How to pull snapshot key & values into list through Map<>? - firebase

Question

I've been following the official Firebase tutorial for using a real-time database: https://www.youtube.com/watch?v=sXBJZD0fBa4
I am able to pull all the data from the firebase real-time database. However, the method below to do so, provides a list of the data, with no reference to the parent keys (snapshot.key). An ideal scenario would be to have a key property within the Item class (item.key), so I can call upon it directly from the list.
class DatabaseModel {
final itemsRef = FirebaseDatabase.instance.ref().child('/Contents');
Stream<List<Items>> getItemssStream() {
final itemsStream = itemsRef.onValue;
final streamToPublish = itemsStream.map((event) {
final itemsMap = Map<String, dynamic>.from(event.snapshot.value as Map<String, dynamic>);
final itemsList = itemsMap.entries.map((element) {
return Items.fromRTDB(Map<String, dynamic>.from(element.value));
}).toList();
return itemsList;
});
return streamToPublish;
}
}
class Items{
final String item;
final String expiryDate;
final String quantity;
final String user;
Items({required this.item, required this.expiryDate, required this.quantity, required this.user});
//Mapping from real-time database
factory Items.fromRTDB(Map<String, dynamic> data) {
return Items(
item: data['item'],
expiryDate: data['exp'],
quantity: data['qty'],
user: data['user'],
);
}
}

Answer 1

In this code you only use the element.value of each node in your results:
return Items.fromRTDB(Map<String, dynamic>.from(element.value));
If you also want to get the key of each item, you will have to also use element.key in there and pass that to your Items object.
Something like this:
Items.fromRTDB(element.key, Map<String, dynamic>.from(element.value));
...
class Items{
final String key;
final String item;
final String expiryDate;
final String quantity;
final String user;
Items({required this.key, required this.item, required this.expiryDate, required this.quantity, required this.user});
//Mapping from real-time database
factory Items.fromRTDB(String key, Map<String, dynamic> data) {
return Items(
key: key,
item: data['item'],
expiryDate: data['exp'],
quantity: data['qty'],
user: data['user'],
);
}
}