Removing a listener from firestorm
In react, if you attach a listener for realtime updates when a component mounts, you'd need to remove it when the component amounts.
Failing to do so could raise an error if you delete that item and there's a listener that is still associated with it.
let unsub = db.collection('cities').onSnapshot(() => {
});
// ...
// Stop listening for changes
unsub();
if using React hooks, you use
useEffect and return a function to do the clean up. See the React docs for more details on the equivalent syntax to componentWillUnmount
https://reactjs.org/docs/hooks-effect.html#example-using-hooks-1TODO: Add code example
Last modified 3yr ago