feat: topicId 배열로 get 요청 시, 해당 토픽들 상세 조회 API 구현 (#142)

backend/src/main/java/com/mapbefine/mapbefine/controller/TopicController.java

@@ -18,6 +18,7 @@
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
@@ -69,6 +70,13 @@ public ResponseEntity<List<TopicResponse>> findAll() {
         return ResponseEntity.ok(topics);
     }
 
+    @GetMapping("/ids")
+    public ResponseEntity<List<TopicDetailResponse>> findByIds(@RequestParam List<Long> ids) {
+        List<TopicDetailResponse> responses = topicQueryService.findAllByIds(ids);
+
+        return ResponseEntity.ok(responses);
+    }
+
     @GetMapping("/{id}")
     public ResponseEntity<TopicDetailResponse> findById(@PathVariable Long id) {
         TopicDetailResponse response = topicQueryService.findById(id);

backend/src/main/java/com/mapbefine/mapbefine/repository/TopicRepository.java

@@ -1,6 +1,7 @@
 package com.mapbefine.mapbefine.repository;
 
 import com.mapbefine.mapbefine.entity.Topic;
+import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
@@ -10,6 +11,8 @@
 @Repository
 public interface TopicRepository extends JpaRepository<Topic, Long> {
 
+    List<Topic> findByIdIn(List<Long> ids);
+
     @Modifying(clearAutomatically = true)
     @Query("update Topic t set t.isDeleted = true where t.id = :topicId")
     void deleteById(@Param("topicId") Long topicId);

backend/src/main/java/com/mapbefine/mapbefine/service/TopicQueryService.java

@@ -38,6 +38,12 @@ public List<TopicResponse> findAll() {
                 .collect(Collectors.toList());
     }
 
+    public List<TopicDetailResponse> findAllByIds(List<Long> ids) {
+        return topicRepository.findByIdIn(ids).stream()
+                .map(TopicDetailResponse::from)
+                .collect(Collectors.toList());
+    }
+
     public TopicDetailResponse findById(Long id) {
         Topic topic = topicRepository.findById(id)
                 .orElseThrow(() -> new IllegalArgumentException("해당하는 Topic이 존재하지 않습니다."));
@@ -74,5 +80,4 @@ private List<TopicResponse> sortTopicsByCounts(Map<Topic, Long> topicCounts) {
                 .map(TopicResponse::from)
                 .collect(Collectors.toList());
     }
-
 }