From b8f5e5ef918e16aa03e285c7e52c6c049692ebee Mon Sep 17 00:00:00 2001
From: Bibo-Joshi <22366557+Bibo-Joshi@users.noreply.github.com>
Date: Tue, 19 Apr 2022 21:45:43 +0200
Subject: [PATCH] Updated Storing bot, user and chat related data (markdown)

---
 Storing-bot,-user-and-chat-related-data.md | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/Storing-bot,-user-and-chat-related-data.md b/Storing-bot,-user-and-chat-related-data.md
index 503795d..52d623a 100644
--- a/Storing-bot,-user-and-chat-related-data.md
+++ b/Storing-bot,-user-and-chat-related-data.md
@@ -103,11 +103,17 @@ async def my_callback(update, context):
         # Resend to new chat id
         await context.bot.send_message(new_id, text)
 
-        # Transfer data
-        if chat_id in application.chat_data:
-            application.migrate_chat_data(
-                old_chat_id=chat_id,
-                new_chat_id=new_id
-            )
+        # Get old and new chat ids
+        old_id = message.migrate_from_chat_id or message.chat_id
+        new_id = message.migrate_to_chat_id or message.chat_id
+
+        # transfer data, only if old data is still present
+        # this step is important, as Telegram sends *two* updates
+        # about the migration
+        if old_id in application.chat_data:
+        application.migrate_chat_data(
+            old_chat_id=old_id,
+            new_chat_id=new_id
+        )
     ...
 ```