hasOne(User::class,'uid','user_id'); } public function merchant() { return $this->hasOne(Merchant::class,'mer_id','mer_id'); } public function orderInfo() { return $this->hasOne(StoreOrder::class,'order_sn','order_sn'); } public function refundOrder() { return $this->hasOne(StoreRefundOrder::class,'refund_order_sn','order_sn'); } }