dosubot[bot] commented on issue #20455:
URL: https://github.com/apache/superset/issues/20455#issuecomment-3496916202
<!-- Answer -->
The error happens because the uri object is immutable—it's a SQLAlchemy URL,
so you can't set attributes like uri.username directly. Instead, use the set
method to create a new URL with the updated username (and password, if needed).
For example:
```python
def DB_CONNECTION_MUTATOR(uri, params, username, security_manager, source):
if username and source is QuerySource.SQL_LAB:
user = security_manager.find_user(username=username)
else:
user = security_manager.current_user
if user:
uri = uri.set(username=user.username, password="password")
return uri, params
```
This approach works because the set method returns a new URL object with
your changes, which is the pattern used in Superset's own codebase as well
([example](https://github.com/apache/superset/blob/master/superset/db_engine_specs/starrocks.py)).
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