fix

cooleshow-user/user-biz/src/main/java/com/yonge/cooleshow/biz/dal/service/impl/VideoLessonGroupServiceImpl.java

@@ -272,6 +272,7 @@ public class VideoLessonGroupServiceImpl extends ServiceImpl<VideoLessonGroupDao
             // 需要修改的关联数据
             List<CourseMusicAlbumRelationDto> relationList = videoLessonGroupDetailDto.getRelationList();
 
+            videoLessonGroupDetailDto.setCourseRelationMusicAlbumList(new ArrayList<>());
             // 原本的关联数据
             List<CourseRelationMusicAlbum> oldRelationList = courseRelationMusicAlbumList.get(
                     videoLessonGroupDetailDto.getId());
@@ -305,9 +306,6 @@ public class VideoLessonGroupServiceImpl extends ServiceImpl<VideoLessonGroupDao
                 } else {
                     updateCourseRelationMusicAlbums.add(courseRelationMusicAlbum);
                 }
-                if (CollectionUtils.isEmpty(videoLessonGroupDetailDto.getCourseRelationMusicAlbumList())) {
-                    videoLessonGroupDetailDto.setCourseRelationMusicAlbumList(new ArrayList<>());
-                }
                 videoLessonGroupDetailDto.getCourseRelationMusicAlbumList().add(courseRelationMusicAlbum);
             }
         }