How to get the List of Document Reference from a Snapshot Document resulting from a Firestore query - flutter

Question

I can't seem to figure out how to get a List after querying a specific Firestore collection.
I want the function to:
Query the 'chat' collection on the field 'users'.
Retrieve only the document (should be only one but could be an error and there's more than one) where users, which is a LIST of Document Reference, matches two specific references: chatUserRef and authUserRef
The function should return a list of the Document References referring to this chat collection
This is what I am trying:
import 'package:cloud_firestore/cloud_firestore.dart';
Future<List<ChatsRecord>> getChatDoc(
DocumentReference chatUserRef,
DocumentReference authUserRef,
) async {
// Add your function code here!
final firestore =
FirebaseFirestore.instance; // Get a reference to the Firestore database
final collectionRef =
firestore.collection('chats'); // Get a reference to the collection
final filteredDocuments = collectionRef.where('users', isEqualTo: [
authUserRef,
chatUserRef
]); // Use the `where` method to filter the list of documents
final queryDocuments = await filteredDocuments
.get(); // You can then use the get method on this Query object to retrieve the list of documents AS a Snapshot Document (this is NOT a list of the Documents themselves).
List<ChatsRecord> listChatDocs = [];
// Cast the Snapshot Documents to a map
// Extract the Document Reference ID
// cast the query document to a map for e
// (should I forEach?)
List<ChatsRecord> listChatDocs = queryDocuments.docs.map((e) {
return FirebaseFirestore.instance.doc('chats/$e.id');
}).toList();
return listChatDocs;
}

Answer 1

Try using the arrayContainsAny instead of EqualTo in your where clause.
Like this:
final filteredDocuments = collectionRef.where('users', arrayContainsAny: [
authUserRef,
chatUserRef
]);