Deleting document(s) inside a collection with documentReference - flutter

Question

I have a collection in firebase called "community" and "events".
When an event document is created, a field "communityRef" is included as docRef to community.
I'm trying to figure a code that when a community is deleted, all events related to the community are also deleted.
building this in flutterflow using custom action
onTap on a button in UI, the code is included as one of the actions before community document is deleted.
Future deleteAllRefEvents(DocumentReference community) async {
final instance = FirebaseFirestore.instance;
final batch = instance.batch();
var collection = instance.collection('events');
var snapshots = await collection.where('communityRef', isEqualTo: DocumentReference).get();
for (var doc in snapshots.docs) {
batch.delete(doc.reference);
}
await batch.commit();
}

Answer 1

You are passing DocumentReference type instead of variable community
Your code should be as following
Future deleteAllRefEvents(DocumentReference community) async {
final instance = FirebaseFirestore.instance;
final batch = instance.batch();
var collection = instance.collection('events');
var snapshots = await collection.where('communityRef', isEqualTo: community).get();//Here you used DocumentReference instead of community
for (var doc in snapshots.docs) {
batch.delete(doc.reference);
}
await batch.commit();
}