调整数据库表的单复数

app/Http/Controllers/System/Admin/City.php

@@ -130,9 +130,9 @@ class City extends Controller
         ]);
     }
 
-    public function children(int $parentId)
+    public function children(string $parentCode)
     {
-        $children = $this->cityService->getChildren($parentId);
+        $children = $this->cityService->getChildren($parentCode);
         return response()->json([
             'code' => 200,
             'message' => 'success',