v2.0.1更新

backend/services/subject_service.py

@@ -68,6 +68,11 @@ class SubjectService:
     @staticmethod
     async def delete_subject(subject_id: int) -> Dict[str, Any]:
         """删除科目（软删除）"""
+        # 检查科目是否有关联数据
+        has_data = await SubjectModel.has_related_data(subject_id)
+        if has_data:
+            return {"success": False, "message": "该科目下已有作业数据，无法删除"}
+        
         result = await SubjectModel.delete(subject_id)
         
         if result: