#14 simple blog : add response class

simpleblog/src/main/java/com/example/simpleblog/controller/PostController.java

@@ -2,6 +2,7 @@ package com.example.simpleblog.controller;
 
 import com.example.simpleblog.domain.Post;
 import com.example.simpleblog.request.PostCreate;
+import com.example.simpleblog.response.PostResponse;
 import com.example.simpleblog.service.PostService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -22,7 +23,7 @@ public class PostController {
     }
 
     @GetMapping("/posts/{postId}")
-    public Post getPost(@PathVariable(name = "postId") Long id) {
+    public PostResponse getPost(@PathVariable(name = "postId") Long id) {
         return postService.getPost(id);
     }
 }

simpleblog/src/main/java/com/example/simpleblog/response/PostResponse.java

@@ -0,0 +1,23 @@
+package com.example.simpleblog.response;
+
+import lombok.Builder;
+import lombok.Getter;
+
+/**
+ * 서비스 정책에 맞는 클래스
+ */
+@Getter
+public class PostResponse {
+
+    private final Long id;
+    private final String title;
+    private final String content;
+
+    @Builder
+
+    public PostResponse(Long id, String title, String content) {
+        this.id = id;
+        this.title = title.substring(0 ,Math.min(title.length(), 10));
+        this.content = content;
+    }
+}

simpleblog/src/main/java/com/example/simpleblog/service/PostService.java

@@ -3,6 +3,7 @@ package com.example.simpleblog.service;
 import com.example.simpleblog.domain.Post;
 import com.example.simpleblog.repository.PostRepository;
 import com.example.simpleblog.request.PostCreate;
+import com.example.simpleblog.response.PostResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -24,8 +25,14 @@ public class PostService {
         postRepository.save(post);
     }
 
-    public Post getPost(Long id) {
-        return postRepository.findById(id)
+    public PostResponse getPost(Long id) {
+        Post postEntity = postRepository.findById(id)
                 .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 글입니다."));
+
+        return PostResponse.builder()
+                .id(postEntity.getId())
+                .title(postEntity.getTitle())
+                .content(postEntity.getContent())
+                .build();
     }
 }

simpleblog/src/test/java/com/example/simpleblog/controller/PostControllerTest.java

@@ -114,19 +114,21 @@ class PostControllerTest {
     void get_post_by_id_success() throws Exception {
         // given
         Post post = Post.builder()
-                .title("글 제목입니다.")
+                .title("123456789012345")
                 .content("글 내용입니다.")
                 .build();
 
         postRepository.save(post);
 
+        // json 응답에서 title 값 길이를 최대 10글자
+
         // expected
         mockMvc.perform(get("/posts/{postId}", post.getId())
                         .contentType(APPLICATION_JSON)
                 )
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.id").value(post.getId()))
-                .andExpect(jsonPath("$.title").value("글 제목입니다."))
+                .andExpect(jsonPath("$.title").value("1234567890"))
                 .andExpect(jsonPath("$.content").value("글 내용입니다."))
                 .andDo(print())
         ;

simpleblog/src/test/java/com/example/simpleblog/service/PostServiceTest.java

@@ -3,6 +3,7 @@ package com.example.simpleblog.service;
 import com.example.simpleblog.domain.Post;
 import com.example.simpleblog.repository.PostRepository;
 import com.example.simpleblog.request.PostCreate;
+import com.example.simpleblog.response.PostResponse;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -59,11 +60,11 @@ class PostServiceTest {
         Long postId = 1L;
 
         // when
-        Post postEntity = postService.getPost(postId);
+        PostResponse response = postService.getPost(postId);
 
         // then
         assertNotNull(post);
-        assertEquals("글 제목입니다.", postEntity.getTitle());
-        assertEquals("글 내용입니다.", postEntity.getContent());
+        assertEquals("글 제목입니다.", response.getTitle());
+        assertEquals("글 내용입니다.", response.getContent());
     }
 }