From 38bcbe726cade5be98685e450251560294c1a38a Mon Sep 17 00:00:00 2001
From: myqewr <mygongjoo@gmail.com>
Date: Mon, 29 Dec 2025 19:42:59 +0900
Subject: [PATCH] =?UTF-8?q?fix=20:=20=ED=95=B4=EC=8B=9C=ED=83=9C=EA=B7=B8?=
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 =?UTF-8?q?=20=EC=8B=9C=20=EB=A7=A4=EC=B9=AD=EB=90=98=EB=8A=94=20=EC=83=81?=
 =?UTF-8?q?=ED=92=88=20=EC=97=86=EC=9D=84=20=EB=95=8C=20=EC=97=90=EB=9F=AC?=
 =?UTF-8?q?=20=EB=B0=9C=EC=83=9D=ED=95=98=EB=8A=94=20=EC=83=81=ED=99=A9=20?=
 =?UTF-8?q?=EC=88=98=EC=A0=95?=
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---
 .../service/post/LoadProductsByHashTagService.java    | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/ftm/server/application/service/post/LoadProductsByHashTagService.java b/src/main/java/com/ftm/server/application/service/post/LoadProductsByHashTagService.java
index bfeda55..71d89da 100644
--- a/src/main/java/com/ftm/server/application/service/post/LoadProductsByHashTagService.java
+++ b/src/main/java/com/ftm/server/application/service/post/LoadProductsByHashTagService.java
@@ -44,7 +44,7 @@ public LoadProductsByHashTagVoWrapper execute(
                     productIdAndScoreList.stream().filter(a -> a.getScore() < score).toList();
         }
 
-        if (productIdAndScoreList.size() == 0) {
+        if (productIdAndScoreList.isEmpty()) {
             return LoadProductsByHashTagVoWrapper.of(List.of(), false, 0.0);
         }
 
@@ -58,6 +58,10 @@ public LoadProductsByHashTagVoWrapper execute(
                             new FindByProductHashTagsQuery(hashtagList));
         }
 
+        if (postProducts.isEmpty()) {
+            return LoadProductsByHashTagVoWrapper.of(List.of(), false, 0.0);
+        }
+
         Map<Long, PostProduct> postProductMap =
                 postProducts.stream()
                         .collect(
@@ -70,6 +74,8 @@ public LoadProductsByHashTagVoWrapper execute(
         int beforeSize = productIdAndScoreList.size();
         Set<Long> tempProductIds =
                 postProducts.stream().map(PostProduct::getId).collect(Collectors.toSet());
+
+        // 캐시에 존재하는 상품 중(인기순으로 정렬되어 있음), 해시태그와 관련 있는 상품만 조회 + limit 만큼 자르기
         List<ProductIdAndScoreVo> productIdAndScoreVoList =
                 productIdAndScoreList.stream()
                         .filter(vo -> tempProductIds.contains(vo.getProductId())) // DB에 존재하는 상품만
@@ -96,7 +102,8 @@ public LoadProductsByHashTagVoWrapper execute(
                 loadProductAndUserLikeVos.stream()
                         .collect(
                                 Collectors.toMap(
-                                        LoadProductAndUserLikeVo::getProductId, // key: productId
+                                        LoadProductAndUserLikeVo::getProductId, // key:
+                                        // productId
                                         Function.identity() // value: 해당 PostProduct 객체 자체
                                         ));