第一次修改

src/main/java/com/teaching/backend/service/impl/chapter/ChapterServiceImpl.java

@@ -154,10 +154,10 @@ public class ChapterServiceImpl extends ServiceImpl<ChapterMapper, Chapter> impl
 
     @Override
     public List<Chapter> getChapterTree(String courseId) {
-        System.out.println(courseId);
+
 
             List<Chapter> chapters=baseMapper.selectSectionsByCourseId(courseId);
-        System.out.println(chapters);
+
             Map<String,Chapter> chapterMap=new HashMap<>();
 
             List<Chapter> roots=new ArrayList<>();
@@ -167,13 +167,11 @@ public class ChapterServiceImpl extends ServiceImpl<ChapterMapper, Chapter> impl
                 chapter.setChildren(new ArrayList<>());
 
                 chapterMap.put(chapter.getId(),chapter);
-
             }
-        System.out.println(chapterMap);
-
             for (Chapter chapter:chapters){
                 String parentId=chapter.getPid();
-                if (parentId!=null){
+
+                if (!parentId.equals("0")){
                     Chapter parentChapter=chapterMap.get(parentId);
                     if (parentChapter != null) {
                         parentChapter.getChildren().add(chapter);
@@ -183,7 +181,7 @@ public class ChapterServiceImpl extends ServiceImpl<ChapterMapper, Chapter> impl
                     roots.add(chapter);
                 }
             }
-        System.out.println(roots);
+
             return roots;
         }