GitHub user dosubot[bot] added a comment to the discussion: when i use my
custom superset_config.py,there is an error like this,how to fix it ?
<!-- Answer -->
You can automate session cleanup in Superset so users don't have to clear their
browser cache after a user is deleted. In your superset_config.py, use the
FLASK_APP_MUTATOR hook to add a before_request handler that checks if the
current user still exists and logs them out if not. This will clear the session
server-side whenever a deleted user tries to make a request, preventing the
"NoneType object has no attribute 'is_active'" error.
Here's an example:
```python
from flask import g
from flask_login import logout_user, current_user
from superset.extensions import db
from superset.models.core import User
def logout_if_user_deleted():
if current_user.is_authenticated:
# Check if user still exists in the DB
user = db.session.query(User).get(current_user.get_id())
if user is None or not user.is_active:
logout_user()
def FLASK_APP_MUTATOR(app):
app.before_request(logout_if_user_deleted)
```
Add this to your superset_config.py. Now, if a deleted user tries to use their
session, Superset will log them out automatically and redirect them to the
login page, no manual cache clearing needed. This is the recommended pattern
for handling deleted user sessions in Superset
[[docs](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/docs/docs/configuration/configuring-superset.mdx)].
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GitHub link:
https://github.com/apache/superset/discussions/32808#discussioncomment-13971782
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