Firestore - batch.add is not a function

Question

The documentation for Firestore batch writes lists only set(), update() and delete() as permitted operations.

Is there no way

Answer 1

Lets assume that you have list of cities and you want to write them in batch.

 final CityList = FirebaseFirestore.instance.collection('cities')
 WriteBatch batch = FirebaseFirestore.instance.batch();
 for(CityList city in cities) {
    final newShoppingItem = ShoppingList.doc();
    batch.set(newShoppingItem, {
  'name': city.name,
  'createdAt': DateTime
      .now()
      .millisecondsSinceEpoch
});
}
 batch.commit();