bug

mec-biz/src/main/java/com/ym/mec/biz/service/impl/ClassGroupServiceImpl.java

@@ -2379,6 +2379,10 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
         if (Objects.nonNull(classGroup4MixDtos.get(0).getCourseAddType()) && classGroup4MixDtos.get(0).getCourseAddType().equals("onlyUpdateTeacher")) {
             List<ClassGroupTeacherMapper> byClassGroup = classGroupTeacherMapperDao.findByClassGroup(classGroupId);
             List<ClassGroupTeacherMapper> newTeacherMapperList = classGroup4MixDtos.get(0).getClassGroupTeacherMapperList();
+            Set<Integer> collect = newTeacherMapperList.stream().map(e -> e.getUserId()).collect(Collectors.toSet());
+            if(newTeacherMapperList.size() != collect.size()){
+                throw new BizException("主教与助教存在冲突");
+            }
             if(musicGroup.getStatus() == PROGRESS){
                 if (byClassGroup != null && byClassGroup.size() > 0) {
                     ClassGroupTeacherMapper groupTeacherMapper = byClassGroup.stream().filter(classGroupTeacherMapper -> classGroupTeacherMapper.getTeacherRole() == TeachTypeEnum.BISHOP).findFirst().get();