增加乐器采购清单确认接口

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

@@ -831,7 +831,7 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
         Date date = new Date();
         String musicGroupId = classGroup4MixDto.getMusicGroupId();
         MusicGroup musicGroup = musicGroupDao.get(musicGroupId);
-        if (musicGroup != null) {
+        if (musicGroup == null) {
             throw new Exception("乐团不存在");
         }
         Integer schoolId = musicGroup.getSchoolId();
@@ -1037,7 +1037,7 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
         Date date = new Date();
         String musicGroupId = classGroup4MixDto.getMusicGroupId();
         MusicGroup musicGroup = musicGroupDao.get(musicGroupId);
-        if (musicGroup != null) {
+        if (musicGroup == null) {
             throw new Exception("乐团不存在");
         }
         ClassGroup classgroup = classGroupDao.get(classGroup4MixDto.getClassGroupId());
@@ -1249,7 +1249,7 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
         Date date = new Date();
         String musicGroupId = classGroup4MixDto.getMusicGroupId();
         MusicGroup musicGroup = musicGroupDao.get(musicGroupId);
-        if (musicGroup != null) {
+        if (musicGroup == null) {
             throw new Exception("乐团不存在");
         }
         Integer schoolId = musicGroup.getSchoolId();