Laravel 编辑函数重定向

Question

我正在编写一个测验应用程序，并尝试向其中添加编辑功能。单击 'Submit' 按钮，我收到错误消息 缺少 [Route: quiz/show] [URI: quiz/{quiz}]. 的必需参数我该如何解决？我是 Laravel 的初学者，所以如果你能帮助我就太好了。

我的web.php

<?php

use Illuminate\Support\Facades\Route;
use App\Http\Controllers\ProductController;
use App\Http\Controllers\MainController;
use App\Http\Controllers\QuizController;
use App\Http\Controllers\DashboardController;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});


Route::middleware(['auth:sanctum', 'verified'])->get('/dashboard', function () {
    return view('dashboard');
})->name('dashboard');

Route::get('dashboard', 'App\Http\Controllers\DashboardController@index')->name('dashboard');

Route::get('quiz/create', 'App\Http\Controllers\QuizController@create');
Route::post('quiz', 'App\Http\Controllers\QuizController@store');
Route::get('quiz/{quiz?}', 'App\Http\Controllers\QuizController@show')->name('quiz/show');

Route::get('quiz/{quiz}/questions/create', 'App\Http\Controllers\QuestionController@create');
Route::post('quiz/{quiz}/questions', 'App\Http\Controllers\QuestionController@store');
Route::delete('quiz/{quiz}/questions/{question}', '\App\Http\Controllers\QuestionController@destroy');
Route::get('question/edit', '\App\Http\Controllers\QuestionController@edit')->name('question/edit');
Route::patch('question/{question}', '\App\Http\Controllers\QuestionController@update')->name('question/update');

Route::get('startquiz/{quiz}-{slug}', 'App\Http\Controllers\StartQuizController@show');
Route::post('startquiz/{quiz}-{slug}', 'App\Http\Controllers\StartQuizController@store');

我的问题控制器

<?php

namespace App\Http\Controllers;

use App\Models\Question;
use App\Models\Quiz;
use Illuminate\Http\Request;

class QuestionController extends Controller
{
    public function create(Quiz $quiz) {
        return view('question.create', compact('quiz'));
    }

    public function store(Quiz $quiz) {
        $data = request()->validate([
            'question.question' => 'required',
            'answers.*.answer' => 'required',
        ]);

        $question = $quiz->questions()->create($data['question']);
        $question->answers()->createMany($data['answers']);

        return redirect('/quiz/'.$quiz->id);
    }

    public function destroy(Quiz $quiz, Question $question) {
        $question->answers()->delete();
        $question->delete();

        return redirect($quiz->path());
    }
    public function edit(Question $question) {
       return view('quiz.edit', compact('question'));
    }

    public function update(Request $request, Question $question, Quiz $quiz) {
        //$request->validate([
            //'question' => 'required',
        //]);
        $question->update($request->all());
        //dd($quiz);
        return redirect()->route('quiz/show', ['quiz' => $question->quiz])
                        -> with('success', 'Question updated successfully');
    }
}

我的edit.blade

<html>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
    <body>


        <h1>Edit Question</h1>
        <form action="{{ route('question/update',$question->id) }}" method="POST">
            @csrf
            @method('PATCH')

            <div class="container">
                <div class="row justify-content-center">
                    <div class="col-xs-12 col-sm-12 col-md-12">
                            <div class="form-group">
                                <label for="question">Question</label>
                                <input type="text" class="form-control" name="question" value="{{ $question->name }}"placeholder="Enter Question">
                                <small id="questionHelp" class="form-text text-muted">Type in your edited question.</small>
                            </div>
                    </div>
                    <div class="col-xs-12 col-sm-12 col-md-12 text-center">
                        <button type="submit" class="btn btn-primary">Submit</button>
                    </div>
                </div>
            </div>

        </form>


    </body>
</html>

Answer 1

您的“更新”路线没有采用任何参数。您的控制器的 update 方法看起来像它想使用路由模型绑定但是没有参数所以您得到一个不存在的 Quiz 实例，它没有 id 所以它试图使用 null 生成 URL 时不能对路由参数执行此操作。

您需要调整路由 URI 定义以获取 question 和 quiz 的参数。也许：

Route::patch('quiz/{quiz}/question/{question}', ...)

如果您不想将路由参数用于测验或问题，您将不得不调整控制器以从请求输入中获取信息。

其他快速选项：

您应该能够从问题中推导出测验，因此您不需要通过测验：

Route::patch('question/{question}', ...)

public function update(Request $request, Question $question)
{
    $question->update($request->all());

    return redirect()->route('quiz/show', ['quiz' => $question->quiz])
        ->with('success', 'Question updated successfully');
}

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