hasOne(User::class, 'id', 'user_id'); } function goods() { return $this->hasOne(Goods::class, 'id', 'goods_id'); } function coupon() { return $this->hasOne(Coupon::class, 'id', 'coupon_id'); } function payment() { return $this->hasOne(Payment::class, 'oid', 'oid'); } }