细化项目评论Service的注解

src/main/java/cn/meteor/beyondclouds/modules/project/service/impl/ProjectCommentServiceImpl.java

@@ -115,20 +115,26 @@ public class ProjectCommentServiceImpl extends ServiceImpl<ProjectCommentMapper,
 
         IPage<ProjectComment> page = new Page<>(pageNumber, pageSize);
 
-        // 如果parentId为null，则只获取一级评论
+        // 1.如果parentId为null，则只获取一级评论
         if (null == parentId) {
             QueryWrapper<ProjectComment> projectCommentQueryWrapper = new QueryWrapper<>();
             projectCommentQueryWrapper.eq("project_id", projectId);
+
+            // 只获取一级评论，也就是depth为0
             projectCommentQueryWrapper.eq("depth", 0);
             projectCommentQueryWrapper.orderByDesc("create_time");
             return page(page, projectCommentQueryWrapper);
         }
 
-        // 如果parentId不为null，则获取其子评论
-        ProjectComment projectComment = getById(parentId);
-        if (null == projectComment) {
+        // 1.如果parentId不为null，则获取其子评论
+
+        // 判断父评论是否存在，不存在则抛出异常
+        ProjectComment parentComment = getById(parentId);
+        if (null == parentComment) {
             throw new ProjectCommentServiceException(ProjectCommentErrorCode.COMMENT_NOT_FOUND);
         }
+
+        // 查询子评论
         QueryWrapper<ProjectComment> projectCommentQueryWrapper = new QueryWrapper<>();
         projectCommentQueryWrapper.eq("parent_id", parentId);
         return page(page, projectCommentQueryWrapper);