댓글 기능 추가

Author: DevCHW

src/main/kotlin/io/devchw/coderabbit/BoardController.kt

@@ -11,14 +11,17 @@ import org.springframework.web.bind.annotation.RequestBody
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
 import java.util.concurrent.atomic.AtomicLong
+import org.springframework.beans.factory.annotation.Autowired
 
 /**
  * @author DevCHW
  * @since 2025-06-05
  */
 @RestController
 @RequestMapping("/api/board")
-class BoardController {
+class BoardController(
+    @Autowired private val commentController: CommentController
+) {
 
     private val posts = mutableMapOf<Long, Post>()
     private val idGenerator = AtomicLong(1)
@@ -98,6 +101,10 @@ class BoardController {
         if (!posts.containsKey(id)) {
             return ResponseEntity.status(HttpStatus.NOT_FOUND).build()
         }
+
+        // 게시물과 관련된 모든 댓글 삭제
+        commentController.deleteAllCommentsForPost(id)
+
         posts.remove(id)
         return ResponseEntity.status(HttpStatus.NO_CONTENT).build()
     }

src/main/kotlin/io/devchw/coderabbit/Comment.kt

@@ -0,0 +1,11 @@
+package io.devchw.coderabbit
+
+/**
+ * @author DevCHW
+ * @since 2025-06-05
+ */
+data class Comment(
+    var id: Long? = null,
+    var postId: Long,
+    var content: String
+)

src/main/kotlin/io/devchw/coderabbit/CommentController.kt

@@ -0,0 +1,86 @@
+package io.devchw.coderabbit
+
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.*
+import java.util.concurrent.atomic.AtomicLong
+
+/**
+ * @author DevCHW
+ * @since 2025-06-05
+ */
+@RestController
+@RequestMapping("/api/board")
+class CommentController {
+
+    private val comments = mutableMapOf<Long, Comment>()
+    private val idGenerator = AtomicLong(1)
+
+    // 댓글 생성
+    @PostMapping("/{postId}/comments")
+    fun createComment(
+        @PathVariable postId: Long, 
+        @RequestBody comment: Comment
+    ): ResponseEntity<Comment> {
+        val id = idGenerator.getAndIncrement()
+        comment.id = id
+        comment.postId = postId
+        comments[id] = comment
+        return ResponseEntity.status(HttpStatus.CREATED).body(comment)
+    }
+
+    // 게시물의 모든 댓글 조회
+    @GetMapping("/{postId}/comments")
+    fun getCommentsByPost(@PathVariable postId: Long): ResponseEntity<List<Comment>> {
+        val postComments = comments.values.filter { it.postId == postId }
+        return ResponseEntity.ok(postComments)
+    }
+
+    // 댓글 상세 조회
+    @GetMapping("/comments/{commentId}")
+    fun getComment(@PathVariable commentId: Long): ResponseEntity<Comment> {
+        val comment = comments[commentId]
+        return if (comment != null) {
+            ResponseEntity.ok(comment)
+        } else {
+            ResponseEntity.status(HttpStatus.NOT_FOUND).build()
+        }
+    }
+
+    // 댓글 수정
+    @PutMapping("/comments/{commentId}")
+    fun updateComment(
+        @PathVariable commentId: Long, 
+        @RequestBody updatedComment: Comment
+    ): ResponseEntity<Comment> {
+        val existingComment = comments[commentId]
+        if (existingComment == null) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).build()
+        }
+
+        // 기존 postId 유지
+        updatedComment.id = commentId
+        updatedComment.postId = existingComment.postId
+        comments[commentId] = updatedComment
+        return ResponseEntity.ok(updatedComment)
+    }
+
+    // 댓글 삭제
+    @DeleteMapping("/comments/{commentId}")
+    fun deleteComment(@PathVariable commentId: Long): ResponseEntity<Void> {
+        if (!comments.containsKey(commentId)) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).build()
+        }
+        comments.remove(commentId)
+        return ResponseEntity.status(HttpStatus.NO_CONTENT).build()
+    }
+
+    // 게시물의 모든 댓글 삭제 (게시물이 삭제될 때 호출)
+    fun deleteAllCommentsForPost(postId: Long) {
+        val commentIdsToRemove = comments.values
+            .filter { it.postId == postId }
+            .mapNotNull { it.id }
+
+        commentIdsToRemove.forEach { comments.remove(it) }
+    }
+}

src/main/kotlin/io/devchw/coderabbit/Post.kt

@@ -7,5 +7,6 @@ package io.devchw.coderabbit
 data class Post(
     var id: Long? = null,
     var title: String,
-    var content: String
+    var content: String,
+    var comments: MutableList<Comment> = mutableListOf()
 )