为什么该变量在节目中未定义？（已解决）

Question

当我点击进入音乐家的表演页面时，它给了我这个错误：

这是 Admin/MusicianController 中的表演功能

public function show(Musician $musician)

    {
        return view('admin.musicians.show', compact('musician')); 
    }

这些是管理员路由

Route::middleware('auth')
    ->namespace('Admin')
    ->name('admin.')
    ->prefix('admin')
    ->group(function() {

        Route::get('/', 'HomeController@index')->name('welcome');
        Route::resource('musicians', 'MusicianController'); 
    }); 

这是音乐家表演的链接

<a class="btn btn-warning" href="{{route('admin.musicians.show', $musician->id)}}">Vedi il profilo</a>

admin.welcome所在的地方

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Musician;

class HomeController extends Controller
{
    public function index(Musician $musician) {
        return view('admin.welcome', compact('musician')); 
    }
}

Answer 1

已解决

Admin/HomeController 的变化

class HomeController extends Controller
{
    public function index() {
        $user = Auth::user();
        $musician = Musician::where('user_id', Auth::id())->get();

        return view('admin.musicians.index', compact('musician', 'user')); 
    }
}

Admin/MusicianController 的 index 函数，我为此创建了一个新视图（admin.musicians.index），它也可以是 admin.welcome 视图，但是在使用 index 的控制器中看起来更清晰

public function index()
    {
        return Musician::where('user_id', Auth::id())->with('user')->get();
    }

admin.musicians.index 视图，我使用 1 对 1 关系来捕捉音乐家->id，User 和 Musician 模型都有 hasOne() 函数相互指向

<div class="profile">
        <h2>Vedi il tuo profilo</h2>
        
        {{-- la rotta prende l'id del musicista legato all'utente autenticato --}}
        <a class="btn btn-warning" href="{{ route('admin.musicians.show', $user->musician->id) }}">Vedi il profilo</a>
        {{ $user->name }}
        {{$user->id}}

        {{-- questo è per capire se prendevo dati dalla relazione 1a1 --}}
        {{$user->musician->stagename}} 


        
</div>

admin.musicians.show 视图，现在我可以看到与注册用户关联的音乐家的名字，问题解决了。

@extends('layouts.app')

@section('content')
<div class="container">
    SHOW PROFILO
    
    <h1>Nome d'arte:</h1>
    <p>{{$musician->stagename}}</p>
    
</div>
@endsection

型号仅供参考

1. 应用\用户

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name','surname', 'email', 'password','address'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    public function musician() {
        return $this->hasOne('App\Musician'); 
    }
}

1. 应用\音乐家

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Musician extends Model
{
    protected $fillable = [
        'user_id', 
        'stagename',
        'slug', 
        'description',
        'bio',
        'typology',
        'cover'
    ]; 

    public function user() {
        return $this->hasOne('App\User'); 
    }

    public function genres() {
        return $this->belongsToMany('App\Genre'); 
    }

    public function sponsorships() {
        return $this->belongsToMany('App\Sponsorship'); 
    }

    public function messages() {
        return $this->belongsToMany('App\Message'); 
    }

    public function reviews() {
        return $this->belongsToMany('App\Review'); 
    }
}

Answer 2

你可以做两件事：

class HomeController extends Controller
{
    public function index(Musician $musician) {
         dd($musician);
        return view('admin.welcome', compact('musician')); 
    }
}

如果 dd($musician);什么都不返回然后写

class HomeController extends Controller
    {
        public function index() {
             $musician= Musician::all();
            return view('admin.welcome', compact('musician')); 
        }
    }

另一件事

public function show(Musician $musician,$id)

    {
        $musician= Musician ::findOrFail($id);
        return view('admin.musicians.show', compact('musician')); 
    }