我更新了我的一个项目到Laravel Livewire V3，遇到了一些障碍。我的大多数路由都工作正常，但有几个由于某种原因抛出错误Can't set model as property if it hasn't been persisted yet，对于我的生活，我无法弄清楚。我对我的大多数路线都没有问题--只是随机的几个，就像下面的路线。

web.php

...
Route::get('/evaluation/{evaluation}/edit', App\Livewire\Evaluations\Edit::class)->middleware(IsAdminMiddleware::class)->name('evaluation.edit');
...

编辑.php

<?php

namespace App\Livewire\Evaluations;

use App\Models\Evaluation;
use App\Models\Farm;
use App\Models\User;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Gate;
use Livewire\Component;

class Edit extends Component
{
    public $user, $farm, $evaluation, ...;

    public function mount(User $user, Evaluation $evaluation, Farm $farm) {
        $this->user = $user;
        $this->farm = $farm;
        $this->evaluation = $evaluation;
        $this->farm_id = $evaluation->farm_id;
        $this->user_id = $evaluation->user_id;
        ...
    }
...

评测.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Evaluation extends Model
{
    protected $guarded = [];
    use SoftDeletes;

    public function user()
    {
        return $this->belongsTo(User::class, 'user_id');
    }

    public function farm()
    {
        return $this->belongsTo(Farm::class, 'farm_id');
    }
...