Flutter Delete Field in Array in Firebase Firestore

Question

After getting the same data, I want to delete a specific field in the Array inside a document

[Execution][2][2]: https://i.stack.imgur.com/Ir687.jpg

my code

deleteItemToCart(String? foodItemId, BuildContext context, int quantity)
{
  String itemID = foodItemId!+ ":$quantity";
  FirebaseFirestore.instance
      .collection("users")
      .doc(firebaseAuth.currentUser!.uid)
      .update({
    'userCart.$itemID' : FieldValue.delete(),
  }).then((value)
  {
    Fluttertoast.showToast(msg: "Item Added Successfully.");

    print("ItemID " + itemID);

    //update the badge
    Provider.of<CartItemCounter>(context, listen: false).displayCartListItemsNumber();
  });
}

Answer 1

To delete an item from an array, you'll want to use FieldValue.arrayRemove operator as shown in the documentation on updating elements in an array .

If I have if correctly, that'd be:

.update({
  'userCart' : FieldValue.arrayRemove([itemID]),
})