retrieve data from firestore with flutter

Question

I wanted to retrieve data from firestore to flutter app. I have a lot of data. So I don't wanted to all the data at once. I wanted to get first 10 documents at once and when press load more, it should give another 10 documents so on. I tried this way.

var myWhishlist;
late QuerySnapshot snap;
late CollectionReference userDoc;
retrieve() async {
  userDoc = FirebaseFirestore.instance
      .collection('user/' + Uid + "/myItems");
  snap = await userDoc.where('isPaid', isEqualTo: false).limit(10).get();
  myWhishlist = snap.docs.map((e) => e.id).toList();
}

In this way I got first 10 documents. How to get next 10 documents? IS there any method available to get like this? Can Some one help me?

Thanks in advance.

Huthaifa Muayyad · Accepted Answer · 2021-08-21 16:03:21Z

1

What you are doing for now is correct, your code will limit the results to 10. If you want more results, you can use or startAfterDocument and pass the document of the last document retrieved from your previous fetch.

I would suggest creating a standalone method, which is

Future<QuerySnapshot> example (DocumentSnapshot? document) async {...etc}

If you don't pass a string to it, run your ordinary query using limit. If a string is passed, use the startAfterDocument flag.

snap = await userDoc.where('isPaid', isEqualTo: false).limit(10).startAfterDocument(documentSnapshot).get();

edited Aug 21, 2021 at 16:03

answered Aug 21, 2021 at 15:19

Huthaifa Muayyad

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2 Comments

Ragawender Sivanraj Over a year ago

startAt expect a list as input. When I try to pass document Id it show need to add list as input.

Huthaifa Muayyad Over a year ago

I edited my answer, use startAfterDocument.

Mozes Ong · Accepted Answer · 2021-08-21 15:19:39Z

1

take a look at paginate_firestore package https://pub.dev/packages/paginate_firestore

answered Aug 21, 2021 at 15:19

Mozes Ong

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