Feat: Post thumbnailUrl 필드 추가

Author: joyewon0705

src/main/java/com/back/domain/board/post/dto/PostListResponse.java

@@ -16,19 +16,22 @@ public class PostListResponse {
     private final Long postId;
     private final AuthorResponse author;
     private final String title;
+    private final String thumbnailUrl;
+
+    @Setter
+    private List<CategoryResponse> categories;
+
     private final long likeCount;
     private final long bookmarkCount;
     private final long commentCount;
     private final LocalDateTime createdAt;
     private final LocalDateTime updatedAt;
 
-    @Setter
-    private List<CategoryResponse> categories;
-
     @QueryProjection
     public PostListResponse(Long postId,
                             AuthorResponse author,
                             String title,
+                            String thumbnailUrl,
                             List<CategoryResponse> categories,
                             long likeCount,
                             long bookmarkCount,
@@ -38,6 +41,7 @@ public PostListResponse(Long postId,
         this.postId = postId;
         this.author = author;
         this.title = title;
+        this.thumbnailUrl = thumbnailUrl;
         this.categories = categories;
         this.likeCount = likeCount;
         this.bookmarkCount = bookmarkCount;

src/main/java/com/back/domain/board/post/dto/PostRequest.java

@@ -9,10 +9,12 @@
  *
  * @param title         게시글 제목
  * @param content       게시글 내용
+ * @param thumbnailUrl  썸네일 URL
  * @param categoryIds   카테고리 ID 리스트
  */
 public record PostRequest(
         @NotBlank String title,
         @NotBlank String content,
+        String thumbnailUrl,
         List<Long> categoryIds
 ) {}

src/main/java/com/back/domain/board/post/entity/Post.java

@@ -9,6 +9,8 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 @Entity
 @Getter
@@ -22,6 +24,9 @@ public class Post extends BaseEntity {
 
     private String content;
 
+    @Column(length = 500)
+    private String thumbnailUrl;
+
     // TODO: 추후 PostRepositoryImpl#searchPosts 로직 개선 필요, ERD에도 반영할 것
     @Column(nullable = false)
     private Long likeCount = 0L;
@@ -49,6 +54,14 @@ public Post(User user, String title, String content) {
         this.user = user;
         this.title = title;
         this.content = content;
+        this.thumbnailUrl = null;
+    }
+
+    public Post(User user, String title, String content, String thumbnailUrl) {
+        this.user = user;
+        this.title = title;
+        this.content = content;
+        this.thumbnailUrl = thumbnailUrl;
     }
 
     // -------------------- 비즈니스 메서드 --------------------

src/main/java/com/back/domain/board/post/repository/PostRepositoryImpl.java

@@ -162,6 +162,7 @@ private List<PostListResponse> fetchPosts(BooleanBuilder where, List<OrderSpecif
                         post.id,
                         new QAuthorResponse(user.id, profile.nickname, profile.profileImageUrl), // 작성자 정보 (N+1 방지 join)
                         post.title,
+                        post.thumbnailUrl,
                         Expressions.constant(Collections.emptyList()), // categories는 별도 주입
                         likeCount,
                         bookmarkCount,

src/main/java/com/back/domain/board/post/service/PostService.java

@@ -47,7 +47,7 @@ public PostResponse createPost(PostRequest request, Long userId) {
                 .orElseThrow(() -> new CustomException(ErrorCode.USER_NOT_FOUND));
 
         // Post 생성
-        Post post = new Post(user, request.title(), request.content());
+        Post post = new Post(user, request.title(), request.content(), request.thumbnailUrl());
 
         // Category 매핑
         if (request.categoryIds() != null) {