글 상세 조회 기능 구현 (#6)

BACK/spring-app/src/main/java/com/starchive/springapp/hashtag/service/HashTagService.java

@@ -57,7 +57,6 @@ public List<HashTagDto> findManyByCategory(Long CategoryId) {
     }
 
     public List<HashTagResponse> findManyByPost(Long postId) {
-        //postService.findOne(postId);
 
         return hashTagRepository.findAllByPostId(postId).stream().map(HashTagResponse::from).toList();
     }

BACK/spring-app/src/main/java/com/starchive/springapp/post/controller/PostController.java

@@ -1,6 +1,7 @@
 package com.starchive.springapp.post.controller;
 
 import com.starchive.springapp.post.dto.PostCreateRequest;
+import com.starchive.springapp.post.dto.PostDto;
 import com.starchive.springapp.post.dto.PostListResponse;
 import com.starchive.springapp.post.service.PostService;
 import io.swagger.v3.oas.annotations.Operation;
@@ -9,6 +10,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -41,4 +43,11 @@ public ResponseEntity<?> findPosts(
 
         return ResponseEntity.ok(postListResponse);
     }
+
+    @GetMapping("/post/{postId}")
+    @Operation(summary = "상세조회")
+    public ResponseEntity<PostDto> findPost(@PathVariable("postId") Long postId) {
+        PostDto postDto = postService.findOne(postId);
+        return ResponseEntity.ok(postDto);
+    }
 }

BACK/spring-app/src/main/java/com/starchive/springapp/post/dto/PostDto.java

@@ -28,21 +28,14 @@ public static PostDto of(Post post, List<HashTagResponse> hashTagDtos) {
         postDto.title = post.getTitle();
         postDto.author = post.getAuthor();
         postDto.createdAt = post.getCreateAt();
-        postDto.content = setContent(post.getContent());
+        postDto.content = post.getContent();
 
         postDto.hashTags = hashTagDtos;
 
         return postDto;
 
     }
 
-    private static String setContent(String content) {
-        if (content != null && content.length() > 350) {
-            return content.substring(0, 350);
-        }
-        return content;
-    }
-
     private static List<CategorySimpleDto> setCategoryHier(Category category) {
         List<CategorySimpleDto> categoryHier = new ArrayList<>();
         if (category == null) {
@@ -58,5 +51,4 @@ private static List<CategorySimpleDto> setCategoryHier(Category category) {
         categoryHier.add(categoryDto);
         return categoryHier;
     }
-
 }

BACK/spring-app/src/main/java/com/starchive/springapp/post/dto/PostListResponse.java

@@ -9,9 +9,9 @@ public class PostListResponse {
     private int currentPage;
     private int totalPages;
     private long totalCount;
-    private List<PostDto> posts;
+    private List<PostSimpleDto> posts;
 
-    public static PostListResponse from(Page<PostDto> dtoPage) {
+    public static PostListResponse from(Page<PostSimpleDto> dtoPage) {
         PostListResponse postListResponse = new PostListResponse();
         postListResponse.currentPage = dtoPage.getNumber();
         postListResponse.totalPages = dtoPage.getTotalPages();

BACK/spring-app/src/main/java/com/starchive/springapp/post/dto/PostSimpleDto.java

@@ -0,0 +1,62 @@
+package com.starchive.springapp.post.dto;
+
+import com.starchive.springapp.category.domain.Category;
+import com.starchive.springapp.category.dto.CategorySimpleDto;
+import com.starchive.springapp.hashtag.dto.HashTagResponse;
+import com.starchive.springapp.post.domain.Post;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import lombok.Data;
+
+@Data
+public class PostSimpleDto {
+    private List<CategorySimpleDto> categoryHier;
+    private Long postId;
+    private String title;
+    private String author;
+    private LocalDateTime createdAt;
+    private String content;
+    private List<HashTagResponse> hashTags;
+
+    public static PostSimpleDto of(Post post, List<HashTagResponse> hashTagDtos) {
+        PostSimpleDto postDto = new PostSimpleDto();
+
+        postDto.categoryHier = setCategoryHier(post.getCategory());
+
+        postDto.postId = post.getId();
+        postDto.title = post.getTitle();
+        postDto.author = post.getAuthor();
+        postDto.createdAt = post.getCreateAt();
+        postDto.content = setContent(post.getContent());
+
+        postDto.hashTags = hashTagDtos;
+
+        return postDto;
+
+    }
+
+    private static String setContent(String content) {
+        if (content != null && content.length() > 350) {
+            return content.substring(0, 350);
+        }
+        return content;
+    }
+
+    private static List<CategorySimpleDto> setCategoryHier(Category category) {
+        List<CategorySimpleDto> categoryHier = new ArrayList<>();
+        if (category == null) {
+            return categoryHier;
+        }
+        if (category.getParent() != null) {
+            Category parent = category.getParent();
+            CategorySimpleDto parentCategoryDto = CategorySimpleDto.from(parent);
+            categoryHier.add(parentCategoryDto);
+        }
+
+        CategorySimpleDto categoryDto = CategorySimpleDto.from(category);
+        categoryHier.add(categoryDto);
+        return categoryHier;
+    }
+
+}

BACK/spring-app/src/main/java/com/starchive/springapp/post/service/PostService.java

@@ -9,6 +9,8 @@
 import com.starchive.springapp.post.dto.PostCreateRequest;
 import com.starchive.springapp.post.dto.PostDto;
 import com.starchive.springapp.post.dto.PostListResponse;
+import com.starchive.springapp.post.dto.PostSimpleDto;
+import com.starchive.springapp.post.exception.PostNotFoundException;
 import com.starchive.springapp.post.repository.PostRepository;
 import com.starchive.springapp.posthashtag.domain.PostHashTag;
 import com.starchive.springapp.posthashtag.service.PostHashTagService;
@@ -43,8 +45,12 @@ public void createPost(PostCreateRequest request) {
 
     }
 
-    public Post findOne(Long postId) {
-        return postRepository.findById(postId).orElseThrow();
+    public PostDto findOne(Long postId) {
+        Post post = postRepository.findById(postId).orElseThrow(PostNotFoundException::new);
+
+        List<HashTagResponse> hashTagResponses = hashTagService.findManyByPost(post.getId());
+
+        return PostDto.of(post, hashTagResponses);
     }
 
     //todo: fetch join (양방향 연관관계)
@@ -71,7 +77,7 @@ public PostListResponse findPosts(Long categoryId, Long hashTagId, int pageNum,
 
         Page<Post> posts = postRepository.findManyByCategoryIds(categoryIds, postIds, pageable);
 
-        Page<PostDto> dtoPage = getPostDtos(posts);
+        Page<PostSimpleDto> dtoPage = getPostDtos(posts);
 
         return PostListResponse.from(dtoPage);
     }
@@ -89,10 +95,10 @@ private List<Long> extractCategoryIds(Category category) {
     }
 
 
-    private Page<PostDto> getPostDtos(Page<Post> posts) {
-        Page<PostDto> dtoPage = posts.map(post -> {
+    private Page<PostSimpleDto> getPostDtos(Page<Post> posts) {
+        Page<PostSimpleDto> dtoPage = posts.map(post -> {
             List<HashTagResponse> hashTagDtos = hashTagService.findManyByPost(post.getId());
-            return PostDto.of(post, hashTagDtos);
+            return PostSimpleDto.of(post, hashTagDtos);
         });
         return dtoPage;
     }

BACK/spring-app/src/test/java/com/starchive/springapp/post/service/PostServiceTest.java

@@ -10,10 +10,12 @@
 import com.starchive.springapp.image.repository.PostImageRepository;
 import com.starchive.springapp.post.domain.Post;
 import com.starchive.springapp.post.dto.PostCreateRequest;
+import com.starchive.springapp.post.dto.PostDto;
 import com.starchive.springapp.post.dto.PostListResponse;
 import com.starchive.springapp.post.repository.PostRepository;
 import com.starchive.springapp.posthashtag.domain.PostHashTag;
 import com.starchive.springapp.posthashtag.repository.PostHashTagRepository;
+import jakarta.persistence.EntityManager;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
@@ -43,6 +45,9 @@ class PostServiceTest {
     @Autowired
     PostService postService;
 
+    @Autowired
+    EntityManager em;
+
     @Test
     public void 게시글_작성_통합_테스트() throws Exception {
         //given
@@ -99,4 +104,29 @@ class PostServiceTest {
         assertThat(response.getPosts()).extracting("title").containsExactlyInAnyOrder("title1", "title2");
         assertThat(response.getPosts().get(0).getHashTags()).extracting("name").containsExactly("tag1");
     }
+
+    @Test
+    public void 게시글_상세조회_통합_테스트() throws Exception {
+        //given
+        Category category = new Category("카테고리", null);
+        categoryRepository.save(category);
+
+        Post post1 = new Post(null, "title1", "content", "author1", "123", LocalDateTime.now(), category);
+        postRepository.save(post1);
+        HashTag hashTag = new HashTag("tag1");
+        hashTagRepository.save(hashTag);
+
+        postHashTagRepository.save(new PostHashTag(post1, hashTag));
+
+        em.flush();
+        em.clear();
+        //when
+        PostDto findOne = postService.findOne(post1.getId());
+
+        //then
+        assertThat(findOne.getTitle()).isEqualTo(post1.getTitle());
+
+    }
+
+
 }