test/app/Http/Models/Asset.php

<?php

namespace App\Http\Models;

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

class Asset extends Model
{
    use SoftDeletes;
    protected $primaryKey = 'id';
    protected $table = 'asset';
    public $guarded=[];

    public function assetType()
    {
        return $this->belongsTo(AssetType::class, 'type_id', 'id');
    }
}