screen/application/common/model/UserTax.php

<?php

namespace app\common\model;

use think\Model;


class UserTax extends Model
{
    protected $type=[
        'tax'=>'json',
    ];

    public static function fromOrder(Orders $orders){
        if($orders['tax']){
            $has=self::where('user_id',$orders['user_id'])->where('tax',json_encode($orders['tax'],JSON_UNESCAPED_UNICODE))->find();
            if(!$has) {
                self::create([
                    'user_id' => $orders['user_id'],
                    'tax' => $orders['tax'],
                ]);
            }
        }
    }
}