diff --git a/models/discount_promo_code.json b/models/discount_promo_code.json
index 37270f4..d7c6b15 100644
--- a/models/discount_promo_code.json
+++ b/models/discount_promo_code.json
@@ -32,8 +32,7 @@
             "name": "sale_id",
             "title": "生成销售id",
             "type": "str",
-            "length": 32,
-            "nullable": "no"
+            "length": 32
         },
         {
             "name": "code_type",