Flutter 使用 firestore 弹出屏幕 stream 重新阅读文档

Question

I am fairly new on flutter and firebase, i am currently developing app which have a streambuilder with stream from a firestore snapshot, the statefulwidget class is more or less like this:

StreamBuilder(
 stream: ItemService().getItemsWithStatus([1]),
  builder: (context, AsyncSnapshot<List<Item>> snapshot) {
     //Widget to show information
                                 
     }
  )

and i get the stream from itemService class like this

class ItemService{
Stream<List<Item>> getItemsWithStatus(List<int> status) {
    return _firestore
        .collection(itemsPath)
        .where('status', whereIn: status)
        .snapshots()
        .map((QuerySnapshot snapshot) => snapshot.docs
            .map((DocumentSnapshot document) => Item.fromDb(document.data()))
            .toList());
  }
}

the question is, when i close the screen with that streambuilder and then reopen it would it read the data again from firestore (and doubling my read count)? if yes then how can i possibly do to avoid reread?

Thankyou, any advice will really be appreciated

Answer 1

Probably no. You can check with this alteration:

(DocumentSnapshot document) {
  print(document.metadata.isFromCache);
  Item.fromDb(document.data());
}