From 2ba67ab04acae87915e9e9b2b5bf8dfac0d02db0 Mon Sep 17 00:00:00 2001
From: m-xim <maxim_k76@list.ru>
Date: Sun, 26 May 2024 04:18:33 +0300
Subject: [PATCH] Update callback_data.py

Allows using a default value in the class which is equal to an empty string ("").

Example:
class MyCallbackData(CallbackData, prefix="MyCallbackData"):
    input1: str
    input2: str = ""
---
 aiogram/filters/callback_data.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aiogram/filters/callback_data.py b/aiogram/filters/callback_data.py
index 17ccffbf..50e9879a 100644
--- a/aiogram/filters/callback_data.py
+++ b/aiogram/filters/callback_data.py
@@ -131,7 +131,7 @@ class CallbackData(BaseModel):
         for k, v in zip(names, parts):  # type: str, Optional[str]
             if field := cls.model_fields.get(k):
                 if v == "" and _check_field_is_nullable(field):
-                    v = None
+                    v = field.default
             payload[k] = v
         return cls(**payload)