66abf627abd64dcb541751a9b753d4384.php line 33: 
Undefined variable: posts (View: C:\wamp\www\laravel\resources\views\dashboard.blade.php) 
    in 3bda00b66abf627abd64dcb541751a9b753d4384.php line 33 
at CompilerEngine->handleViewException(object(ErrorException), '1') in PhpEngine.php line 44 
at PhpEngine->evaluatePath('C:\wamp\www\laravel\storage\framework\views/3bda00b66abf627abd64dcb541751a9b753d4384.php', array('__env' => object(Factory), 'app' => object(Application), 'errors' => object(ViewErrorBag))) in CompilerEngine.php line 59 
at CompilerEngine->get('C:\wamp\www\laravel\resources\views/dashboard.blade.php', array('__env' => object(Factory), 'app' => object(Application), 'errors' => object(ViewErrorBag))) in View.php line 150 
at View->getContents() in View.php line 121 
at View->renderContents() in View.php line 86 
at View->render() in Response.php line 45 
at Response->setContent(object(View)) in Response.php line 201 
at Response->__construct(object(View)) in Router.php line 1042 
at Router->prepareResponse(object(Request), object(View)) in Router.php line 642 
at Router->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 53 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in SubstituteBindings.php line 41 
at SubstituteBindings->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in VerifyCsrfToken.php line 64 
at VerifyCsrfToken->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in ShareErrorsFromSession.php line 49 
at ShareErrorsFromSession->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in StartSession.php line 64 
at StartSession->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in AddQueuedCookiesToResponse.php line 37 
at AddQueuedCookiesToResponse->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in EncryptCookies.php line 59 
at EncryptCookies->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 104 
at Pipeline->then(object(Closure)) in Router.php line 644 
at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php line 618 
at Router->dispatchToRoute(object(Request)) in Router.php line 596 
at Router->dispatch(object(Request)) in Kernel.php line 267 
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request)) in Pipeline.php line 53 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in CheckForMaintenanceMode.php line 46 
at CheckForMaintenanceMode->handle(object(Request), object(Closure)) in Pipeline.php line 137 
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33 
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 104 
at Pipeline->then(object(Closure)) in Kernel.php line 149 
at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 116 
at Kernel->handle(object(Request)) in index.php line 53 

bekommen bin ich nicht sicher, wie Variablen $ posts Dateien in der Ansicht zu übergeben.

Answer 1

Wenn $posts null ist, könnte dieser Fehler auftreten. Sie können versuchen, foreach Einkapseln mit

@if (isset($posts)) 
    @foreach ($posts as $post) 
    ... 
    @endforeach 
@endif 

Answer 2

Sie wollen zuerst am Regler prüfen, ob $ post wird alle Daten zurück. Also gleich nach dieser Linie;

$ posts = Post :: all();

Sie einen

dd ($ posts);

Wenn dies irgendwelche Datensätze zurückgibt, können Sie Ihre Ansicht untersuchen. Wie @ Berkayks Antwort erwähnt. Sie sollten in Ihrer Sicht einige Überprüfungen durchführen, um sicherzustellen, dass Ihre Ansicht keinen Fehler auslöst ODER eine andere Ansicht insgesamt zurückgibt, indem Sie die Anzahl der Datensätze am Controller überprüfen.