一个订单只能购买一个特价商品 但是同一个特价商品可以购买多个

app/Service/ShopCarService.php

@@ -32,6 +32,7 @@ class ShopCarService implements ShopCarServiceInterface
 			$goods_exists = ShopCar::where([
 				['money','=',0.01],
 				['user_id','=',$params['user_id']]
+				['good_id','=',$params['good_id']]
 			])
 			->exists();
 			if($goods_exists){