dosubot[bot] commented on issue #34575:
URL: https://github.com/apache/superset/issues/34575#issuecomment-3159813587
<!-- Answer -->
This is a breaking change in Superset 5.0.0: customizing the main IndexView
using `FAB_INDEX_VIEW` in `superset_config.py` is no longer supported. Superset
now ignores this setting, which is why you see the "attribute not found"
error—even if your class is defined correctly. The new, supported way is to use
`FLASK_APP_MUTATOR` to programmatically set `appbuilder.indexview` before views
are registered.
To migrate, define your custom IndexView class as before, then add a
`mutate_app` function and assign it to `FLASK_APP_MUTATOR`:
```python
from flask_appbuilder import expose, IndexView
from superset.typing import FlaskResponse
class SupersetDashboardIndexView(IndexView):
@expose("/")
def index(self) -> FlaskResponse:
session.pop('_flashes', None)
return redirect("/dashboard/list/")
def mutate_app(app):
from superset.extensions import appbuilder
appbuilder.indexview = SupersetDashboardIndexView
FLASK_APP_MUTATOR = mutate_app
```
Remove any `FAB_INDEX_VIEW` setting from your config. Make sure your config
file is loaded (check logs for "Loaded your LOCAL configuration at [...]") and
that your `mutate_app` function runs at startup. If you're using Docker, ensure
your config file is in the correct location (e.g.,
`./docker/pythonpath_dev/superset_config_docker.py`) and restart your
containers. More details and troubleshooting tips are available in [this
discussion](https://github.com/apache/superset/issues/34441) and [this
thread](https://github.com/apache/superset/discussions/34530).
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