Feat: 게시글 좋아요 서비스 작성

GDG-on-Campus-KNU · Oct 21, 2024 · 4dcbad6 · 4dcbad6
1 parent a85f12d
commit 4dcbad6
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Showing 2 changed files with 31 additions and 0 deletions.
diff --git a/src/main/java/com/gdsc_knu/official_homepage/service/post/PostService.java b/src/main/java/com/gdsc_knu/official_homepage/service/post/PostService.java
@@ -26,4 +26,8 @@ public interface PostService {
     PagingResponse<PostResponse.Main> searchPostList(String keyword, int page, int size);
 
     List<PostResponse.Main> getTrendingPosts(Category category, int size);
+
+    void likePost(Long memberId, Long postId);
+
+    void unlikePost(Long memberId, Long postId);
 }
diff --git a/src/main/java/com/gdsc_knu/official_homepage/service/post/PostServiceImpl.java b/src/main/java/com/gdsc_knu/official_homepage/service/post/PostServiceImpl.java
@@ -7,11 +7,13 @@
 import com.gdsc_knu.official_homepage.entity.Member;
 import com.gdsc_knu.official_homepage.entity.enumeration.Role;
 import com.gdsc_knu.official_homepage.entity.post.Post;
+import com.gdsc_knu.official_homepage.entity.post.PostLike;
 import com.gdsc_knu.official_homepage.entity.post.enumeration.Category;
 import com.gdsc_knu.official_homepage.entity.post.enumeration.PostStatus;
 import com.gdsc_knu.official_homepage.exception.CustomException;
 import com.gdsc_knu.official_homepage.exception.ErrorCode;
 import com.gdsc_knu.official_homepage.repository.MemberRepository;
+import com.gdsc_knu.official_homepage.repository.PostLikeRepository;
 import com.gdsc_knu.official_homepage.repository.PostRepository;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -31,6 +33,7 @@
 public class PostServiceImpl implements PostService {
     private final PostRepository postRepository;
     private final MemberRepository memberRepository;
+    private final PostLikeRepository postLikeRepository;
 
     /**
      * 게시글 작성, 회원만 작성 가능
@@ -142,6 +145,30 @@ public void deletePost(Long memberId, Long postId) {
         postRepository.delete(post);
     }
 
+    @Override
+    public void likePost(Long memberId, Long postId) {
+        postLikeRepository.findByMemberIdAndPostId(memberId, postId)
+                .ifPresent(postLike -> {
+                    throw new CustomException(ErrorCode.POST_ALREADY_LIKED);
+                });
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new CustomException(ErrorCode.POST_NOT_FOUND));
+        Member member = memberRepository.findById(memberId)
+                .orElseThrow(() -> new CustomException(ErrorCode.USER_NOT_FOUND));
+        postLikeRepository.save(PostLike.from(post, member));
+        post.addLikeCount();
+    }
+
+    @Override
+    public void unlikePost(Long memberId, Long postId) {
+        PostLike postLike = postLikeRepository.findByMemberIdAndPostId(memberId, postId)
+                .orElseThrow(() -> new CustomException(ErrorCode.POST_NOT_LIKED));
+        postLikeRepository.delete(postLike);
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new CustomException(ErrorCode.POST_NOT_FOUND));
+        post.subtractLikeCount();
+    }
+
     @Override
     @Transactional(readOnly = true)
     @Cacheable(value = "trending-post", key = "'Is '+#category", unless="#result.size()<5")