How to convert map into array to firestore? flutter - flutter

Question

I have a users id I want to add it to firestore, like this
['GEcuHm3ICpWlEzfq1Z2tAjI2LII3', 'GEcuHm3ICpWlEzfq1Z2tAjI2LII3' ...]
I tried multiple ways but it didn't work
List membersListUid = [];
Future createGroup() async{
GroupRoomModel newGroup = GroupRoomModel(
groupName: groupName.text,
groupRoomId: uuid.v1(),
owner: userModel.uid,
membersList: controller.membersList,
membersListUid: controller.membersListUid.cast() // <---
);
}
...
Future createGroupFunc() async{
GroupRoomModel newGroup = GroupRoomModel(
groupName: groupName.text,
groupRoomId: uuid.v1(),
owner: userModel.uid,
membersList: controller.membersList,
membersListUid: controller.membersListUid.map((e)=> e).toList() //<---
);
...
Maybe this helps to understand the code
//Controller class
Map<String, dynamic>? userMap;
onSearch() async {
await _fireStore
.collection('users')
.where("email", isEqualTo: searchedMembers.text)
.get()
.then((value) {
userMap = value.docs[0].data();
});
update();
}
membersListUid.add({
"uid": userMap!['uid']
});
It's still gives me map within array.

Answer 1

THE PROBLEM:
membersListUid is a List of Maps. That is why you get an array of Maps in your database.
You need to get the actual value of the uid from each Map by using the uid key to get the value from the map.
THE SOLUTION:
Update this line:
membersListUid: controller.membersListUid.map((e)=> e).toList()
to this below:
controller.membersListUid.map((e)=> (e as Map<String, dynamic>)['uid']).toList()