Flutter、Firestoreで500件以上のbatch処理

Flutter、Firestoreで500件以上のbatch処理

結果

Future deletePostsOfCurrentUser(User? currentUser) async {
    await FirebaseFirestore.instance
    .collection('posts')
    .where('uid',isEqualTo: currentUser!.uid)
    .get()
    .then((qshot) {
      WriteBatch batch = FirebaseFirestore.instance.batch();
      final docs = qshot.docs;
      int index = 0;
      docs.forEach((DocumentSnapshot doc) async {
        if ((index + 1) % 500 == 0) {
          // commit by 500 and initialize batch instance
          await batch.commit();
          batch = FirebaseFirestore.instance.batch();
        }
        batch.delete(doc.reference);
        index++;
      });
      // last commit
      return batch.commit();
    });
  }