Feature/1 comment api & Bug Fix

.gradle/buildOutputCleanup/cache.properties

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+#Tue Aug 26 15:38:41 KST 2025
+gradle.version=8.14.3

HELP.md

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+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Gradle documentation](https://docs.gradle.org)
+* [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/3.5.5/gradle-plugin)
+* [Create an OCI image](https://docs.spring.io/spring-boot/3.5.5/gradle-plugin/packaging-oci-image.html)
+* [Spring Boot Testcontainers support](https://docs.spring.io/spring-boot/3.5.5/reference/testing/testcontainers.html#testing.testcontainers)
+* [Testcontainers MySQL Module Reference Guide](https://java.testcontainers.org/modules/databases/mysql/)
+* [Spring Web](https://docs.spring.io/spring-boot/3.5.5/reference/web/servlet.html)
+* [Validation](https://docs.spring.io/spring-boot/3.5.5/reference/io/validation.html)
+* [Spring Security](https://docs.spring.io/spring-boot/3.5.5/reference/web/spring-security.html)
+* [Spring Data JPA](https://docs.spring.io/spring-boot/3.5.5/reference/data/sql.html#data.sql.jpa-and-spring-data)
+* [Flyway Migration](https://docs.spring.io/spring-boot/3.5.5/how-to/data-initialization.html#howto.data-initialization.migration-tool.flyway)
+* [Spring Boot Actuator](https://docs.spring.io/spring-boot/3.5.5/reference/actuator/index.html)
+* [Testcontainers](https://java.testcontainers.org/)
+
+### Guides
+The following guides illustrate how to use some features concretely:
+
+* [Building a RESTful Web Service](https://spring.io/guides/gs/rest-service/)
+* [Serving Web Content with Spring MVC](https://spring.io/guides/gs/serving-web-content/)
+* [Building REST services with Spring](https://spring.io/guides/tutorials/rest/)
+* [Validation](https://spring.io/guides/gs/validating-form-input/)
+* [Securing a Web Application](https://spring.io/guides/gs/securing-web/)
+* [Spring Boot and OAuth2](https://spring.io/guides/tutorials/spring-boot-oauth2/)
+* [Authenticating a User with LDAP](https://spring.io/guides/gs/authenticating-ldap/)
+* [Accessing Data with JPA](https://spring.io/guides/gs/accessing-data-jpa/)
+* [Building a RESTful Web Service with Spring Boot Actuator](https://spring.io/guides/gs/actuator-service/)
+* [Accessing data with MySQL](https://spring.io/guides/gs/accessing-data-mysql/)
+
+### Additional Links
+These additional references should also help you:
+
+* [Gradle Build Scans – insights for your project's build](https://scans.gradle.com#gradle)
+
+### Testcontainers support
+
+This project uses [Testcontainers at development time](https://docs.spring.io/spring-boot/3.5.5/reference/features/dev-services.html#features.dev-services.testcontainers).
+
+Testcontainers has been configured to use the following Docker images:
+
+* [`mysql:latest`](https://hub.docker.com/_/mysql)
+
+Please review the tags of the used images and set them to the same as you're running in production.
+

src/main/java/com/issueDive/controller/CommentController.java

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+package com.issueDive.controller;
+
+import com.issueDive.dto.*;
+import com.issueDive.service.CommentService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/issues/{issueId}/comments")
+public class CommentController {
+    private final CommentService commentService;
+
+    @GetMapping
+    public ResponseEntity<ApiResponse<List<CommentResponse>>> getComment(@PathVariable Long issueId){
+        List<CommentResponse> tree = commentService.getTreeByIssue(issueId);
+        return ResponseEntity.ok(ApiResponse.ok(tree));
+    }
+
+    @PostMapping
+    public ResponseEntity<ApiResponse<CommentResponse>> createComment(@PathVariable Long issueId, @RequestBody @Valid CreateCommentRequest request
+                                                        ,@RequestHeader("X-USER-ID") Long userId){
+
+        CommentResponse created = commentService.createComment(issueId, request, userId);
+        return ResponseEntity.status(HttpStatus.CREATED).body(ApiResponse.ok(created));
+    }
+
+    @PatchMapping("/{commentId}")
+    public ResponseEntity<ApiResponse<CommentResponse>> updateComment(@PathVariable Long issueId, @PathVariable Long commentId, @RequestBody @Valid UpdateCommentRequest request, @RequestHeader("X-USER-ID") Long userId){
+        CommentResponse updated = commentService.updateComment(issueId, commentId, request, userId);
+        return ResponseEntity.ok(ApiResponse.ok(updated));
+    }
+
+    @DeleteMapping("/{commentId}")
+    public ResponseEntity<?> deleteComment(@PathVariable Long issueId, @PathVariable Long commentId, @RequestHeader("X-USER-ID") Long userId){
+        commentService.deleteComment(issueId, commentId, userId);
+        return ResponseEntity.noContent().build();
+    }
+
+    @GetMapping("/count")
+    public  ResponseEntity<ApiResponse<CountCommentResponse>> countComment(@PathVariable Long issueId){
+        CountCommentResponse response = commentService.countByIssue(issueId);
+        return ResponseEntity.ok(ApiResponse.ok(response));
+    }
+}

src/main/java/com/issueDive/dto/CommentResponse.java

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+package com.issueDive.dto;
+
+import com.issueDive.entity.Comment;
+import lombok.*;
+
+import java.time.LocalDateTime;
+import java.util.*;
+
+@Getter
+@Setter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class CommentResponse {
+
+    private Long id;
+    private Long issueId;
+    private Long userId;
+    private String author;
+    private String description;
+    private Long parentId;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    @Builder.Default
+    private List<CommentResponse> children = new ArrayList<>();
+
+    // 방어적 추가 헬퍼
+    public void addChild(CommentResponse child) {
+        if (children == null) children = new ArrayList<>();
+        children.add(child);
+    }
+
+    // 널-세이프 getter
+    public List<CommentResponse> getChildren() {
+        if (children == null) children = new ArrayList<>();
+        return children;
+    }
+
+    public static CommentResponse from(Comment comment){
+        return CommentResponse.builder()
+                .id(comment.getId())
+                .issueId(comment.getIssue().getId())
+                .userId(comment.getUser().getId())
+                .author(comment.getUser().getUsername())
+                .description(comment.getDescription())
+                .parentId(comment.getParent() != null ? comment.getParent().getId() : null)
+                .createdAt(comment.getCreatedAt())
+                .updatedAt(comment.getUpdatedAt())
+                .build();
+    }
+
+    public static List<CommentResponse> fromAllToTree(List<Comment> comments){
+        Map<Long, CommentResponse> map = new LinkedHashMap<>();
+        List<CommentResponse> roots = new ArrayList<>();
+
+        // 1) 엔티티 → DTO 변환 & 인덱싱
+        for (Comment c : comments) {
+            map.put(c.getId(), from(c));
+        }
+
+        // 2) 부모-자식 연결
+        for (Comment c : comments) {
+            Long pId = (c.getParent() != null) ? c.getParent().getId() : null;
+            CommentResponse dto = map.get(c.getId());
+
+            if (pId == null) {
+                roots.add(dto);
+            } else {
+                CommentResponse parent = map.get(pId);
+                if (parent != null) {
+                    parent.addChild(dto);
+                } else {
+                    // 부모 누락 방어: 루트에 승격(정책에 맞게 조정 가능)
+                    roots.add(dto);
+                }
+            }
+        }
+        return roots;
+    }
+}

src/main/java/com/issueDive/dto/CountCommentResponse.java

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+package com.issueDive.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class CountCommentResponse {
+    private Long issueId;
+    private Long count;
+}

src/main/java/com/issueDive/dto/CreateCommentRequest.java

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+package com.issueDive.dto;
+import jakarta.validation.constraints.NotBlank;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class CreateCommentRequest {
+    @NotBlank
+    private String description;
+    private Long parentId;
+}

src/main/java/com/issueDive/dto/UpdateCommentRequest.java

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+package com.issueDive.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class UpdateCommentRequest {
+
+    @NotBlank
+    private String description;
+}

src/main/java/com/issueDive/entity/Comment.java

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+package com.issueDive.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Table(name = "comments")
+@Getter
+@Setter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Builder
+public class Comment {
+
+        @Id
+        @GeneratedValue(strategy = GenerationType.IDENTITY)
+        private Long id;
+
+        @ManyToOne(fetch = FetchType.LAZY)
+        @JoinColumn(name = "issue_id", nullable = false)
+        private Issue issue;
+
+        @ManyToOne(fetch = FetchType.LAZY)
+        @JoinColumn(name = "user_id", nullable = false)
+        private User user;
+
+        @Lob
+        @Column(nullable = false)
+        private String description;
+
+        @ManyToOne(fetch = FetchType.LAZY)
+        @JoinColumn(name = "parent_id")
+        private Comment parent;
+
+        @Builder.Default
+        @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
+        private List<Comment> children = new ArrayList<>();
+
+        @Column(name = "created_at", updatable = false, insertable = false,
+                columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
+        private LocalDateTime createdAt;
+
+        @Column(name = "updated_at", insertable = false,
+                columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")
+        private LocalDateTime updatedAt;
+
+        public void changeDescription(String description) { this.description = description; }
+}

src/main/java/com/issueDive/exception/CommentNotFoundException.java

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+package com.issueDive.exception;
+
+public class CommentNotFoundException extends RuntimeException{
+
+    public CommentNotFoundException(String message) {
+        super(message);
+    }
+
+    public CommentNotFoundException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/com/issueDive/exception/ErrorCode.java

@@ -1,7 +1,7 @@
 package com.issueDive.exception;
 
 public enum ErrorCode {
-    ValidationError, InvalidQueryParam, Unauthorized, Forbidden, InternalServerError,
+    ValidationError, InvalidQueryParam, Unauthorized, Forbidden, BadRequest, InternalServerError,
     IssueNotFound, InvalidStatus,
 
     LabelNotFound, IssueLabelNotFound, DuplicateLabel,

src/main/java/com/issueDive/exception/GlobalExceptionHandler.java

@@ -47,15 +47,40 @@ public ResponseEntity<ErrorResponse> handleBaseException(BaseException ex) {
                 .body(ErrorResponse.of(ex.getErrorCode(), ex.getMessage()));
     }
 
+    @ExceptionHandler(CommentNotFoundException.class)
+    public ResponseEntity<ErrorResponse> handleCommentNotFound(CommentNotFoundException e) {
+        return ResponseEntity.status(HttpStatus.NOT_FOUND)
+                .body(ErrorResponse.of(ErrorCode.CommentNotFound, e.getMessage()));
+    }
+
+    @ExceptionHandler(UserNotFoundException.class)
+    public ResponseEntity<ErrorResponse> handleUserNotFound(UserNotFoundException e) {
+        return ResponseEntity.status(HttpStatus.NOT_FOUND)
+                .body(ErrorResponse.of(ErrorCode.UserNotFound, e.getMessage()));
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ResponseEntity<ErrorResponse> handleBadRequest(IllegalArgumentException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                .body(ErrorResponse.of(ErrorCode.BadRequest, e.getMessage()));
+    }
+
+    @ExceptionHandler(SecurityException.class)
+    public ResponseEntity<ErrorResponse> handleForbidden(SecurityException e) {
+        return ResponseEntity.status(HttpStatus.FORBIDDEN)
+                .body(ErrorResponse.of(ErrorCode.Forbidden, e.getMessage()));
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ErrorResponse> handleMethodArgumentNotValid(MethodArgumentNotValidException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                .body(ErrorResponse.of(ErrorCode.BadRequest, e.getMessage()));
+    }
+
     @ExceptionHandler(IssueLabelNotFoundException.class)
     public ResponseEntity<ErrorResponse> handleIssueLabelNotFound(IssueLabelNotFoundException e) {
         return ResponseEntity.status(HttpStatus.NOT_FOUND)
                 .body(ErrorResponse.of(ErrorCode.IssueLabelNotFound, e.getMessage()));
     }
 
-    @ExceptionHandler(MethodArgumentNotValidException.class)
-    public ResponseEntity<ErrorResponse> handleValidationException(MethodArgumentNotValidException ex) {
-        return ResponseEntity.badRequest()
-                .body(ErrorResponse.of(ErrorCode.ValidationError, "입력 값이 올바르지 않습니다."));
-    }
 }

src/main/java/com/issueDive/repository/CommentRepository.java

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+package com.issueDive.repository;
+import com.issueDive.entity.Comment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface CommentRepository extends JpaRepository<Comment, Long> {
+
+    @Query("SELECT c FROM Comment c JOIN FETCH c.user WHERE c.issue.id = :issueId")
+    List<Comment> findAllByIssueIdWithUser(@Param("issueId") Long issueId);
+
+    long countByIssueId(Long issueId);
+
+
+}