修复bug,添加备案号悬挂功能

backend/middleware/permission.py

@@ -82,6 +82,15 @@ class PermissionChecker:
         role = await PermissionChecker.get_user_role(user_id)
         return role in ["班主任", "学习委员"]
     
+    @staticmethod
+    async def get_user_class_id(user_id: int) -> Optional[int]:
+        """
+        获取用户关联的班级ID
+        单班级系统，固定返回1
+        """
+        # 本系统为单班级设计，class_id 固定为 1
+        return 1
+    
     @staticmethod
     async def check_can_revoke(user_id: int, record_id: int) -> bool:
         """

backend/services/student_service.py

@@ -122,21 +122,12 @@ class StudentService:
         class_id: Optional[int] = None,
         limit: int = 50
     ) -> Dict[str, Any]:
-        """获取排行榜"""
-        # 如果未指定班级，获取用户所在班级
-        if not class_id:
-            user = await StudentModel.get_by_id(user_id) if user_id else None
-            if user:
-                class_id = user["class_id"]
-            else:
-                admin_class = await PermissionChecker.get_user_class_id(user_id)
-                if admin_class:
-                    class_id = admin_class
-        
-        ranking = await StudentModel.get_ranking(class_id=class_id, limit=limit)
+        """获取排行榜（单班级系统）"""
+        # 单班级系统，直接获取排行榜
+        ranking = await StudentModel.get_ranking(limit=limit)
         
         return {
-            "class_id": class_id,
+            "class_id": class_id or 1,
             "ranking": ranking
         }