how to send list<dynamic> to flutter firestore - flutter

Question

I have marge one list (test1) with other list (test2) and got list dynamic (marge1), I need to convert marge1 to Map<String, dynamic> to send it to firestore, so far I understand. But I became stuck. What will be the solution. My code are as follows:
margeFunction() {
List test1 = [
{
"id": 0,
"name": customerName,
"address": customerAddress,
"mobile": customerMobile,
"deliveryDate": selectedDate1,
},
];
test1.forEach((element) {
test2.forEach((e) {
if (e["id"] == element["id"]) {
marge1.add(getmarge1(
e["id"],
e["itemName"],
e["description"],
e["itemPrice"],
e["image"],
e["unit"],
e["selectedServiceInList"],
e["uniqueListItem"],
e["subTotalListItem"],
e["counter"],
element["name"],
element["address"],
element["mobile"],
element["deliveryDate"],
));
}
});
});
}
Map<String, dynamic> getmarge1(
int id,
String itemName,
String description,
String itemPrice,
String image,
String unit,
String selectedServiceInList,
String uniqueListItem,
int subTotalListItem,
int counter,
String name,
String address,
String mobile,
DateTime deliveryDate) {
final Map<String, dynamic> data = new Map<String, dynamic>();
data["id"] = id;
data["itemName"] = itemName.toString();
data["description"] = description.toString();
data["itemPrice"] = itemPrice.toString();
data["image"] = image.toString();
data["unit"] = unit.toString();
data["selectedServiceInList"] = selectedServiceInList.toString();
data["uniqueListItem"] = uniqueListItem.toString();
data["subTotalListItem"] = subTotalListItem.toString();
data["counter"] = counter.toString();
data["name"] = name.toString();
data["address"] = address.toString();
data["mobile"] = mobile.toString();
data["deliveryDate"] = deliveryDate.toString();
return data;
}
Now I need to send the merge1 list to firestore. I have tried but can't figured it out. Any help is appreciated.

Answer 1

marge1 is a List<Map<String, dynamic>> and you'll want to write each of the Map<String, dynamic> item and not convert the list itself to a Map<String, dynamic>.
You will need to use a batched write.
Batched Writes: a batched write is a set of write operations on one or
more documents.
Source
You can do that as shown below:
final FirebaseFirestore firebaseFirestore = FirebaseFirestore.instance;
final WriteBatch writeBatch = firebaseFirestore.batch();
final CollectionReference collectionReference = firebaseFirestore.collection("collectionPath");
marge1.forEach((element) {
final DocumentReference documentReference = collectionReference.doc();
writeBatch.set(documentReference, element);
});
writeBatch.commit();
Checkout FlutterFire's BatchedWrite documentation