LARAVEL8：嘗試存取 Null 上的「id」屬性
我是 Laravel 的新手，我正在從 Laracast 學習它。 這是我的問題，我正在創建一個評論表單，它的 php 程式碼如下所示：
<section class="col-span-8 col-start-5 mt-10 space-y-6">
<!-- Post form -->
<form method="POST" action="/post/{{ $post->slug }}/comments" class="border border-gray-200 p-6 rounded-xl">
@csrf
<header class="flex items-center">
<img src="https://i.pravatar.cc/100?id={{ auth()->id() }}" alt="" width="40" height="40" class="rounded-full">
<h2 class="ml-3 ">Want to participate?</h2>
</header>
<div class="mt-6">
<textarea class="w-full text-sm focus:outline-none focus:ring"
name="body"
cols="30" rows="10"
placeholder="Quick,think of something to say!" ></textarea>
</div>
<div>
<button type="submit" class="bg-blue-500 text-white uppercase font-semi-bold text-xs py-2 px-10 rounded-2xl hover:bg-blue-600">Post</button>
</div>
這是對應的路線：
Route::post('post/{post:slug}/comments',[PostCommentsController::class, 'store']);
控制器：，我懷疑這裡可能有問題'user_id'=> request()->user()->id，我嘗試了多種方法來實現這種方法，例如auth()-> id, Auth::user()->id
<?php
namespace AppHttpControllers;
use AppModelsPost;
class PostCommentsController extends Controller
{
public function store(Post $post){
request()->validate([
'body'=>'required'
]);
$post->comments()->create([
'user_id'=> request()->user()->id,
'body' => request('body')
]);
return back();
}
}
這是評論的遷移表
Schema::create('comments', function (Blueprint $table) {
$table->id();
$table->foreignId('post_id')->constrained()->cascadeOnDelete();
$table->foreignId('user_id')->constrained()->cascadeOnDelete();
$table->text('body');
$table->timestamps();
帖子遷移表：
Schema::create('posts', function (Blueprint $table) {
$table->id();
$table->foreignId('user_id')->constrained()->cascadeOnDelete();
$table->foreignId('category_id');
$table->string('slug')->unique();
$table->string('title');
$table->text('excerpt');
$table->text('body');
$table->timestamps();
$table->timestamp('published_at')->nullable();
});
如果我點擊發布按鈕，我會收到上述錯誤，我已盡力解決此問題，但我無法解決。有人可以幫助我我的程式碼有什麼問題嗎？我的問題可能看起來很天真，因為我是 stackoverflow 社群的新手
