v2.0.1更新

backend/models/subject.py

@@ -69,6 +69,13 @@ class SubjectModel:
         result = await execute_update(sql, tuple(params))
         return result > 0
     
+    @staticmethod
+    async def has_related_data(subject_id: int) -> bool:
+        """检查科目是否有关联数据（assignments表）"""
+        sql = "SELECT COUNT(*) as cnt FROM assignments WHERE subject_id = %s"
+        result = await execute_one(sql, (subject_id,))
+        return result['cnt'] > 0
+    
     @staticmethod
     async def delete(subject_id: int) -> bool:
         sql = "UPDATE subjects SET is_active = 0 WHERE subject_id = %s"