Laravel-尝试显示特定线程的结果为空

我的数据库充满了数据，显示了所有的数据工作。但是如果我试图只显示一个特定的线程，我会得到一个空的结果，我不知道为什么

web.php

---

将放映路线重命名为以下名称：

Route::get('/threads/{thread}', 'ThreadsController@show');

---

您正在加载的是线程对象，而不是线程对象。

根据本教程，路径：：get'/Threads/{id}'，'ThreadsController@show'; 应该进行相同的操作，但是我使用{id}再次得到一个空结果。你能解释一下为什么{id}不起作用吗？部分名称应该与函数中提示的类型变量相同。

<?php

namespace App\Http\Controllers;

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

class ThreadsController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $threads = Thread::latest()->get();
        return view('threads.index', compact('threads'));
        //return $threads;
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Display the specified resource.
     *
     * @param  \App\Thread  $thread
     * @return \Illuminate\Http\Response
     */
    public function show(Thread $thread)
    {
        //return view('threads.show', compact('thread'));
        return $thread;
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  \App\Thread  $thread
     * @return \Illuminate\Http\Response
     */
    public function edit(Thread $thread)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\Thread  $thread
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, Thread $thread)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Thread  $thread
     * @return \Illuminate\Http\Response
     */
    public function destroy(Thread $thread)
    {
        //
    }
}

php artisan --version
Laravel Framework 5.4.32

Route::get('/threads/{thread}', 'ThreadsController@show');