How to get the number of Firestore documents in flutter

Firebase doesn't officially give any function to retrieve the number of documents in a collection, instead you can get all the documents of the collection and get the length of it..

There are two ways:

1)

final int documents = await Firestore.instance.collection('products').snapshots().length;

This returns a value of int. But, if you don't use await, it returns a Future.

2)

final QuerySnapshot qSnap = await Firestore.instance.collection('products').getDocuments();
final int documents = qSnap.documents.length;

This returns a value of int.

However, these both methods gets all the documents in the collection and counts it.

Thank you

It Should Be - Firestore.instance.collection('products').snapshots().length.toString();

First, you have to get all the documents from that collection, then you can get the length of all the documents by document List. The below could should get the job done.

Firestore.instance.collection('products').getDocuments.then((myDocuments){
 print("${myDocuments.documents.length}");
});

 Future getCount({String id}) async => FirebaseFirestore.instance
      .collection(collection) //your collectionref
      .where('deleted', isEqualTo: false)
      .get()
      .then((value) {
    var count = 0;
    count = value.docs.length;

    return count;
  });

this is in dart language...

Since you are waiting on a future, this must be place within an async function

QuerySnapshot productCollection = await 
Firestore.instance.collection('products').get();
int productCount = productCollection.size();

Amount of documents in the collection

Future<int> getCount() async {
    int count = await FirebaseFirestore.instance
        .collection('collection')
        .get()
        .then((value) => value.size);
    return count;
  }

Above suggestions will cause the client to download all of the documents in the collection to get the count. As a workaround, if your write operations are not frequently happening, you can put the length of the documents to firebase remote config and change it whenever you add/delete documents from the Firestore collection. Then you can fetch the length from firebase remote configs when you need it.

Firestore.instance
    .collection("products")
    .get()
    .then((QuerySnapshot querySnapshot) {
  print(querySnapshot.docs.length);
});