删除课程总目标时的判断

src/main/java/com/teaching/backend/common/ErrorCode.java

@@ -22,7 +22,8 @@ public enum ErrorCode {
     INVALID_ROLE(400010, "角色不存在"),
     MESSAGE_NO_READ(400011, "消息未读，禁止删除！"),
     MESSAGE_NO_EXIT(400012, "消息不存在！"),
-    CONTENT_HAS_NO_KNOWS(400013, "该课程目标暂未关联知识点！"),
+
+    TOTOAL_OBJECTIVE_CANT_DELETE(400013, "课程总目标内容禁止删除！"),
 
     NOT_LOGIN_ERROR(40100, "未登录"),
     NO_AUTH_ERROR(40101, "无权限"),

src/main/java/com/teaching/backend/service/impl/courses/ObjectiveContentsServiceImpl.java

@@ -48,6 +48,11 @@ public class ObjectiveContentsServiceImpl extends ServiceImpl<ObjectiveContentsM
         if(count > CourseCode.KNOWS_EXIT.getValue()){
             throw new BusinessException(ErrorCode.KNOWS_EXIT);
         }
+        String objectiveId = objectiveContentsMapper.selectById(id).getObjectiveId();
+        Integer type = courseObjectivesMapper.selectById(objectiveId).getType();
+        if (type == TOTAL_OBJECTIVE_TYPE.getValue()){
+            throw new BusinessException(ErrorCode.TOTOAL_OBJECTIVE_CANT_DELETE);
+        }
         int delete = objectiveContentsMapper.deleteById(id);
         return delete > 0 ? "删除成功！" : "删除失败！";
     }