Event Listener¶

Event listeners are crucial for tracking changes to SQLAlchemy models. They allow the application to respond to changes in the database by recording them in history.

Creating an Event Listener¶

To create an event listener, you need to define it in the same module as the model and listen for the "after_update" event.

Example¶

@event.listens_for(Note, "after_update")
def create_note_history(mapper: Mapper, connection: Connection, target: Note) -> None:
    # Implementation details