在模型層中（Models）添加三行代碼搞定
use ?Illuminate\Database\Eloquent\SoftDeletes;
use ?SoftDeletes;
protected ?$dates=['delete_at'];
具體用法：
<?php
namespace ?App\Models;
use ?Illuminate\Database\Eloquent\Model;
use ?Illuminate\Database\Eloquent\SoftDeletes;
class ?RelStudentState ?extends ?Model
{
useSoftDeletes;
protected ?$table='rel_student_state';
protected ?$fillable=['student_guid','state'];
protected ?$hidden=['created_at','updated_at','deleted_at'];
protected ?$dates=['delete_at'];
}
