feat：完成所有功能

backend/controller/menu.py

@@ -1,5 +1,5 @@
 from core.utils import list_to_tree
-from dbhelper.menu import del_menu, get_tree_menu, insert_menu, put_menu
+from dbhelper.menu import del_menu, get_menu, get_tree_menu, insert_menu, put_menu
 from schemas import MenuIn, MenuRead, Response
 
 
@@ -9,10 +9,16 @@ async def menu_add(data: MenuIn) -> Response[MenuRead]:
 
 async def menu_arr() -> Response:
     menus = await get_tree_menu()
-    return Response(data=list_to_tree(menus))
+    try:
+        data = list_to_tree(menus)
+    except KeyError:
+        return Response(code=400, msg="菜单根节点丢失")
+    return Response(data=data)
 
 
 async def menu_del(pk: int) -> Response:
+    if await get_menu({"pid": pk}) is not None:
+        return Response(code=400, msg="请先删除子节点")
     if await del_menu(pk) == 0:
         return Response(code=400, msg="菜单不存在")
     return Response()

backend/controller/role.py

@@ -26,8 +26,7 @@ async def role_has_menu(rid: int):
     rid: 角色ID
     """
     menus = await get_role_menus(rid)
-    for obj in menus:
-        obj["meta"] = json.loads(obj["meta"]) if obj["meta"] is not None else None
+
     try:
         result = list_to_tree(menus)
     except KeyError: