fix : recommend logix

Author: lkw9241

src/main/java/com/back/domain/cocktail/repository/CocktailRepository.java

@@ -36,12 +36,10 @@ Page<Cocktail> searchWithFilters(@Param("keyword") String keyword,
                                      @Param("types") List<CocktailType> types,
                                      @Param("bases") List<AlcoholBaseType> bases,
                                      Pageable pageable);
-    //유사칵테일 추천관련
-    List<Cocktail> findByAlcoholStrengthAndIdNot(AlcoholStrength strength, Long excludeId);
 
-    //유사칵테일 추천관련
-    List<Cocktail> findByCocktailTypeAndIdNot(CocktailType type, Long excludeId);
-
-    //유사칵테일 추천관련
-    List<Cocktail> findByAlcoholBaseTypeAndIdNot(AlcoholBaseType baseType, Long excludeId);
+    List<Cocktail> findByAlcoholStrengthAndAlcoholBaseTypeAndIdNot(
+            AlcoholStrength alcoholStrength,
+            AlcoholBaseType alcoholBaseType,
+            Long id
+    );
 }

src/main/java/com/back/domain/cocktail/service/RecommendService.java

@@ -6,10 +6,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
-import java.util.ArrayList;
-import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Set;
 
 @Service
 @RequiredArgsConstructor
@@ -21,24 +18,20 @@ public List<CocktailRecommendResponseDto> recommendRelatedCocktails(Long cocktai
         Cocktail current = cocktailRepository.findById(cocktailId)
                 .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 칵테일입니다."));
 
-        // 3가지 조건으로 유사 칵테일 조회
-        List<Cocktail> byAlcoholStrength = cocktailRepository.findByAlcoholStrengthAndIdNot(current.getAlcoholStrength(), current.getId());
-        List<Cocktail> byCocktailType = cocktailRepository.findByCocktailTypeAndIdNot(current.getCocktailType(), current.getId());
-        List<Cocktail> byAlcoholBase = cocktailRepository.findByAlcoholBaseTypeAndIdNot(current.getAlcoholBaseType(), current.getId());
+       // 알콜 강도와 베이스 타이이 같은 칵테일만 조회
+        List<Cocktail> related = cocktailRepository
+                .findByAlcoholStrengthAndAlcoholBaseTypeAndIdNot(
+                        current.getAlcoholStrength(),
+                        current.getAlcoholBaseType(),
+                        current.getId()
+                );
 
-        // 합치고 중복 제거
-        Set<Cocktail> combined = new LinkedHashSet<>();
-        combined.addAll(byAlcoholStrength);
-        combined.addAll(byCocktailType);
-        combined.addAll(byAlcoholBase);
-
-        List<Cocktail> combinedList = new ArrayList<>(combined);
-        if (combinedList.size() > maxSize) {
-            combinedList = combinedList.subList(0, maxSize);
+        if (related.size() > maxSize) {
+            related = related.subList(0, maxSize);
         }
 
         // DTO로 변환
-        return combinedList.stream()
+        return related.stream()
                 .map(c -> new CocktailRecommendResponseDto(
                         c.getId(),
                         c.getCocktailNameKo(),