baoshi-was/app/WorkOrderType.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

use App\Traits\ModelLogChanging;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\HasOne;

class WorkOrderType extends Model
{
    use ModelLogChanging;

    protected $fillable = [
        'name',  // 工单类型名称
        'table_name', // 关联表
        'prent_id',   // 父类型
        'level',      // 层级
        'remark'      // 描述
    ];

    // 子层级
    public function children(): HasMany
    {
        return $this->hasMany(WorkOrderType::class,'prent_id','id');
    }

    // 父层级
    public function prent(): HasOne
    {
        return $this->hasOne(WorkOrderType::class,'prent_id');
    }
}