解决Laravel控制器中创建资源时thread_id缺失的错误

public function store(Request $request, Thread $thread)
{
    $request->validate([
        'title' => ['required', 'min:3'],
        'description' => ['required'],
        'channel_id' => ['required'],
        'thread_id' => ['required'] // 此处验证可能存在误解
    ]);

    Thread::create([
        'title' => $request->title,
        'description' => $request->description,
        'user_id' => auth()->user()->id,
        'channel_id' => $request->channel_id,
    ]);

    // 尝试使用路由模型绑定的$thread，但此时它并非刚创建的Thread实例
    Subscribe::query()->create([
        'thread_id' => $thread->id, // 错误发生在此处：$thread->id 可能为null或不正确
        'user_id' => auth()->user()->id
    ]);
    return redirect('/');
}

<form action="{{route('threads.store')}}" method="post">
    @csrf
    <input type="hidden" name="thread_id" value="{{$thread->id}}">
    <!-- 其他表单字段 -->
</form>

<?php

namespace App\Http\Controllers;

use App\Models\Thread;
use App\Models\Subscribe;
use Illuminate\Http\Request;

class ThreadController extends Controller
{
    public function store(Request $request)
    {
        // 1. 验证请求数据
        $request->validate([
            'title' => ['required', 'min:3'],
            'description' => ['required'],
            'channel_id' => ['required', 'exists:channels,id'], // 建议验证channel_id是否存在
            // 'thread_id' => ['required'] - 此验证项应移除，因为thread_id是在创建后生成的
        ]);

        // 2. 创建新的Thread实例并捕获其返回值
        $thread = Thread::create([
            'title' => $request->title,
            'description' => $request->description,
            'user_id' => auth()->user()->id,
            'channel_id' => $request->channel_id,
        ]);

        // 3. 使用新创建的$thread实例的ID来创建Subscribe记录
        Subscribe::query()->create([
            'thread_id' => $thread->id, // 正确使用刚创建的Thread ID
            'user_id' => auth()->user()->id
        ]);

        // 4. 重定向用户
        return redirect('/');
    }

    // 如果create方法是用于显示创建表单，则不需要Thread模型绑定
    public function create()
    {
        // 传递所有可用的频道到视图，而不是一个具体的thread实例
        $channels = \App\Models\Channel::all();
        return view('answer-question.thread.thread-create', compact('channels'));
    }
}

// 如果在Thread模型中定义了hasMany关系
// public function subscribes() { return $this->hasMany(Subscribe::class); }

// 那么在控制器中可以这样创建：
$thread = Thread::create([...]);
$thread->subscribes()->create([
    'user_id' => auth()->user()->id
]);